DEVELOPMENTAL ANOMALIES OF THE TEETH Flashcards
● Alteration in Shapes and Forms
A. Shape of the Crown
- Germination
- Fusion
- Taurodontism
- Talon’s Cusp
- Dens Evanginatus
- Dens Invaginatus
- Peg shaped Lateral
- Hunchinson’s Incisor
- Mulberry Molar
● Alteration in Shapes and Forms
B. Shape of the Root
- Concrescence
- Enamel Pearl
- Dilaceration
- Flexion
- Ankylosis
● Geminated teeth are anomalies which arise from an
attempt at division of a single tooth germ by an
invagination, with resultant incomplete formation of
two teeth
GEMINATION
● Fused teeth arise through union of two normally
separated tooth germs
● May be either complete or incomplete
FUSION
● Body of the tooth is enlarged at the expense of the
roots
TAURODONTISM
● Possible clinical problems
○ Appearance
○ Spacing
○ Periodontal conditions
TAURODONTISM
● Classification:
○ Hypotaurodont
○ Mesotaurodont
○ Hypertaurodont
● An anomalous structure resembling an eagle’s talon,
projects lingually from the cingulum areas of a
maxillary or mandibular permanent incisor
TALON CUSP
TALON CUSP
● Problems:
○ Esthetics
○ Caries control
○ Occlusal accommodation
● Dens in dente, Dilated composite odontome
DENS INVAGINATUS
● A developmental condition that appears clinically as an
accessory cusp or a globule of enamel on the occlusal
surface between the buccal and lingual cusp of
premolar
DENS EVAGINATUS
deep invagination in the lingual pit
area, which may not be evident clinically;
MILD FORM
invagination that extends nearly
to the apex of the root, and these present a
bizarre radiographic picture
MORE SEVERE
● One of the common forms of localized microdontia is
that which affects the maxillary lateral incisor, a
condition that has been called
PEG SHAPED LATERAL
● Enamel Hypoplasia due to Congenital Syphilis
● Present a character, almost pathognomonic,
appearance
HUTCHINSON’S INCISOR AND MULBERRY MOLAR
● A form of fusion which occurs after root formation has
been completed
● Teeth are united by cementum only
CONCRESCENCE
● Defined as an ectopic globule of enamel that is firmly
attached to the tooth root
ENAMEL PEARL
● Thought to be due to trauma during the period in
which the tooth is forming, with the result that the
position of the calcified portion of the tooth is changed
and he remainder of the tooth is formed at an angle
DILACERATION
● Teeth with a lesser bending of roots (compared to
dilaceration) which is observed in the absence of
trauma
FLEXION
● Defects of Enamel and Dentin
ENAMEL
- Amelogénesis Imperfecta
- Environmental Enamel Hypoplasia
- Localized Enamel Hypoplasia
● Fusion between the tooth and bone
● Ensues when partial root resorption is followed by
repair with either cementum or bone that unites the
tooth root with the alveolar bone
ANKYLOSIS
● Defects of Enamel and Dentin
DENTIN
- Dentinogenesis Imperfecta
- Dentin Dysplasia
● Structural defect of the tooth enamel
AMELOGENESIS IMPERFECTA (AI)
caused by reduction in the
amount of matrix protein secreted, the
clinical presentation is usually thin enamel,
surface pitting or vertical grooving
Hypoplastic (HP)
characterized by the presence of normal
amounts of enamel matrix that is deficiently
mineralized
Hypocalcified (HC) and Hypomature (HM)
● Defined as an incomplete or defective formation of the
organic enamel matrix of teeth
ENVIRONMENTAL ENAMEL HYPOPLASIA
Two basic types of enamel hypoplasia exist:
- Hereditary type
- A type caused by environmental
factors
ETIOLOGIC FACTORS:
● Nutritional deficiency (Vitamin A, C and D)
● Exanthematous disease (e.g. measles, chicken
fox, scarlet fever)
● Congenital syphilis
● Hypocalcemia
● Birth injury, prematurity, Rh hemolytic disease
● Local infection or trauma
● Ingestion of chemicals (chiefly fluoride)
● Idiopathic causes
● An autosomal dominant condition affecting both
deciduous and permanent teeth
DENTINOGENESIS IMPERFECTA
● Aka Opalescent dentin, Dentinogenesis Imperfecta
without osteogenesis imperfecta, Opalescent teeth
without osteogenesis imperfecta, Dentinogenesis
imperfecta, Shields type II, Capdepont teeth
DENTINOGENESIS IMPERFECTA (DGI - 1)
● Shields type III, Brandywine type dentinogenesis
imperfecta
DENTINOGENESIS IMPERFECTA (DGI - 2)
● Directed primary towards preventing the loss of
enamel and subsequent loss of dentin through attrition
DENTINOGENESIS IMPERFECTA (TREATMENT)
● Aka Rootless Teeth
● A rare disturbance of dentin formation characterized
by normal enamel but atypical dentin formation with
abnormal pulpal morphology
DENTIN DYSPLASIA
