M1: Defects of Enamel and Dentin

Hypoplastic Amelogenesis Imperfecta

Radiographic features: Enamel reduced in bulk, shows thin layer over occlusal.

Hypoplastic Amelogenesis Imperfecta

Treatment: No treatment is necessary

Hypomaturation Amelogenesis Imperfecta

Hypomaturation Amelogenesis Imperfecta

Radiographic features: Affected enamel exhibits radiodensity similar to dentin

Hypocalcified Amelogenesis Imperfecta

Radiographic features: Density of enamel and dentin are similar.

Dentinogenesis Imperfecta

• Affects both primary and permanent dentition.

• Have blue brown discoloration

• With distinctive translucence

• Enamel frequently separates easily from underlying defective dentin.

DI Type I

Radiographic features: Partial or total obliteration of pulp chamber and root canals

DI Type II

Radiographic features: Partial or total obliteration of pulp chambers and root canals.

DI Type III

Radiographic features: Periapical radiolucencies

DI Type I

Clinical features: Primary teeth are more severely affected than permanent teeth.

DI Type II

Clinical features: Only have dentin abnormalities and no bone disease.

DI Type III

Clinical features: “bradwine type” multiple pulp exposures in deciduous, which is not seen in type I and II

Dentin Dysplasia

• Is also known as “rootless teeth”

• Rare disturbances of dentin formation, which had an abnormal pulpal morphology

DD Type I Radicular

Clinical features: Premature tooth loss may occur because of short roots or periapical inflammatory lesions.

Type I (Radicular type)

Radiographic features: roots are extremely short, pulps are almost completely obliterated

DD Type II Coronal

Clinical features: Color of the primary dentition is opalescent while in permanent dentition is normal.

Type II (Coronal type)

Radiographic features: Deciduous - roots are extremely short, pulps are almost completely obliterated.

  Permanent dentition - abnormally large pulp chambers in the coronal portion of the teeth.

a. Root dilaceration of mandibular molar; b. Concrescence between mandibular first and second molar; c. Talons’ cusp on the labial aspect of maxillary lateral incisor; d. Crown dilaceration of maxillary central incisor; e. Taurodontism in maxillary second molar; f. Enamel pearl on buccal aspect of mandibular third molar

a. Root dilaceration of mandibular molar; b. Talons’ cusp lined by enamel containing core of dentin and pulp in maxillary lateral incisor; c. Fusion of root between mandibular second and third molar; d. Crown dilaceration of maxillary central incisor; e. Concrescence between mandibular first and second molar with dens evaginatus; f. Enamel pearl seen as radio-opaque foci near the furcation area