Evidence Based Dentistry--Question, literature, LOE (level 1 only—based on expertise and pts preference)

Chong, Lindenboom—IRM and MTA same for prognosis

Rud Andreasen 1972—histo (success, failure (inflammation) and scar (success)) and radio (complete, incomplete (scar), uncertain (reduced radiolucency w/ no symptoms) or failure) classification of success/failure for retreatment, Molven is similar with pictorial representation (Orstavik PAI not apply to surgical retx)

Allison—lat con spreader to within 1 mm

Ove Peters—CBCT to study RC morphology

Engstrom—healing/non-healing can be determined by 4 years

Inflammatory root resorption—inflammatory cells present, prostaglandins, cytokines

Replacement resorption—giant cells, no inflammatory cells

Fabricius—talked about bacterial composition (aerobic vs anaerobic, anaerobic more in necrotic)

Sundquist—synergestic effects of bacteria

Sjogren IEJ 1991—CaOH seven days in canal for efficient elimination of bacteria

Peters and Wesselink 2002—Paper pt using for CaOH app, drying it out, but CaOH not beneficial

Rickert and Dixon 1941—hollow tube theory (stagnation of fluid causes infl), false—non-sterile

Morse –electrophoresis to determine cysts—RCT successful treated

Ingle 1969—standardized instruments into ISO

Weine’s classification, IOUY, mechanical shaping (final shape should encompass original shape), stepback technique

Langeland—1967, instrument to apical constriction tactile, no standard mm measurement

Overfilling is overinstrumentation (transp of canal), no seal

Strindberg 1956, first to classify heal/fail, healed (PDL normal, lamina dura intact), partial (scar), nonhealing (same RL) fail (larger RL or non resolution)

Hoshino 1990-E. faecalis invasion into dentinal tubules

Langeland—accessory canals don’t cause lesions, just portal of entry

Siquiera IEJ 2003—infection most significant factor in flare up pathogenesis

Morse—should put on Ab’s if necrotic w/ PAP, most others say no Ab’s (won’t help with pain)

Hasselgren—pulpotomy only is nec for vital pulp emergency, calcified canals don’t need RCT if asympto

O’Keefe—pain before tx makes 5X more likely to exp pain after treatment

Schneider—if local corticosteroids used, use systemic antibiotics to prevent infection from invasion

ADA Spec 28—dictated torsional resistance and bending force

Dalton—rotary and hand instruments same for microbiological debridement

Delivanis—bacteria study, entomb the bacteria, starve them and they’ll die

Andreasen—never do RCT on day of trauma, mendicaments cytotoxic to PDL at periapex

Sjogren—GP no unfavorable reaction, set sealer not toxic

ADA standard 28: 35, 45, 60 degrees to test rotary files

Orstavik—E faecalis penetrate 250 microns into tubules, Haapasalo—300-400 microns

Harrison—looked at concentrations of NaOCl, recommends 5.25%

Sjogren and Bystrom showed much higher success if no bacteria

Muller—iodine/H2O2 protocol for disinfecting rubber dam

Sundquist—anaerobic sampling of bacteria

Spangberg—0.5% NaOCl to limit accidents

Smith/Weller GP flow 2-3 mm when heated

Molven Hulsmann and Fristad (sp?)—(Fristad is the radiologist)

Molven has nonsurgical and surgical (surgical has the addition of scar tissue formation—incomplete healing) nonsurgical healing is favorable, uncertain, and unfavorable

Chen, Sahlerabi, Lazarski—survival studies (insurance data) 93%+

Torebinejad study that GP leaks at 30 days w/ complete bacterial penetration to apex

Cross-sectional studies of endo success—Buckley, Spangberg, Kirkevang

Nair shows extraradicular infections (actinomycosis)

Summary of Lit Review

Reit CDahlen G

U of Goteborg, Sweden

An in vivo human study showing:Treatment of teeth with apical periodontitis should be done with 2 appointments with interappointment Ca(OH)2 dressing.  If bacteriological testing techniques improve, can make individualized treatment strategies for each case.

Critique:

% They retested canals after no intracanal medicament, so any bacteria present in very minute numbers could have multiplied. The sensitivity and specificity of the bacteriological test was not as high as desirable.

Stabholz AFriedman S

Hebrew U Jerusalem, Isreal

A review article suggest guidelines for treatment planning for endodontic retreatment, involving two levels of treatment: GAINING ACCESS TO THE ROOT CANALS (to remove the crown or not) and GAINING ACCESS TO THE APICAL FORAMINA (bypass post).

Hayes SJDummer PMH

U of Wales, Cardiff, UK

A single case report of late RCT failure 17 years s/p NSRCT for which SRCT was the performed retreatment.  Coronal leakage was identified as a possible point of failure.

Reit CKvist T

U of Goteborg, Sweden

The study shows that a practitioners values influence their treatment choice for root canal retreatment cases.  The manifestations of these values varied substantially among individuals.Because of this, the consumer must be more involved in the decision-making process. 

Hamilton RSGutmann JL

Texas A&M

Baylor

Literature review showing:Orthodontic movement can affect vitality, teeth with prior RCT show less resoroption than vital teeth, RCT teeth can be moved as well as vital teeth, traumatized teeth can be moved, little is known about moving SRCT teeth,

Matosian Dental professionals must recognize the fact that the preservation of debilitated natural teeth, no matter how "noble" a concept, may offer patients a poorer prognosis than the early removal of such teeth and their pre-emptive replacement with a dental implant.  Treatment planning paradigms need to be updated

Pitt Ford TRRhodes JS

London, England

Article discussing reasons for failure and treatment options.% Failure of RCT: Biological (no rubber dam, incorrect irrigants, prepared short, missed canals, poor obturation) and Other (root fracture, poor coronal restoration, resistant bacteria,

economic constraints).% Assessment of Success and Failure: Success defined as relief from symptoms, healing of sinus tract, and reduction or resolution of periapical radiolucency.

include Review, RCReTx, Root end surgery, or Extraction.% Factors that may affect outcome: Periapical radiolucency, Size of radiolucency, Technical difficulty of retreatment, and Perforations.

Treatment Planning: If one can improve upon existing RCT and cause minimal harm, then retreatment should be considered.

Cho GUSC

2004 Review of literature regarding extensively damaged teeth with heavy implant bias.

Torabinejad MGoodacre CJ

Loma Linda

2006 A review paper addressing systemic and local health, pt comfort and perception, pulpal and periodontal status, biologic and environment, color characteristics, soft tissue biotypes, procedural complications, adjunctive procedures, treatment outcomes (success rates).

 

Pulpal Pathology

Bender Seltzer 1963 OOO, pulpal pathology varying degrees, previous pain best indicator

Michaelson/Holland IEJ 2002, painless pulpitis 40% of teeth, esp older pts

Stashenko—1998 oral Biol Med—PMN’s first, monocytes, excavate PA bone to make room for inflammatory mediators

Jontell—1998 Oral Biol Med-Dendritic cells-antigen presenting cells inside pulp vs caries/macrophages, initiate response

Hargreaves/Goodis—2006 JDR—Low temp decrease pain (CGRP) low pH increase pain (CGRP)

Kamal 1997 JOE—Pulp reacts early to caries, lay down reparative dentin, closer caries got, more rxn

Massler IDJ 1967—active and arrested carious lesion, acidogenic, proteolytic phases (indirect)

Lundy 1969 OOO—pulpal response to mechanical insult, repairs itself.

Reeve Stanley OOO 1966—reparative dentin is pathologic and is leaky (0.5 mm to pulp causes infla)

Van Hassel and Harrington OOO 1969 Localizing EPT between teeth, about 80% Max/Ant better

Bender OOO 1995—pulp diagnosis classification by pain (mild—treatable conserv, severe—RCT)

Bender AEJ 2000—prev hx of pain, irreversible, mild w/o prev pain: reversible

Abbott and Yu 2007 AEJ—classif based on symptoms, remove restorations

Peters JOE 1994—If cold and EPT tests both negative, very likely necrotic, cold is enough in 20-50 yrs

Iqbal JOE 2007—sharp-pulp, dull-PDL, caries—symptomatic, pulp pain more likely to Ex care

Friend OOO 1968—EPT test to localize, max and ant more accurate, overall hard to localize 40-60%

Levin et al 2008 Consensus conference, similar to Abbott 2007

Ca(OH)2

Tronstad JOE 1981—CaOH makes dentin more alkaline, promotes repair and inhibits infl resorption

Evans IEJ 2002—E. faecalis resistan to CaOH, ppi make less resistant, not built up resist to NaOCl or stress proteins

Zerella OOOOE 2005—CHX and CaOH in retreat is better for E. faecalis and same for others as H20

Hasselgren JOE 1988—CaOH can dissolve tissue on its own, and increase eff of NaOCl in 2nd visit

Safavi JOE 1993—CaOH breaks down LPS (endotoxins) and inactivates them in vitro

Haapasalo IEJ 2000—dentin powder inhibit effects of CaOH and somewhat CHX and NaOCl

Kvist JOE 2004—1 visit with 5%IPI is similar in bac redux to 2 visit CaOH (no NaOCl in 2nd)

Sathorn IEJ 2007—Meta-analysis shows CaOH has little effect between visits

Periapical Path

Torneck OOO 1966—sterile, closed end tube, .25-.5mm ingrowth of CT, so sterile RCT should heal destroyed Rickert and Dixon hollow tube theory

Lalonde, Luebke OOO 1968—cyst: granuloma 50/50, not accurate, not enough sections, curetted

Nair OOO 1996—cysts only 15%, more sections, in toto, TEM, 2 types of cysts, true and pocket

Torebinejad Oral Surg 1978—immune causes of PA lesions—complement, antibodies, etc, flare up immunological in nature

Ricucci Endo Topics 2004—Histologic cases, epithelium cells—protective mechanism

Valderhaug IJ Oral Surg 1974—Monkeys, cysts developed within a year, labeled epith proliferate

Jansson Swed D Jour 1993—monkeys, sealed (anaerobic) infected teeth dev path faster than unsealed infected(aerobic)

Svensater Endo Topics 2004—biofilms create sp environment for bacs, nutrients, attachment, and antibiotic resistance.

Stashenko JDR 1989—T-helper in early lesion, T-suppressor in later lesion (to control lesion size)

Periapical diagnosis

Ricucci and Langeland IEJ 1998—Review, part 1, part 2, instr to constr best, 2 mm short of const is next best, long is worst, vital pulp stump okay, helps healing, don’t follow mm by itself, tactile

Kovacevic AEJ 2008—pulp histology correlation with AP, bone resorption as early as pulpitis

Ariji IJOMS 2002—Submandibular abscess, cause trismus/dysphagia. 3rd molars very common, may be periocoronitis, not endodontic, bad symptoms assoc with parapharyngeal

Seltzer JOE 2004—Inflammation greater in overinstrumentation

Teodorou 2003—non-odontogenic tumors overview, inc bone, CT, vascular, cartilage, carcinoma, etc.

Torneck OOO 1969—inflammation induces cementum and dentin and recontouring, bone resorption on one side and deposition on side away from lesion (compensatory mechanism) used tetracycline

Nair and Sundqvist OOOOE 2008—abscess pathway of cyst formation, rat experiment

Current Lit

Chivatxaranukal 2008—E. faecalis penet into tubules (esp unprepared), greater adher to collagen

Degerness JOE 2008—lateral canals and isthmus majority in apical 3-4 mm, resect to this level

Lindemann JOE 1986—triazolam did not increase anesthetic success in IAN block

Rania AEJ 2008—pulp stem cells used to produce pulp-like tissue in rabbits, long way off in humans

Tsesis JOE 2008—8.4% flare up incidence in meta-analysis, many others show lower but were excluded due to different definitions of flare-ups, more stringent

Wiegand DT 2008—Emdogain (Iqbal and Lam) reduces repl resorption, NaF not helpful (review)

Witherspoon JOE 2008—MTA apexification has more adv that CaOH2 and can be done in one visit with same success as two visits

Tsukiboshi 2008—photos, digital radios, and CT helpful in dental trauma

Endodontic Emergencies

Weathers 1992—Profit from emergency endo, fast and slick, schedule time for emerg

Weine OOO 1975—close vital teeth between appt, No kidding!

August JOE 1982—should close abscessed teeth between appt (prev left open by another dentist) 95% success

Houck OOOOE 2000—Trephination not helpful for prevent post-op pain (same w/ or w/o)

Hasselgren 1989—pulpotomy sufficient to remove pain (after 1 day), mendicament type doesn’t matter

Negm 2001—corticosteroids intracanal to prevent post op pain should be done, Ab’s to prevent infection

Grossman 1977—endo emer not just toothaches, fx’d tooth, fx’d bone, post-op pain

Halvorson JEM 1985—I&D for abscess if fluctuant, blunt dissection etc

Matthews CDA 2008—AAA’s should be drained through canal or by I&D, Ab’s only for systemic probs or immunocompromised

Carrotte 2004—Ex’s before, during, and after

Gatewood 1990—AAE survey, times change, especially one visit and complete cleaning and shaping

Compromised teeth

White 2006—Can’t compare implant survival vs endo success, implants more intensive in planning/execution

Kim/Iqbal 2007—Systematic review, equivalent success, decision should be based on individuals

Kim/Iqbal 2007—no diff in long-term prog (cheaper and quicker—endo), implants great if endo prognosis is poor

Doyle 2007—smoking affects endo, overfill more failures, no diff in # of appts

Mordohai 2007—implants much better than endo, obvious bias with selective literature use

Allen 2004—endo for elderly—better than implants, less trauma, can’t tolerate removable prosthesis

Yeng 2007—treatment planning essential (restorable? Etc) refer if best for patient, communicate with referring doc

Gorni/Gagliani 2003—retreatment success much higher if root canal anatomy not violated (86 vs 48%)

Anesthetizing pulpitis

Byers 1993—pulp tissue less able to recover after exposure if lacking innervation (dental injury models)

Claffey 2004—septocaine and lidocaine no difference in IAN success (both low—25%)

Clark 1999—mylohyoid nerve block does not provide numb by itself, does not enhance IAN

Gallatin 2000—corticosteroid reduce post-op pain vs saline

Hargreaves 2002—inflamed tissue harder to anesthetize, tachyphylaxis (repeated doses less effective)

Nusstein 2003—benzocaine topical only effective in max anterior—other areas no difference from no benzo

Nusstein 2003—X-tip intraosseous successful at profound anesthesia when IAN fails, only if no backflow

Van Gheluwe 1997—PDL effective if have backpressure, saline and anesthetic equally effective

Walton 1986—PDL is actually intraosseous injection, no tissue damage adjacent teeth anesthetized

Instrumentation mechanics

Felt 1982—reamers have fewer flutes, more vertical, more efficient, more clearing of debris

Miserendino 1985—cutting tips more efficient than flutes, can transport more easily

Bahcall 2000—NiTi instruments not twisted, more effective than hand instrumentation

Kazemi 1996—NiTi instruments more efficient than stainless steel

Roane 1985—Balanced force technique—placement (pressure clockwise screw in), cutting (pressure counter-clock), and debris removal (non pressure clockwise)

Rowan 1986—torsional failure same for SS and NiTi, clockwise more torque than counterclockwise

Guppy 2000—no positive rake angles, no lube was used, Profiles produced smaller chips (more negative angle)

Schafer 2001—rhomb/triang most flexible (depends on cross-section--lower surface area), triangle least likely to fx

Buckley 1995—PAP more in mx than md, ant than molars, overfill/short root-filled more likely, root-filled 12 times more likely to have PAP

Molven 2002—long-term followup 10-17 years, 83% agreement between self and other examiners of PAP, good?

Peters 2002—microbes grow between visits, no benefit to CaOH between visits, do one visit (CaOH dried)

Dental Trauma—Diagnosis

Andreasen Text Book chapter—complete clinical and radiological of teeth and soft tissue

Andreasen 1995—avulsed teeth high risk of need for RCT, 34% heal if have open apex, 1/3 PDL heal

Andreasen 1986—transient apical breakdown—4% of luxations have it, most of these have color changes also, most are mature permanent teeth, blunting of apices and pulp canal obliteration

Feliciano 2006—54 different trauma classifications exist, Ellis simplified by number, Andreasen soft tissue as well

Haas 2008—PDL loss after trauma, greater in extracted than trauma intrusion lost more apical, extracted in cervical

Hammarstrom 1986—avulsed teeth 2 hrs in saliva, 6 hrs in milk, if dry, after one hour, scrape tooth clean before

Hammarstrom 1996—Ab tx in avulsed teeth, early (not late) systemic Ab and early endo tx prevent root resorption

Cvek 1978—partial pulpotomy w/CaOH 96% success (normal, healthy), size and interval of tx no difference

Bjorndal 1998—stepwise excavation 94% success, save many more teeth

Trauma Treatment

Goldberg 1984—CaOH2 makes dentin bridge, porous, leaky, irregular from dye and SEM studies, need restoration

Pitt Ford 1996—MTA as pulp cap material—makes thicker bridge, prevents microleakage, more biocompatible

Andreasen 2004—horizontal root fx, less developed roots(more blood supply)—better healing, less displacement, more healing, rigid splinting, less circ poorer healing, repositioning have sig effect on healing if less than 1 mm

Cvek 2002—cervical root fx, good prognosis, oblique better than transverse

AAE Guidelines—take radiographs, follow up, check chart

Flores 2007—splint most 7-10 days, systemic antibiotics/ tetanus

Cvek 2004—horiz root fx, no RCT unless necrotic, only fill coronal part, higher success if apexification of coronal seg first, then fill coronal part

Flores 2007

Cleaning and Shaping

Kerekes 1979—Success of Ingle’s standardized instruments—91%, PARL present significantly lower success, first study to look at results of standardized instruments, first study to get >90%

Bergenholtz 1979—overinstrumented/overfilled retreated cases, more pap found in overfill cases (result of zip perf because of overinstrumentation, not bacteria extruded from canal.) lower success than RCT (62% w/o overfills)

Goerig 1982—step-down technique—coronal flaring first (Hedstrom and GG) wiped in anticurvature, then make apical stop 1 mm short and step back to flare.

Morgan 1984—crown-down technique (pressureless) provided better preparations than circumferential

Pruett 1997—cyclic fatigue—used radius and angle to measure curvature. Sharper curves, less cycles to failure, angles greater than 30 cycles to failure decreased, not affected by RPM, larger files less cycles to failure. (40>30)

Hinrichs 1998—no significant difference in debris extrusion between different rotary files (except in apical), amount of debris correlated to amount of irrigation.

Pettiette 1999—niti hand vs ss hand—niti less deviation (4.4 vs 14.4 degrees), also fewer strip perfs

Kirkevang 2002—longitudinal studies best, good quality makes a difference for healing (PAI)

Usman 2004—apical cleanliness det by instrument size, not length (40 better than 20), histological model

Patino 2005—rotarys--# of times used best indicator of breakage, (no visible sign) (greater curve, more breakage)

Barroso 2005—coronal flaring enables better IAF determination

NiTi instrumentation

Klevant IEJ 1983—leaving bacteria-free canals unfilled caused same healing rate as bacteria-free filled canals (percolation may not exist)

Dalton JOE 1998—no diff in bact reduc between NiTi and SSK, bigger sizes better, sig reduc after filing

Trope 1999—1visit vs 2, no difference statistically, but 2 visit cleans more bacteria, clinically significant

Card JOE 2002—larger apical sizes can remove almost all bacteria, 1 visit more viable option (w/ irrigation)

Portenier IEJ 1999—LightSpeed causes less displacement of center of root canals (flex shape, noncutting shaft)

Versumer IEJ 2002—LS vs ProFile, no difference in safety or shape, ProFile fewer instr and faster

Iqbal JOE 2007—no diff in safety between LS1 or LSX, (LSX more efficient)

Peters INJ 2001—NiTi instruments still leave 35% of canal surface uninstrumented (by uCT scanning)

Shen JOE 2008—cutting efficiency better with irrigation, similar between instruments

Parashos JOE 2006—fx instrument should be removed only if able w/o excessive dentin removal

Irrigation

Sen 1999—Candida resistant to NaOCl when in biofilm on canal walls. Use antifungal if predisposed to candida.

Rasimick 2008—interaction of EDTA and CHX, ppt, but no carcinogen (like w/naocl and CHX) and little degradation

Khademi 2006—30/.06 effective for debris and smear layer removal. Poor study design., SEM

Peters 2000—LS vs ProFile in debris removal—LS better because larger size, design doesn’t matter, water similar to naocl and EDTA, SEM

Hulsmann 1999—Careful with NaOCl, treat w/antibiotics and compresses

Baumgartner 1984—NaOCl better at removal of debris, citric acid better at removing smear layer, SEM

Van der Sluis 2007—NaOCl with ultrasonication better than passive NaOCl better than water (removal of CaOH from artificial groove)

Zehnder 2006—overview of irrigants

Root canal antiseptics

Law 2004—meta-analysis—CaOH2 reduces bacteria as medicament, may not have opened far enough

Messer 1984—CMCP (chlorophenol) 90% lost after 24 hours, may not be effective as intracanal medicament

Molander 1999—CaOH2 does not work better if left in canal longer than 7-10 days, IPI doesn’t increase antibacterial effect, but may be more effective against E. faecalis.

Orstavik 1990—Smear layer delayed (but not abolished) med effects, CMCP and CaOH2 both effective (CMCP more vs E. faecalis), IKI better than NaOCl better than CHX, dentin acts as buffer

Shabahang 2003—MTAD more antimicrobial effectiveness vs NaOCl (use less of NaOCl, no tissue dissolve by MTAD)

Portenier 2006—CHX same as MTAD for E. faecalis, dentin powder buffered, delayed effect

Siren 2004—IKI or CHX w/CaOH2 better than CaOH2 alone, CaOH2 least toxic.

Spangberg 1979—IKI is least toxic and with substantial antimicobial of irrigants at the time (NaOCl not in play), CMCP, cresols toxic.

Sealers—hermetic seal, biocompatible, bacteriostatic, resorbable, dimensional stability, easy to mix

Economides—smear layer removed improved quality of apical seal w/AH 26, no diff with Roth (flow leakage)

Barbizam—CaOH2 placed prior to obturation interferes with bonding of Epiphany (maybe not clinically sig)

Allan—Sealers set from 1-3 wks, (or longer) set more quickly on glass slab than in ext tooth

Kokkas 2004—smear layer blocks sealer from entering tubules

Nielsen 2006—Resilon doesn’t set well in aerobic environment (including periradicular tissues)

Saleh—AH plus and GS kill E. faecalis, other sealers don’t kill as well. (even into tubules)

Sari 2007—Extruded AH Plus does NOT prevent PA healing, but may delay it in children

Tay, Pashley 2006—resin sealer can’t hold to dentin as well as composite

Obturation materials

Schilder 1967—Warm vertical condensation produce 3-D filling,

Peng 2007—over-extension greater in warm GP vs cold lat, success equal

Smith, Weller 2000—Warm techniques better at filling canal irregularities, deeper heat better

Tunga 2006—resilon provides better seal than GP (but sealer not allowed to set w/ GP)

Biggs 2006—no difference between GP and Resilon for leakage and sealing ability

Shipper/Trope 2005—More inflammation (AP) with GP than with Resilon (coronal bacterial inoculation and leakage w/ GP)

Hsieh 2008—ZnO TPU new composite obturation material stronger than resilon or GP

Cotton 2008—Resilon and GP same in healing outcome

Endodontic Radiography

Goldman 1972—agreement between examiners less than 50% on interpret (not read) radiographs

Goldman 1974—agreement with self (2 yrs later) only about 80% of the time

Reit/Hollender 1983—very low agreement between examiners (PARLs and apical seal)—open to interpretation

Bender/Seltzer 1963—doesn’t show up on radiograph until cortex is eroded, trabecular pattern is from junction,

Barbat 1998—lamina dura disruption shows on the radiograph, not reaching cortex.

Woolhiser 2005—no difference in length determination accuracy between digital and film

Nair 2007—CCD is the best for contrast and resolution, CBCT for 3-d (For surgery prep)

Digital Radiology

Patel 2007—CBCT (Coneshaped beam, lower radiation) iCat can limit view to size of PA film, 7.5 units vs 5 for PA

Cohenca 2007—Trauma, CBCT better for fxs, may not be feasible. PA’s many views required (MRI for soft tissue)

Cohenca Part 2—root resorption, CBCT helpful in locating resorption to plan tx

Sogur 2007—CBCT vs digital vs film for det length and density of obt, digital better images than CBCT (Same as film)

Loushine 2001—calibrated digital software better for length determination than uncalibrated

Matherne 2008—find addt canals w/CBCT, digital, etc. CBCT better than 2-d methods for finding addtl canals

Fan 2008—Dig Subtraction Radiography—accurately determine canal anatomy—c-shaped canals

Simon 2006—evaluate cyst vs granuloma by CBCT, 13/17 correct, other 4 questionable

Apex Locators

Kakehashi 1965—no infection in germ-free mice with pulp exposure, present in control animals

Blank 1975—Old AL’s high current, 85% accuracy (w/in .2 mm), endometer vs sonoexplorer no stat difference

Trope 1985—AL need to use strict guidelines—get 90.6% accuracy to apical foramen (Subtract-0.5 mm to constr)

Shabahang 1996—Root zx 96% accuracy, but 30% beyond apex (still counted as accurate because w/in 0.5 mm)

Jenkins 2001—Root ZX reliablie w/in 0.3 mm, can work in any irrigant no stat difference

Tselnik 2005—Root zx and Elements AL—no difference, both accurate

Williams 2006—compared radiographic WL with actual length in extracted teeth—if file long, actually longer than appears, if file short, closer by 0.5 mm to foramen than it appears

Wilson 2006—AL and EPT safe for pacemakers/defibs? Safe for use, no interference, no abnormalities by EKG

Current Lit March 2009

Bashutski—GTR, memb and grafts Mainly used in endo surgery w/through and through lesions, perio-endo comm.

Gu—(Hsu, Weller, Kim for isthmus) highest isthmus from 4-6mm

Filho—MB2 in 53-67% of cases, CBCT helpful

Schirrmeister—microbes in PARLs of root-filled teeth (facultative anaerobes, many perio bugs) (gram negative—have LPS endotoxin) microbes in PARL if symptomatic (acute lesion)

Tawil—eval retrofill materials—composite if have long post (dome shape), MTA and IRM same histo, geristore less favorable histo, all same radiographically

Kuah—EDTA w/ultrasonication w/NaOCl flush gives best result for smear layer removal (1 min each)

Matthews—Articaine as buccal infiltration is 50% effective if IAN block fails (none or mild pain)

Yamane—biofilms in apical area in persistent PAP may contribute to failures of RCT (resistant to RCT) (gram-positive rods identified)

Vital Pulp Therapy

Leksell 1996—stepwise excavation—fewer pulp exposures w/stepwise. Also, after initial removal, easier to see demarcation between soft and hard dentin—CaOH2 dries out and disinfects carious dentin

Magnusson 1977—stepwise w/primary teeth, much lower pulp exposure—good for maintaining tooth until exfol

Jordon 1978—indirect pulp cap-50% resolved PARLs, PARLs may not indicate irreversible condition

IL-1 and TNF-beta—initiate osteoclasts to form resorption—these are activated by inflammation (not necessarily necrosis) in pulp. Once get bacteria into PA region, get PMNs and pus, now diff animal.

Caliskan 1995—full pulpotomy in vital teeth w/PAP—24/26 healed w/ only

Lim and Kirk 1987—review—older paper, original state of pulp and immunological capacity are important

Fitzgerald 1979—mech exposure—clot lysis, fibroblasts and endothelial cells move in, org and diff into odontoblasts. Odontoblasts form from fibroblasts. No mitosis in odontoblasts layer, but happening in fibroblasts showing they diff into odontoblasts.

Tziafas 2002—MTA shows hard tissue formation as pulp capping, two layered hard tissue barrier

Barthel 2000—carious exposure—pulp cap—poor long term prognosis 13-37%, (prolong vitality for apex closure)

Ultrasonics

Plotino 2007—review of ultrasonic’s—many uses refine, surgical, irrigation, instr removal, condense MTA

Van Der Sluis 2007—ultrasonic irrigation, NaOCl best, cavitation is mech, center of canal, non-cutting file

Lui 2007—EDTA vs +surfactants. No difference between them, ultrasonics w/EDTA is better than w/o

Min 1997—root end preps—some fx’d thin dentin walls w/ high power ultrasonic (more than low power or bur)

Ettrich 2007—water w/medium power best for keeping heat down during post removal

Huttula 2006—post-removal with irrigation results in lower heat in the PDL—safer

Vertical Root Fractures

Chan 1999—40% of VRFs occur in nonendo treated teeth, higher in molars than anteriors (for nonendo teeth)

Cohen 2006—pain found to be significant predictor, 40+ much more likely, radiograph not predictive

Pitts 1983—review paper, may be partial length of root, sx tx vs ext

Meister—84% of VRF due to condensation forces

Fuss 2001—VRFs—60% had posts, 40% w/o posts, crowns don’t prevent, Vrfs caused while prep and post placing

Lertchirakan 2003—small radius of curvature (sharper curvature), greater stress concentration

Trope 1992—glue 2 halves of tooth together(GI bone cement), 5 minutes out of socket, replanted after HBSS bath

Walton 1984—fxs make open pathway for irritants, 90% of fxs complete (full B-L dimension)

Stains-- Stained with H&E (soft and hard tissue), Brown and Brenn or McCallum’s (bacteria), and Wilder’s reticulum (granulation tissue)

Current Lit April 2009

Alves 2009—cryogenic DNA bacteria sampling to compare apical bacs to coronal bacs, high variability within tooth and between pts (same area of tooth), but some overlap from apical to coronal

Hammad 2009—voids in various obturation materials using uCT, GP has lowest gaps/voids, but resilon bonded

Kirakozova 2009—intracanal corticosteroids in replantation (dogs teeth) sig improve healing (high potency)

Martos 2009—major foramen average 0.69 mm from apex, deviated from center 60% of time

Chen 2009—DL roots in Taiwan (10%)—shorter than DB root (about 2 mm), extreme curvature of DL

Zadik 2009—barodontalgia—pain in scuba or flight—if pulpitis or necrosis, need to treat and fill empty space

Del Fabbro 2009—PA surgery post op, sulcular vs papilla based incision, PBI better for pain, swelling, and meds

Zehnder 2009—Review of enterococcus in rc system—not early invaders, may enter during or usually after tx from food

Root Resorption

Gartner 1976—Dx internal vs ext root resorption—Internal-smooth margins, attached to larger canal (can begin in crown), Ext—irregular border, smaller canal, detached from canal on angled radiograph

Fuss 2003—causes resorption—internal inflammatory w/ vital pulp, External--pulpal infection (apical) tx w/RCT, pressure (apical or midroot) remove pressure, perio infection (cervical) clean and restore, external can also be vital in the case of invasive cervical resorption

Frank 1987—cervical resorption not invading pulp, how to treat, locate surgically expose, CaOH2 over pulp, restore

Frank 1998—tx of ext invasive resorption—idiopathic, vital pulp. RCT before debridement in case of pulp exp

Smidt 2007— cerv resorption case--use of ortho extrusion plus surgical exposure, restoration and RCT to restore

Nikolidakis 2008—cerv resorption—usu asymp, idiopath, disc on x-ray. Case report, no RCT, just surg exp and rest

De Souza 2009—ortho movement in endo txd teeth, CaOH2 based sealer

Baumrind 1996—resorption can occur in adults during ortho movement, men>women

Root Canal Morphology 1

Mannocci 2005—isthmus in mes root of mand molars using uCT—found in majority of roots—up to 50% at 3 mm

Appel 2002—magnetic resonance (NMR) can show detailed 2D and 3D of canal anatomy, no rads, not used clin yet

Kerekes/Tronstad 1977—measurements of ant teeth, canal and root diameter, all can be round, some only to 1 mm

Kerekes/Tronstad 1977—molars, only buccal of max canals, and distal of mand molars, hard to do circle in molars

Peters 2000—uCT able to reliably reproduce 3D anatomy (but high radiation)

Nielsen 2005—mand incisors, M-D width small in pts 40+, only oval access needed (M-D width decrease w/age)

Deutsch 2005—pulp chamber measurements—premolars—guy responsible for pulpout bur (7 mm short)

Von Arx 2005—endoscope, MB of max and M of mand highest isthmus (around 80%), D of mand molar around (36%)

Root Canal Morphology II

Stropko 1999—MB2 up to 73-93% (negotiated to 3-4 mm) (about half of full canals joined before foramen), more experience, higher rate of finding it, 1700

Hess 1917—2800 teeth, examine root canal anatomy w/pics, MB separates into 2 canals as teeth get older

Kartal 1997—M canals of mand 1st molars, MB more curved, more 2ndary curvature, (MB more likely to join ML)

Green 1958—canals round near foramen, more oval as go up, instrument to wide diameter of foramen (only gives averages in this paper, see Tronstad for actual measurements), P and mes of mand molars are more round

Kuttler 1955—foramen off center in older pts, constriction further in older pts (cementum apposition)

Vertucci 1984—different canal classification (max 2nd premolar most variable)

Somma 2009—Micro-CT for MB2—80%, very low sample (30), joined most coronal and midroot

Kulild 1990—95% MB2 found, but most helpful in locating (included canals not instrumentable)

Prognosis of Surgical retreatment

Tsesis 2006—91% success with modern tech (44% w/old style) (esp more success in molars), other factors found no effect of other factors on success (quality of filling, dx, etc.)

Del Fabbro 2007—Cochrane review, shows NS retreat, vs sx retreat, no difference (but used trad sx techniques, not applicable today)

Wang 2004—Toronto study—surg success 74% (but handfiled, loupes only, filled w/GP, unspecified depth of prep, not exclude fxs and other teeth not amenable to tx), smaller pa lesion, inadequate root filling more likely to heal. 17% had complication (crack in tooth, etc)

Christiansen 2009—retro prep and fill vs resect and smooth—MTA: 96%, smoothed GP—52%

Von Arx 2001—PA sx in molars, 88% (use endoscope)

Taschieri 2006—endoscope vs loupes, no diff between loupes and endoscope, also no diff in tooth location or if post

Kim 1999—97% success rate for sx treatment, all tooth types, Super EBA, strict case selection

Rubinstein and Kim 2002—follow up on “healed” cases from 1999, 92% still healed, failures are fx, caries, perio

Kim 2008—healing of endo-perio lesions only 77.5%, 95.2% for endo only lesions w/ surgical tx

Prognosis of NSRCT

Goldman 1972—radiographs, 6/6 examiners agreed only 47%, 5/6 67%

Kerekes and Tronstad 1979—longterm results of RCT, 2-3 visit, 5 yr follow up, 91% success, 5% failure, apical size not significant

Bystrom Sundqvist 1986—healing of PA lesions, 85% healed 2-5 yr f/u, size of lesion, more bacs (harder to disinfect)—negative culture only means can’t detect, still have

Sjogren 1990—overall 91%, no PAP better, PA on retreats only 62%, level of root filling, w/in 2 mm best, than over, then >2 mm short

Friedman 2003—PAI, 81% healed, 92% healed/healing. W/O PA lesion, better than w/ PA lesion—main prog factor (Toronto study)—radiographic study

Molven 2002—10-17 yr follow-up study, radiographic, suggests lesions can take a long time to heal, over-extension

Salehrabi 2004—epidemiological study, 97% retained for 8 yrs, 85% no crown, (unable to determine if PAP)

Ng 2007—meta-analysis—31-96% success rate, variability due to criteria, low evidence for treatment factors

Restoration of Endodontically treated teeth

Reeh, Messer 1989—Endo only weakens tooth 5%, MOD restor weakens 63%, Occ access only may not need crown

Huang, 1992—dehydrated teeth more brittle, even though they are stronger (more likely to fx)

Sedgley 1992—no difference between vital and pulpless in brittleness

Aquilino 2002—teeth without crowns, 6 times more likely to be lost than teeth with crowns

Chugal 2007—PAP is more influential on tx outcome than whether or not crown was placed

Ray, Trope 1995—good crown more important than good RCT—Poor rest: 44%, Poor endo: 67% success (compared to Tronstad study (different population(Sweden)) had opposite results

Ricucci bergenholtz 2000—no significant difference between open GP or restored, emphasizes quality of RCT fill and no patency (if had higher sample, would have been significant)

Schwartz 2004-- Review of posts, glass fiber best because of modulus of elasticity same as dentin

Bergenholtz study on three teeth from hanging weights on there, pulp teeth have more proprioception than pulpless teeth, proprioceptors in pulp?

Vire 1991—endo failures of RCT teeth—only 9% of failures are endodontic, 91% of failures are perio, restorative, etc.

Current Literature 9/2009

Bryce JOE 2009—NaOCl more effective than EDTA, CHX, at disrupting biofilms

Richardson 2009—information about preparing samples, light microscope best overall view, TEM and SEM more details

Murayama 2009—case report of auriculotemporal neuralgia—relieved by nerve block by tragus of ear for 6 mos

De Paula-Silva 2009—CBCT more sensitive for detecting PAP than PAs radiographs (.91 vs .77)

Subramanian 2009—bacteria found in PAP 27/33 cases, DNA used to identify

Simonton 2009—In females, IAN closer to mand 1st molar, thinner mandibular bone. Thinner with age

Huang 2009—revascularization for immature apices w/ necrosis should be done before apexification (revasc can be done because of stem cells from papilla, pulp, pdl, or deciduous teeth) Iwaya was pioneer from Japan

Zitzmann 2009—review paper balanced, RCT vs implants, save tooth if possible to restore, many factors can influence decision,

Apical Size

Delzangles 1988—intracanal resorption found with PAPs, no difference whether cyst or granuloma—larger apical size because of resorption (greater in apex than in coronal,

Kasahara 1991—showed larger apical sizes, showed less debris extrusion, adequate cleaning, except for ribbon shape and curved canals w/ stainless steel

Ricucci and Langeland 1998—most inflammation with overfilling, vital pulp stump—healed. Constriction best, short (>2) second, long is worst

Wu wesselink 2000—finish 2-3 mm short, leaves pulp stump and prevents overfilling in vital, in necrotic less than 2 mm from apex

Coldero 2002—bacteria reduction no diff between 35.04 and 20.04 w/NaOCl. Poorly designed, straight roots only, still at 35.04 1 mm short of WL

Baugh 2005 review article—overall result, larger apical size, cleaner canals, fewer bacteria, potential for success

Weiger 2006—to determine apical size, add 6-8 sizes from IAF

Mickel 2007—4 sizes from IAF, bacteria found in SEM even when negative cultures

Pecora 2008—coronal flaring improves fit of IAF

Retreatment

Budd 2005—measure heat increase during US post removal using thermal radiography—found high temp increases above 20 deg C, w/ no coolant, air and water coolant reduced this (well above 10 deg C threshold for necrosis (Schwartz))—no insulating factor measured

Farzaneh 2004—toronto study—outcome of retx—81% healed, 92 functional, (only 34% recall)

Taintor 1983—retreatment techniques and reasons, may be good to retx before sx to enhance success (Rud)

Ruddle 2004—retx review—says bacteria leakage is cause for apical pathoses

Rawski 2003—Survey for treatment options of endo tx’d teeth w/PAP—endodontists and GPs agree

Danin 1999—compare surg vs non surg retx—no diff stat, but surg had higher success (low sample, old tech) poor

Fristad 2004—retreatment long term 20-27 years (inc from 85-96% success from 10-17 to 20-27%), Molven and Halse did similar studies with initial RCTx

Gorni and Gagliani 2004—RCMR—84%, RCMA-48%; success after 2 yr follow-up, (one-visit retx)

Current Lit Nov 2009

Bose, Hargreaves 2009—outcome of regenerative endo—Trimix better for dentin thickness, trimix and CaOH2 better for root length

Al-Jadaa 2009—ultrasonic activation superior to sonic activation for removal of pulp tissue from simulated lateral canals

Treatment planning—current lit NOV 2009

DiFiore 2008—endo vs implant for treatment planning, endo still preferred, implants more desirable for recent grads

Friedman 2002—post-treatment disease etiology and treatment (this term preferred to success/failure), nonsurg vs surg retreat—depends on individual situation—nonsurg is primary choice, surg is compromised situation (Karabucak and Setzer similar paper 2007)

Wang, Huang 2009—thickening in revasc is due to ingrowth of cementum-like, bone-like or PDL-like tissue from apex

Endo-Perio lesions—same disease(bone lesion) from different origins, can be diagnostic challenge, one or the other, not usually both

Seltzer 1978—pulpal inflammation found in majority of perio diseased teeth, no negative control (no pulp necrosis until perio gets to apex)

Rubach 1965—accessory canals shown to contain perio granulation tissue in perio lesion, causing pulp involv

Czarnecki 1979—no correlation between pulpal involvement and perio involvement, perio NOT CAUSE pulp disease

Mazur Massler 1969—no correlation between perio dx and pulpal involvement,

Bergenholtz 1978—no path changes in pulp (only mild changes) with perio dx, after root planing, no pulp disease (no accessory canals found)(due to the predentin layer in vital pulp acting as a protection)

Gutmann1978—furcation canals prevalent 25-50%, unclear why not cause more problems???

Vertucci 1974—46% had furcation canals, higher rate in longer root trunk

Kerekes 1990—perio and endo flora are very similar, perio may be source of endo infection in intact teeth (hard to tell because they are so similar to start with)

Kobayashi 1990—more anaerobes in canal vs perio pockets, similar overall, perio may be source, but hard to tell because bacteria organize themselves in the canal a certain regardless of source (caries or perio)

Trope 1988—dark field microscopy to dx endo abscess vs perio abscess—spirochetes in perio, no spiros in endo

Ehnevid 1993—PARL retards healing of periodontal lesions, infection in canal may leak out tubules and impair healing of perio w/tx

Perio dx does not affect px of endo tx (sealed from inside, no bacteria ingress to PA lesion)

If endo primarily, don’t do root planing(wait and see if pocket heals, this way avoids removing good attachment)

Microbiology

Kakehashi 1965—no bacteria, no problem (21 germ free, 15 conventional rats) (still vital pulp at 8 days)

Churnside 1958—bacteria in dentin tubules (need to open apex larger or entomb bacteria), teeth not showing cultures may be due to location of sample taken (probably still have bacteria)

Ando/Hoshino 1990—bacteria present in dentinal tubules(up to 2 mm) similar to bacteria in deep layers of carious dentin Advent of anaerobic glovebox (better for culture of anaerobic bacs (contains N2 H2 and CO2)

( + cocci and rods fac aerobes—streptococcus, Actinomyces, and lactobacillus—surface of caries, as caries gets deeper, get anaerobic component in deep layers (black pigmented Bacteroides species, now known as Porphyramonas (asacchrolytic) and Prevotella intermedia (saccharolytic))

Bergenholtz 2000—review article—composites and pulp problems—most likely due to bacterial leakage (shrinkage, removal of smear layer to open dentin tubules contribute) (dendritic cells are APC in dentinal tubules)

Reeves and Stanley1966—reparative dentin is pathologic, leaky, if caries gets here, game over

Bergenholtz 1974—when PA lesion present, bacteria is present in canals(85%, (sundqvist found 95%), if necrotic from trauma and no bacteria, no PARL

Baumgartner 1991—68% of bacteria in apical 5 mm are anaerobic—shows that apical area is selective for anaerobes (since coronal area is predominantly aerobic from saliva, etc)

Sundqvist 1992—ecology of RC flora (commensalism, antagonism(bacteriocins), oxidative potential (aerobic bacteria use up oxygen and select for anaerobic conditions) RCT is disruption of ecosystem to degree that it doesn’t regroup

Sundqvist 1979—bacteria all caused PARLs, Bacteroides species caused apical abscesses.

Sundqvist 1989—Bacteroides are linked to acute apical abscess formation (16/22 w/ Bacteroides had abscess, 1/50 w/o bacteroides had abscess)

Bystrom—positive culture has lower success rate

Sundqvist 1998—retreatment bacteria were monomicrobial, positive culture during filling has lower success (74% of retreatment’s were successful

Molander 1998—retreatment, 69% facultative anaerobes, chloroform treated teeth had less growth (bacteria