20 - abnormalities in development of teeth. Abnormalities in the form of teeth - etiology. Types. Abnormalities in position of teeth - etiology, types. Localised abnormalities in tooth eruption

Types of abnormalities in tooth form

• concrescence

• Fusion

• gemination

• cusps of carabelli

• talon cusp

• dens evaginatus

• dens ivaginatus

• ectopic enamel

• dilaceration

• taurodontism

what is it and what causes it (etiology)? - Concrescence

• Cementum overlying 2 teeth joins together

• Trauma or crowding of the teeth

what is it and what causes it (etiology)? - Fusion

• 2 developing teeth merge into 1

• Trauma, genetics, developmental disturbance

what is it and what causes it (etiology)? - Gemination

• Developing tooth splits into 2 teeth

• Trauma, genetics, developmental disturbance

what is it and what causes it (etiology)? - Cusp of Carabelli

• Located on palatal surface of mesiolingual cusp of maxillary molar

• NO INFO

what is it and what causes it (etiology)? - Talon cusp

• located on surface of anterior teeth extending at least half the distance from the cementoenamel junction to the incisal edge

• NO INFO

what is it and what causes it (etiology)? - Dens evaginatus

• Cusp like elevations of enamel located in the central groove or lingual ridge of buccal cusp of permanent premolar or molar

• Exact etiology unknown but believed to be result of genetics or disruption of tooth formation

what is it and what causes it (etiology)? - Dens ivaginatus

• Tooth within a tooth, can be coronary or radicular

• Developmental disturbance in tooth formation resulting in invagination of epithelium

what is it and what causes it (etiology)? - Ectopic enamel

• Presence of enamel in unusual places

• NO INFO

what is it and what causes it (etiology)? - Dilaceration

• Sharp bend or curve in root or crown of tooth

• Displacement injury or due to presence of abscess or tumour

what is it and what causes it (etiology)? - Taurodontism

• Occurs in multi rooted teeth, bull like teeth without apical taper and rectangular in shape

• Down syndrome, orofacial syndrome, amelogenesis imperfecta type 4

Abnormalities in the position of teeth

• diestema

• rotation

• displacement

• ectopic tooth

localised abnormalities in tooth eruption

• impacted - teeth that cease to erupt due to physical obstruction

• Embedded - teeth that cease to erupt due to lack of eruptive force

• Ankylosis - teeth that cease to erupt due to anatomic fusion of tooth with alveolar bone

Ankylosis

• teeth that cease to erupt due to anatomic fusion of tooth with alveolar bone

Embedded

• teeth that cease to erupt due to lack of eruptive force

impacted

• teeth that cease to erupt due to physical obstruction