Diagnostic Aids in Orthodontics Full[1]

Diagnostic aids in Diagnostic aids in orthodonticsorthodontics

Orthodontic study castFacial and intra-oral photographs

Lateral cephalometric radiographs

Panoramic radiographs or full mouth periapical radiographs

Orthodontic study castOrthodontic study castThey are

accurate plaster reproductions of the teeth and their surrounding soft tissues

Orthodontic study castOrthodontic study cast

Orthodontic study castOrthodontic study castUses of study models:

1.Assist and record dental anatomy

2. Assist and record intercuspation

3. Assist and record arch form4. Assist and record the curves

of occlusion 5. Calculate total space analysis6. Measure progress during

treatment7.Medico legal documentation

Orthodontic study castOrthodontic study castParts of study cast

Anatomic portion

Artistic portion

Orthodontic study castOrthodontic study castPont’s analysis:Measurement of the 4 maxillary

incisors automatically establish the width of the arch in the premolar and molar region by using :

Calculated premolar value= SI x 100

80 Calculated molar value = SI x 100 64Measured premolar and molar value

is obtained from the distance between distal end of the occlusal groove

(SI = the sum of incisors)

Orthodontic study castOrthodontic study castCarey’s analysis Is to discover the arch length –

tooth size discrepancy

Orthodontic study castOrthodontic study castBolton AnalysisBolton AnalysisTo determine the

disproportion between the size of the maxillary and mandibular teeth

Overall ratio= sum of mand12 x 100

sum of max

Overall Ratio = 91.3%

Anterior ratio= sum of mand6 x 100

sum of max

Anterior ratio = 77.2%

Orthodontic study castOrthodontic study castmixed dentiton analysis:Used to evaluate the amount of

space available in the arch for succeeding permanent teeth

Moyer’s mixed dentition analysis

By using prediction charts

Tanaka and Johnson analysisTanaka and Johnson analysis

Predicted width of canine and premolarPredicted width of canine and premolar

Maxillary= sum of mandibular incisors Maxillary= sum of mandibular incisors + 11+ 11 22

Mandibular= sum of mandibular Mandibular= sum of mandibular incisors + 10.5incisors + 10.5 22

Unerupted tooth size =

Erupted tooth on cast X uneurpted on xray Erupted on x-

Lateral cephalometric Lateral cephalometric radiographsradiographs

Uses of cephalometric1. Study of crainofacial growth2. Diagnosis of craniofacial deformity3. Treatment planing4. Evaluation of treated case5. Study of relapse6. Medico-legal documentation

Nasion (Na) Nasion (Na)

Sella (S) Sella (S)

Porion (P) Porion (P)

Orbitale Orbitale (Or) (Or)

Anterior Nasal Spine Anterior Nasal Spine (ANS) (ANS)

Posteior Nasal Spine Posteior Nasal Spine (PNS) (PNS)

Subspinale (A)Subspinale (A)

Supramental (B) Supramental (B)

Gnathion (Gn) Gnathion (Gn)

Menton Menton (Me) (Me)

Gonion Gonion (Go) (Go)

Sella nasion plane (SN)Sella nasion plane (SN)

Frankfurt horizontal plane Frankfurt horizontal plane (FH) (FH)

Palatal plane (PP) Palatal plane (PP)

Mandibular plane (MP) Mandibular plane (MP)

SNA SNA 8282OO

SNB SNB 8080OO

ANB 2ANB 2OO

Y axis Y axis 5959OO

Mandibular plane angle Mandibular plane angle 3232OO

Inter incisal angle135Inter incisal angle135OO

LateralLateral cephalometric cephalometric radiographsradiographs

Diagnostic Aids in Orthodontics Full[1]

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