Developmental Disorders of Teeth Flashcards
What stage of tooth development does megadontia occur?
Cap stage (growth and proliferation)
What are the 5 stages of tooth development?
Dental lamina, cap stage, bell stage, enamel/dentine formation, root crown development
Do environmental defects frequently affect the enamel or dentine and why?
Enamel - ameloblasts are particularly sensitive to external stimuli
Why does Turner tooth occur? does it occur in enamel or dentine? what colour is the tooth?
- Periapical disease of the overlying deciduous tooth
- Areas of white / yellow / brown
- Enamel affected
- The whole crown is affected
Why does dilaceration of a permanent tooth occur? What is the treatment?
- Trauma to deciduous tooth in underlying permanent successor
- Upper incisors commonly affected
- Treatment = often no treatment required, delayed/arrested eruption can occur needing ortho or extraction
How does chronological hypoplasia present?
The point of tooth formation at the time results in horizontal rows, pits and grooves and opaque enamel.
Does premature birth affect the enamel or dentine? What does it cause?
Ameloblasts
Enamel pitting and opacification and discolouration of enamel
What are the effects of fluorosis on teeth? Are all or some of the teeth affected?
- Enamel hypoplasia
- Enamel opacities
- Enamel pitting
- Enhancement of perikymata
- ALL TEETH AFFECTED
What types of molars and incisors does tertiary syphilis cause?
Hutchinsons incisors - smaller, rounder, barrel shaped
Moons molars - small, dome shaped, rounded crown and cusps
Mulberry molars - small occlusal table with a bumpy and pitted occlusal surface
Does tetracyline staining affect the whole tooth or just increments?
What affects the severity of tetracycline staining?
- Incremental (just at time of taking them)
- Time
- Dose
- Duration
What is the main differential of tetracycline staining?
- Dentinogenesis imperfecta
Why does rhesus blood group incompatibility between mother and child cause problems with teeth?
- Jaundice is severe, bilirubin can build up in green / yellow colour
Explain what AI is and three main types?
Groups of mutations leading to defects in enamel structure caused by defects in genes which encode proteins required in enamel matrix production or enamel mineralisation.
Three types:
- Hypocalcifed = normal thickness, minimal mineralisation
- Hypomature = normal thickness, brown patches
- Hypoplastic = affect in enamel thickness
Is DI acquired or congenital?
does it affect the whole dentition? What do the teeth look like?
Congenital, whole dentition
- short clinical crowns, very small pulp chambers, junction between enamel&dentine
Which of these does regional odontodysplasia?
Developmental abnormality of enamel, dentine and pulp.
Often idiopathic. Leads to ghost teeth
