Structural abnormalities affecting enamel and dentine Flashcards
What is the most common defect?
Amelogenesis imperfecta
Abnormalities from dental lamina formation stage
Hypodontia
Supernumerary teeth
Double teeth
Odontomes
Odontogenic tumours/keratocyst
Histodifferentiation stage
Regional odonto-dysplasia
Morphodifferentiation (size and shape)
Macrodontia
Microdontia
Dens invaginatus/evaginatus
Talon cusp
Taurodontism
Matrix deposition
Amelogenesis imperfecta
Dentinogenesis imperfecta
MIH
Chronological enamel hypoplasia
Fluorosis
Dentine dysplasia
Eruption and root development
Natal and neonatal teeth
Ectopic eruption
Delayed eruption
Transposition
Impactions
Amelogenesis imperfecta pattern of inheritance
sporadic
almost all teeth are affected to more or less the same extent
developmental condition
genomic in origin
affects the structure and clinical appearance of enamel
associated with morphologic or biochemical changes elsewhere in the body
What are the changes at the formation stage?
Matrix deposition is decreased - thin enamel = quantitative defect
What are the changes at calcification stage?
Matrix mineralisation - quality defect
What are the changes at the maturation stage?
Crystals enlarge/mature - quality defect
What is hypoplasia?
Little enamel
What is hypomineralisation?
Normal enamel but minimal mineralisation
What are the characteristics of hypoplastic enamel?
pitted
hard enamel
reduced amount of enamel
What are the characteristics of hypo mineralised enamel?
white to yellow opacities
soft, porous enamel
poor quality enamel
bonding affected
Diagnostic history questions
FH?
Are all teeth affected in same manner/extent?
Any childhood illnesses during first 3y?
F history - swallowing toothpaste
Maternal issues, birth issues
Pedigree chart
Radiographs
Clin exam