锥形线束CT应用于下颌第一前磨牙解剖系统的研究

doi:10.20047/j.issn1673-7210.2023.23.26

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Abstract Objective To study the morphological characteristics of the root and root canal of the first premolar of mandible by cone beam CT (CBCT) scanning. Methods The imaging parameters of the first premolar of mandible in 376 patients who underwent CBCT examination in Boai Hospital of Zhongshan, Guangdong Province from June 2021 to January 2022 were retrospectively analyzed, the imaging parameters included the number of roots, root canal classification, root length, root canal curvature, starting position of root sulcus, appearance of root sulcus, and intersection angle between the line of buccal pulp angle and buccal enamelo-cemental junction and the buccal-lingual enamelo-cemental junction (BB-BL). The differences of CBCT imaging parameters were compared in patients with different genders (188 males and 188 females) and different ages (126 patients aged 16-25 years, 90 patients aged ＞25-35 years, 73 patients aged ＞35-45 years, 51 patients aged ＞45-55 years, and 36 patients aged ＞55 years) and their correlation with gender and age were analyzed. The anatomical structure symmetry of the first premolar of mandible in patients with different sex, age, and number of roots was analyzed. Results Root canal length of the right mandibular first premolar in 376 patients was (15.19±1.55) mm; BB-BL was (38.10±6.14)°, and the proportion of single root, type Ⅰ root canal, secondary root curvature, and no root sulcus were higher. In 99 patients with the presence of root sulcus, the proportion of starting position of root sulcus which at 1/3 of the root tip, and the root sulcus which located at the mesial root were higher. There were significant differences in root canal classification, tooth root length, and BB-BL among different gender patients (P＜0.05). There was statistical significance in the appearance of root sulcus between different genders of patients with the presence of root sulcus (P＜0.05). The BB-BL of patients of different ages was compared, and the difference was statistically significant (P＜0.05). The age of male and female patients were both negatively correlated with BB-BL (r＜0, P＜0.05). The rate of root canal symmetry in patients with single root was higher than that in patients with double root, and the difference was statistically significant (P＜0.05). Conclusion The root and root canal morphology of the first premolar of mandible are different. CBCT is helpful to the examination of root and root canal morphology and can provide reference for root canal treatment.

Key words： The first premolar of mandible Root Root canal morphology Cone beam CT

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	ZHENG Wenwen QIU Xiaoling

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ZHENG Wenwen QIU Xiaoling. Study on the application of cone beam CT in the anatomic system of the first premolar of mandible[J]. 中国医药导报, 2023, 20(23): 119-124.

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https://www.yiyaodaobao.com.cn/EN/10.20047/j.issn1673-7210.2023.23.26 OR https://www.yiyaodaobao.com.cn/EN/Y2023/V20/I23/119

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