Exam 7: Dental Anomalies

A distomolar is attached to the distal surface of a maxillary molar.Maxillary distomolars are the most common supernumerary teeth.

The canines are LEAST likely of all permanent teeth to be congenitally missing because unlike other permanent teeth,canines begin to calcify by about the fourth of fifth month of fetal life.

Turner's tooth results in notched incisors and mulberry molars because prenatal syphilis disturbs normal tooth formative processes.

An anomaly common to mandibular second premolars is

A child who has congenitally missing maxillary canines will have congenitally missing permanent canines.

Gemination occurs most frequently in the permanent dentition.It is the splitting of the tooth into two crowns and separate roots.

A patient who has had four teeth extracted for orthodontia has true partial anodontia.

Which permanent tooth is the LEAST likely to be congenitally missing?

Each of the following is an example of microdontia EXCEPT one.Which one is the EXCEPTION?

Dens in dente,or dwarfed roots,is a developmental variation that occurs because the outer surface of the tooth crown invaginates by turning itself inward prior to mineralization.

Tetracycline staining is an enamel dysplasia that occurs because an expectant mother or young child with tooth crowns still developing takes the antibiotic tetracycline.

Each of the following is true of dentinogenesis imperfecta EXCEPT one.Which one is the EXCEPTION?

An unusually large tooth is an example of

Fusion involves the joining of two adjacent teeth at the cementum because this process is associated with excessive production of cementum.

Anomalies are caused by intrinsic factors only.

A fourth molar may be described by each of the following EXCEPT one.Which one is the EXCEPTION?

Fusion of roots of adjacent teeth at the cementum is called concrescence and is primarily caused by dilaceration.Gemination is the deposition of excessive secondary cementum.

The MOST commonly missing permanent teeth are the maxillary premolars.The next teeth MOST likely to be missing are the permanent maxillary lateral incisors.

Supernumerary maxillary teeth are more common than supernumerary mandibular teeth because metabolic intrinsic factors within the palate produce more hyperdontia.

Intrinsic factors that can contribute to dental anomalies include all of the following EXCEPT