歯科用コーンビームCT画像における日本人の歯根と根管形態の観察

—上顎小臼歯部—

抄録

Abstract : Purpose : The aim of this study was to evaluate the number of roots and root canal configurations of maxillary premolars in a Japanese population using dental cone-beam computed tomography (CBCT).

 Materials and methods : We analyzed the CBCT images of 267 maxillary first premolars and 266 second premolars from a total of 145 patients for the following parameters : (1) the number of roots and root canals ; and (2) the classification of each root canal configuration based on Vertucci's classification.

 Results : A majority of the maxillary premolars were found to have one root (74.2% of first premolars and 97.7% of second premolars), followed by two roots (24.3% of first premolars and 2.3% of second premolars), with three roots identified in only 1.5% of the first premolars. Regarding root canal configuration, Vertucci's typeⅡ and Ⅳ configurations for single-rooted maxillary first premolars, and typeⅠ and Ⅱ configurations for single-rooted second premolars were the most prevalent. Furthermore, all types of root canal configurations were observed in the single-rooted maxillary first premolars, with the exception of type Ⅵ.

 Conclusion : The maxillary first premolars exhibited a high degree of variability and complexity in their root canal system. In contrast, the number of roots and root canal configurations of maxillary second premolars showed a lower degree of variability compared to the first premolars.