Dental anomalies Flashcards
Partial anodontia is…
One or more missing teeth from a dentition
The cause of partial anodontia is thought to be…
Hereditary
Are anomalies more prevalent in permanent or primary dentition?
Permanent
Name the anomaly where a small supernumerary tooth is located between central incisors
Mesiodens
Supernumerary teeth are most frequent in what regions?
Maxillary incisors & maxillary third molars
A tooth that has undergone gemination has…
A single, unsplit root with a common pulp canal
What is gemination/twinning?
Incomplete tooth division where the single forming tooth splits; crown appears doubled in width
Describe fusion
The union of two adjacent tooth germs involving the dentine. They have fused roots with separate pulp chambers.
Fusion of teeth is more commonly found in…
Primary dentition > secondary dentition
Mandibular incisor area > maxilla
Macrodontia impacts…
Incisors & canines
Microdontia impacts…
Maxillary lateral incisors & third molars
Dilaceration of a tooth refers to…
The severe bend/angular distortion of a tooth root
The cause of dilaceration can be from…
Traumatic mouth injury or insufficient development space
What is dens in dente?
“Tooth within a tooth”
Occurs due to the invagination of enamel organ within the crown of a tooth
Dens in dente is prevalent in the…
Maxillary lateral incisors
The fusion of cementum of two adjacent tooth roots is called…
Concrescence
Concrescence occurs due to…
Excess cementum deposition and close proximity of adjacent tooth roots following eruption
Describe hypercementosis
Excess cementum formation around tooth root after tooth eruption
What are the potential causes of hypercementosis?
Trauma, metabolic dysfunction or periapical inflammation
The failure of tooth eruption due to mechanical obstruction is called…
Impaction
Impaction most commonly affects…
Maxillary & mandibular third molars
What is ankylosis?
The loss of the periodontal ligament (PDL) results in the fusion of tooth root to bone
What causes the loss of the periodontal ligament (PDL) in ankylosis?
Trauma or infection of the PDL
Describe the appearance of a tooth affected by ankylosis
Fails to reach occlusion, appears shorter than adjacent teeth
An ectopic tooth is…
A tooth bud formed out of correct position
