CBCT study on root and root canal morphology of maxillary second permanent molars in the Guangfu popula⁃ tion in the Lingnan area

Abstract

Objective To research the root and root canal morphology of maxillary second permanent molars in the Guangfu population of the Lingnan area. Methods A total of 1220 maxillary second permanent molars were collected from the 723 CBCT images of the Guangfu population. The root and root canal configurations were observed and count⁃ ed, and the morphological characteristics and changes were compared and analyzed. Results The maxillary second permanent molars included 709 three⁃root molars, 417 double root molars, 68 single root molars and 26 four⁃root mo⁃ lars. The difference in the detection rate of each root type in different sex and age groups was not statistically significant (P > 0.05). Root canal morphdogy of maxillary second permanent molars: type Ⅷ (3⁃3) was the most common type of root canals in single root molars, accounting for 63.25%. Significant differences in the detection rates of canal configura⁃ tions were noted among the three subtypes of fused root canals in double root molars (P < 0.01). Root canal morphology of the mesiobuccal root of the three⁃root molars was mainly typeⅠ (1⁃1), significantly accounting for 78.84%. Signifi⁃ cant sex and age differences were noted in the detection rate of type Ⅰ and Ⅳ root canals (P < 0.01). In addition, 75.86% of maxillary second permanent molars had symmetrical roots, and 73.64% of the bilateral teeth had symmetrical roots and canals. Conclusion The root and root canal morphology of maxillary second permanent molars in the Guang⁃ fu population in the Lingnan area are different compared with other areas at home and abroad.

Keywords

• Maxillary second permanent molar，
• Tooth root，
• Root canal，
• CBCT，
• Guangfu population，