lecture 12 - dental anomalies Flashcards
anomaly
deviation from normal usually related to embryonic development that may result in the absence, excess, or deformity of body parts
anodontia
absence of teeth
hypodontia
missing one or two teeth
most commonly missing in order
- third molars
- maxillary lateral incisors
- mandibular second premolars
canines least likely
supernumerary teeth
extra teeth
90% occurrences on maxilla
mesiodens
small supernumerary teeth forms between central incisors
peg shaped laterals
develop from one lobe instead of four
could be genetic or disturbances during development
gemination or twinning
splitting of a single forming tooth
tooth could is normal!!!!!
fusion
union of two tooth germs always involving the dentin
one less tooth count!!!!!
what two crown disturbances can happen from a mother passing syphilis to her unborn baby
hutchinson’s incisors and mulberry molars
hutchinson’s incisors
screwdriver shaped, broader cervically, notched incisal edge
mulberry molars
“berry like” tubercles on occlusal surface with no distinguishable cusps
enamel pearls
small round nodules of enamel with a tiny core of dentin
can be felt with an explorer or probe
taurodontia - bull or prism teeth
very long pulp chamber without constriction at CEJ
american indians and artic population
dilaceration or flexion
severe bend or angular distortion of a tooth root
dens in dente
tooth within a tooth
developmental resulting from the invagination of the enamel organ within the crown of a tooth
dwarfed roots
normal crowns small roots
why do un-erupted teeth fail to erupt
because of lack of eruptive force
why do impacted teeth fail to erupt
because of mechanical obstruction
ex: not enough space
transposition
misplaced teeth
canine where a lateral incisor should be
ankylosis
loss of periodontal ligament space so the tooth root is fused to the alveolar bone and won’t erupt
enamel dysplasia
disturbance in the enamel-forming cells (ameloblasts) during early enamel formation
ex: amelogenesis imperfecta, fluorsis, high fever causing, focal hypoplasia
dentin dysplasia
occur more frequently than those in enamel
ex: dentinogenesis imperfecta, tetracycline stain,
is changes in tooth shape after tooth eruption considers anomolies
no because they are from injuries
attrition
wearing away of enamel fur to movement
teeth-to-teeth
bruxism
abrasion
wearing away of tooth structure by mechanical force
tooth brush abrasion, tobacco use
erosion
loss of tooth structure by chemical means
beverages, acid reflux, bulemia
abfraction
cervical loss of tooth structure thought to occur from tooth “bending” under heavy occlusal forces
