Читать книгу Handbook of Oral Pathology and Oral Medicine - S. R. Prabhu - Страница 113

 Anatomical fusion of tooth cementum with the alveolar bone:Mandibular primary first molars are frequently ankylosedAnkylosis of permanent teeth is uncommonA sharp solid note on percussion is noted, suggesting ankylosisPeriodontal ligament space is absent on radiographyIn many examples, the permanent successor is missingFigure 1.16 An extracted mandibular molar with three roots.