Accesscavitypreparation 130320102559 Phpapp01(2)

8/11/2019 Accesscavitypreparation 130320102559 Phpapp01(2)

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PREPARED BY:DR. HAMED AL-HADDAD

Endodontic Access CavityPreparation

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Access Cavity Preparation

MAJOR OBJECTIVES1- Straight-Line Access

2- Conservation of Tooth Structure

3- Unroofing of Chamber and Exposure of Pulp Horns

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Endodontic Preparation ofMaxillary and mandibular

Anterior Teeth

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Maxillary CentralIncisor

Central incisor are large and on an average of 23 mm.

It has a single canal and a single apical foramen.

The canal form is usually Type I.

The pulp in young patients normally has 3 pulp horns.

The pulp chambers is noticeably wider in the faciolingual

direction than in the mesiodistal.

All upper anterior teeth haveone root and one canal.


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Maxillary Lateral Incisor

It is shorter than central incisor.

Average length of 21- 22mm.

It has a single canal and a single apical

foramen.

The canal form is usually Type I.

In young patients have two only pulp horn and is wider

in labiopalatal dimension.

The canal is tapered and the apex is often

curved generally in distal direction.


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Maxillary CanineIt is the longest tooth (26.5 mm)

Seldom has more than one canal

The pulp chamber is quite narrow M- D, and there is

one pulp horn pointed to the incisal angle.

The pulp space is much wider labiopalatally

and the pulp space follows this outline.

Oval Type I root canal.

The root apex is often tapered and very thin.

The canal is usually straight but may show a distal apicalcurvature.


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Mandibular Central and LateralIncisors

CENTRAL

LATERAL

Average lengthis 21 mm, but the centralincisor may be shorter than the lateral.

The root canal morphology may be place

into 1 or 3 configurations. Type I canal

form is most prevalent, Types II and III

are less prevalent.

The pulp chamber is smaller replica

of the upper incisors.

When the tooth has a single root canal it

is normally straight but may curve to

the distal.


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Mandibular Canine

Smaller than the maxillary canine.

The average length is 22.5 mm.

Type I canal form is most prevalent.

Rarely has 2 roots, but fewer of mandibular canine displaythe Type IV canal form with 2 separates apical formina.


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Access cavity preparation

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Endodontic Preparation ofMaxillary Anterior Teeth

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Endodontic Preparation ofMaxillary Anterior Teeth

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Adult tooth


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Cavity Access. Canine

Extensive ovoid, funnel-shaped coronal preparation

M ill A t i T th


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Maxillary Anterior TeethERRORS in Cavity

Preparation

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M ill A t i T th


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Maxillary Anterior TeethERRORS in Cavity

Preparation

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Endodontic Preparation of MandibularAnterior Teeth

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Mandibular Anterior TeethERRORS in Cavity Preparation

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Mandibular Anterior TeethERRORS in Cavity Preparation

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Endodontic Preparation ofMaxillary and mandibularPremolar Teeth

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M ill Fi t


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Maxillary FirstPremolar

Generally has 2 root with 2

canals, but in the case of 1 root has 2

canals which open in a common apical

foramen.

Many types of canal

configurations.

Average length 21.5 mm.

The pulp chamber is wide B-P

with 2 distinct pulp horn.

M-D, the pulp chamber

is much narrower.


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Endodontic Preparation ofMaxillary First premolar Teeth

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Young tooth Adult tooth


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Maxillary Second PremolarThe typical second premolar has one

root and one canal and sometimes

has an apical distal curvature.

The Type I canal form is prevalent with

a frequency of 48%, approximately the same

as types II and IV-VII combined.

The pulp chamber is wider B-P and narrower M-Dand has 2 well define pulp horns.

The canal orifice is directly in the centre of thetooth.

Average length: 21 mm.

Endodontic Preparation of


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Endodontic Preparation ofMaxillary Second premolar

Teeth

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Endodontic Preparation of Maxillary


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Endodontic Preparation of MaxillaryPremolar Teeth

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Maxillary Premolar TeethERRORS in Cavity Preparation

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Maxillary Premolar TeethERRORS in Cavity Preparation

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Mandibular PremolarsUsually has a single delicate root

with a mesial concavity, butoccasionally present a division of

the root in the apical half.

As a rule, both teeth have a single canal.

The coronal pulp is wide B-L with a large

buccal horn and a small lingual horn.

The shape of the canal is similar in first and second

premolars.

Its buccolingual extension is broad until the

middle third of the canal, but is very narrow in

the apical third. Average Length: 22mm


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Cavity Access

Because of the inclination of the crowns ofmandibular teeth and the smaller lingualcusp, the access opening should be placedbuccal to the central fissure.

The preparation is made

oval, corresponding to theshape of the root and canal.


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Endodontic Preparation ofMandibular premolar Teeth

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Endodontic Preparation of Mandibular


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Endodontic Preparation of MandibularPremolar Teeth

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Mandibular Premolar TeethERRORS in Cavity Preparation

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Mandibular Premolar TeethERRORS in Cavity Preparation

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Endodontic Preparation ofMaxillary and mandibularMolar Teeth

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Maxillary First Molars

Generally three rooted with 3 canals. Additional

canal is located in the MB root.Large pulp chamber, triangular in shape, with

the base toward the buccal and the apex towardthe lingual surface.

Slightly curved buccal roots.

DP curvature of the MB root.Apical-buccal curvature of the

palatal root (55%)

Average Length:MB: 20mmDB: 19.5mmP: 20.5mm


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It has 3 or 4 pulp horn, the MB is the longest.

The floor of the pulp chamber is normally just apical to

the cervix and is rounded and convex to the occlusal.

The MB canal opening is closer to the buccal

wall than is the DB orifice.

The DB canal is closer to

the middle of the tooth than

to the distal wall, and is

the shorter and finest

of the 3 canals.

Maxillary First Molars


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Endodontic Preparation ofMaxillary First molar Teeth

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Maxillary Second Molar

It is similar of the first molar:Large pulp chamber.

Mesiobuccal, distobuccal, and palatal

roots, each with one canal.

Gradual curvature of all three canals.

Flattened triangular outline form.

The DB canal orifice is nearer the centre of the

cavity floor.


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Endodontic Preparation ofMaxillary Second Molar Teeth

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Endodontic Preparation of Maxillary Molar


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Endodontic Preparation of Maxillary MolarTeeth

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Locate canal orifices & obtain


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Locate canal orifices & obtainStraight-Line Access

Probing the Canal EntrancesAfter the roof of the pulp chamber has been penetrated

and the access cavity prepared, the entrances to the

pulp canals must be probed.

A hooked explorer can be used to determine if

enough dentin has been removed

The canal entrances are found by feeling with a thin,

stiff explorer. If the explorer sticks in a spot, a size 15

Hedstr6m file is used to verify that the spot is indeed

the entrance to a root canal and not a perforation. Only

then is the opening gently enlarged. Narrow root canals

must first be enlarged coronally with a Hedstr6m file

before the deep preparation with Gates-Glidden burs can be started.


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Maxillary Molar TeethERRORS in Cavity Preparation

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Maxillary Molar TeethERRORS in Cavity Preparation

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Mandibular First MolarUsually has 2 roots one mesial

and one distal.

The Distal root is smoller andvertical.

Distal curvature of the mesial root(84% of the time) which has twocanals.

The distal canal is larger and moreoval.

The MB is the most difficult canal to

instrument because its tortuous path.


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Average Length: 21 mm

Triangular outline form

reflects the anatomy of

the pulp chamber, withthe base toward mesial

and the apex toward the

distal surface.

The cavity is primarily within the mesialhalf of the tooth but is extensive enough

to allow positioning of instruments and

filling materials.


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Mandibular Second Molar

It is smaller version of the first molar withan average length of 20mm.

The mesial root has 2 canals and the distalone.

The mesial canals tend to fuse in the apical

third to give rise to one main apicalforamen.

Commonly has fused roots.

E d d ti P ti f


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Endodontic Preparation ofMandibular Molar Teeth

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Endodontic Preparation of Mandibular


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Endodontic Preparation of MandibularMolar Teeth

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M dib l M l T h


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Mandibular Molar TeethERRORS in Cavity Preparation

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M dib l M l T th


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Mandibular Molar TeethERRORS in Cavity Preparation

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Thank you

Documents

Accesscavitypreparation 130320102559 Phpapp01(2)