Читать книгу Handbook of Oral Pathology and Oral Medicine - S. R. Prabhu - Страница 41

 Tooth count:Individuals with gemination have a normal tooth count. Clinically seen as double teeth but radiograph shows common root canal (Figure 1.4a,b)Individuals with fusion show a missing tooth due to the union of two teeth. Clinically seen as a large tooth crown (Figure 1.4c)Individuals with concrescence have a normal tooth count. Roots of two teeth are joined by cementum (Figure 1.4d)

 Gemination: more common in the maxilla

 Fusion: more common in the mandible

 Concrescence: common in posterior maxillary region. Often, second molar roots are joined with adjacent impacted third molar roots

 Gemination and fusion in deciduous teeth may cause crowding, abnormal spacing or delayed eruption of permanent teeth