OD22 Flashcards
What are the two main types of amelogenesis imperfecta?
Hypoplastic – defective matrix production, HARD ENAMEL. Thinning, vertical grooves, pitting.
Hypomineralised / Hypomaturation – defective mineralisation, SOFT ENAMEL. Chalky, exposed dentine.
What are the two main abnormalities of dentine?
Type I DI in osteogenesis imperfecta- kids with crutches/ wheelchairs, systemic bone problems
Type II Teeth only / Shell teeth
Clinical features of Osteogenesis Imperfecta?
Defect in type 1 collagen.
Slender bones = mechanically weak Deformity / Fractures / Deafness Lax ligaments / Thin translucent skin Blue sclera, in whites of eyes Dentinogenesis imperfecta
Features of Dentinogenesis imperfecta type II?
Discoloured teeth = similar to teeth stained by tetracycline Grey / Brown tint Bulbous crowns (especially on molars) Rapid attrition, extreme wear Pup chamber larger than normal Obliterated pulp chambers
Briefly describe dentinal dysplasia?
Type I Radicular dentinal dysplasia • (Rootless teeth) • Normal crowns • Short roots • Pulp obliterated • Roots composed of dysplastic dentine • Dentinal tubules disorganised • Calcified globules of abnormal dentine
Type II Coronal dentinal dysplasia • Deciduous teeth look like DI • Permanent teeth look normal • Pulp obliterated • Pulp stones • Thistle shaped pulp
General and dental features of rickets?
Appearance
• Short statute
• Bow-legs
• Bone deformity and fractures
Teeth
• Delayed eruption
• Enamel hypoplasia – may resemble amelogenesis imperfecta
• Dentine abnormalities
Regional odontodysplasia is also known as?
Ghost teeth
Abnormalities of cementum?
Hypercementosis / Ankylosis
First teeth to erupt?
Mandibular incisors
Problems of premature eruption in babies?
Hypoplastic enamel / Rootless
Mobile – exfoliated / risk to airway
Interfere with feeding
