医学资料-Root and Root Canal Morphology of the Human.pdfVIP

Review Article Root and Root Canal Morphology of the Human Permanent Maxillary First Molar: A Literature Review Blaine M. Cleghorn, DMD, MS,* William H. Christie, DMD, MS, FRCD(C),† and Cecilia C.S. Dong, DMD, BSc (Dent), MS, FRCD(C)† Abstract The objective of this study was to review the literature uccessful root canal therapy requires a thorough knowledge of root and root canal with respect to the root and canal systems in the Smorphology. It is generally accepted that the most common form of the permanent maxillary first molar. Root anatomy studies were di- maxillary first molar has three roots and four canals (1). The broad buccolingual vided into laboratory studies (in vitro), clinical root dimension of the mesiobuccal root and associated concavities on its mesial and distal canal system anatomy studies (in vivo) and clinical case surface is consistent with the majority of the mesiobuccal roots having two canals while reports of anomalies. Over 95% (95.9%) of maxillary there is usually a single canal in each of the distobuccal and palatal roots (1, 2). There first molars had three roots and 3.9% had two roots. is a wide range of variation in the literature with respect to frequency of occurrence of The incidence of fusion of any two or three roots was the number of canals in each root, the number of roots and incidence of fusion (1–63). approximately 5.2%. Conical and C-shaped roots and A number of factors contribute to the variation found in these studies. The root canals were rarely found (0.12%). This review con- canal morphology of teeth is often extremely complex and highly variable (1, 2, 9, 48) tained the