Abnormalities of Teeth Flashcards
The congenital absence of six or more teeth is known as:
Oligodontia
Absence of 1 or more teeth; congenitally missing teeth.
What tooth is most commonly affected?
Hypodontia
Third molars
Is having 2 successive sets of teeth (as in humans)
Diphyodontia
What is polyphyodontia?
Having more than 2 sets of teeth in a lifetime
Hypsodontia is?
Having teeth with high crown (cusps)
It is associated with a diet of abrasive food
Hypsodont dentition
What type of dentonigenesis imperfecta features multiple pulp exposures, periapical radiolucencies, and a variable radiographic appearance?
Type III (Brandywine type)
Is an autosomal dominant condition in which there is an intrinsic alteration in the dentin.
Dentinogenesis imperfecta
Dentin abnormality occurs in patient that have osteogenesis imperfecta (characterized by blue sclera or a history of bone fractures) ; PRIMARY teeth are more severely affected.
Dentino. Imp. Type I
Clinically termed as “Osteogenesis Imperfecta with opalescent teeth”
TYPE I D.I
Most common supernumerary tooth
Mesiodens
Is a developmental union of two or more teeth in which the dentin and other dental tissue are united
Fusion
Cementum of two or more teeth becomes united
Concrescence
Also called as dens invaginatus means “tooth within a tooth”; a deep invagination of the enamel organ during formation.
Most likely associated tooth?
Dens in dente
Maxillary lateral incisor
A single tooth bud attempts to divide and gives rise to the appearance of two clinical crowns
Gemination
All of the following are differential diagnoses for hypercementosis EXCEPT one.
Cemento - osseous dysplasia
Cementoblastoma
Condensing osteitis
Odontogenic keratocyst
OKC
An enamel defect resulting from the incomplete formation of the enamel matrix is called:
Enamel hypoplasia
It involves hard tissues that are derived from both epithelial (enamel) and mesenchymal (dentin and cementum); exhibits short roots, open apical foramina and enlarged pulp chambers.
Regional odontodysplasia
Clinical appearance of enamel hypoplasia
Lack of contact between teeth
Rapid breakdown of occlusal surface
Yellowish-brown stain
Fusion of the cementum or dentin to the surrounding alveolar bone after loss of the intervening periodontal membrane; associated with hypodontia
Ankylosis
Most commonly ankylosed tooth
Primary 2M
The abnormal loss of tooth structure due to non-masticatory physical friction is referred as:
Abrasion
Is the wearing away of enamel and dentin due to the normal function or most commonly, due to excessive grinding or gritting together of teeth by patient.
Attrition
Wedge shaped cervical erosive lesion that cannot be attributed to any particular cause
Abfraction
The following conditions cause intrinsic staining of teeth:
Dentinogenesis imperfecta
Erythroblastosis fetalis
Porphyria
Fluorosis
Pulpal injury
Internal resorption
Tetracyclines
Hypomineralized enamel
In an unusual form of tooth resorption that begins centrally within the tooth; endodontic therapy may be carried out
Internal resorption
Extremely common and typically involved the middle or apical root. The source of resorption is in the PDL.
External resorption
Type I dentin dysplasia, roots appear extremely short, and pulps are:
Completely obliterated
An autosomal dominant trait that affects dentin.
Dentin dysplasia
Radiographic features:
Obliterated pulp chambers and root canal
Residual fragments of pulp tissue appear typically as horizontal lucencies (chevrons)
Type I (radicular dysplasia) - more common type
“Thistle tube” in appearance
Type II (coronal dysplasia)