Читать книгу Handbook of Oral Pathology and Oral Medicine - S. R. Prabhu - Страница 98

 Dens invaginatus:The permanent maxillary lateral incisors appear to be the most frequently affected tooth (90% of all cases)Maxillary posterior teeth: 6.5% of all casesMandibular teeth are very rarely affected

 May be associated with taurodontism, microdontia, gemination, supernumerary tooth and dentinogenesis imperfectaFigure 1.10 (a) Dens invaginatus; radiograph showing dens invaginatus in a peg lateral incisor(source: by kind permission of Professor Charles Dunlap, Kansas City, Kansas, USA).(b) Dens evaginatus; radiograph showing dens evaginatus. Note a tubercle extending outward from the occlusal surface of the premolar.

 Causes food debris deposits and renders tooth vulnerable to caries

 Dens evaginatus:More common in mandibular premolar teethMay be bilateral and symmetrical tubercles on the occlusal surfaces of posterior teeth or on lingual surfaces of lower anteriorSlight female sex predilectionCan cause malocclusion with opposing teethAbnormal wear and fracture of the tubercle may occur