Disorders of tooth form Flashcards
Where is enamel derived from
Epithelial components
Where are dentine and cementum derived from
Mesenchymal components
What is dilaceration
Abnormal angulation or bend in the root
What is dens invaginatus
Infolding of enamel into dentine. Infold represent stagnation sites for bacteria and can predispose to caries
What is dens evaginatus
Anomalous tubercule or cusp located towards the centre of the occlusal surface
What is turner tooth
A tooth with an area of hypoplasia consequent to a periapical infection of its deciduous predecessor
Hutchinson’s incisor
Peg shaped incisors caused by in- utero infection by congenital syphilis (Treponema pallidum)
What is hypodontia/ partial anodontia
Less than 6 teeth missing
What is anodontia
Congential absence of all primary or permanent teeth
What is microdontia
Having smaller teeth than regular
What is endogenous staining
Fluorosis
Affects the teeth whilst they are still developing
What is exogenous staining
Tetracycline staining
Affects the teeth after eruption. Binds to calcium. Severity depends on dose, length of usage etc
What is tetracycline
Antibiotic - used to treat bacterial infections
What are ectodermal dysplasia’s
Diverse group of genetic disorders that involve defects of the hair, skin, nails
What does hypohidrotic mean
Reduced ability to sweat.
What does hyptrichotic mean
Reduced hair
How many forms of amelogenesis are there
14
How is amelogenesis characterised
Enamel hypoplasia/ hypomineralisation
What inheritance pattern is amelogenesis
X linked recessive
What are the classifications of amelogenesis
Class I - Hypoplastic
Class II - Hypomaturation
Class III - Hypocalcified
Class IV - Hypomaturation with taurodontism
What is taurodontism
Anomaly defined by enlargement of the pulp chamber
How many types of dentinogenesis are there
3
What are the different types of dentinogenesis
Type I DI - Occurs in people who also have osteogenesis imperfecta. This condition is similar in genetic origin but causes brittle bones.
Type II DI occurs in people without another hereditary disorder and affects primary more than permanent teeth. This may occur in people who exhibit signs of age-related hearing loss or deafness. Type II is the most common type of dentinogenesis imperfecta.
ACCORDING TO THE NATIONAL ORGANIZATION FOR RARE DISORDERS, type III DI occurs in people without another hereditary disorder and seems to be isolated to a group of individuals in southern Maryland.
