Morphology and Ginical Observation of the Maxillary Third Molar

Objective To study the relation between the number of the cusps and roots, roots and canals in the maxillary third molar to provide the reference for clinical reservation and reutilization. Methods wilh the electronic digital calipers, the third molar was measured. Through the pulp transparent specimen, the shape of canals was observed. Results The maxillary third molar's root was longer than the crown, the buccopalatal dimension was greater than the mesiodistal. The majority of their occlusal surfaces had three cusps, next four cusps. The third molars which had two or three cusps were most of fused roots, while those that had four or five cusps were most of double roots. The root canal systems were comparatively complex, but most of them were most of double three canals. Conclusion There was some regularity of cusps and roots, roots and canals in the maxillary third molar.