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Abstract：
BACKGROUND: External surface resorption is pressure-induced resorption and occurs on the external surface of the root, pressure exerted by impacted teeth, is common causes of external surface resorption. Predictive risk factors of impacted supernumerary tooth-associated root resorption (ISTARR) mentioned in this article include supernumerary teeth and patient factors. To investigate the risk factors of impacted supernumerary tooth-associated root resorption and predict the incidence of root resorption.
METHODS: This restrospective study enrolled 324 patients with impacted supernumerary tooth. All Cone-Beam Computed Tomography (CBCT) data and patient information were divided into two groups (without tooth root resorption and with root resorption). CBCT images and patient information (age and gender) of 133 patients had adjacent tooth root resorption and 191 did not. seven variables were analysed using binary logistic regression.
RESULTS: Individual analysis of potential risk factors showed that age, crown mesiodistal direction, root formation, and odontotheca of the impacted supernumerary tooth were associated significantly with ISTARR. Binary logistic regression showed that impacted supernumerary tooth with odontotheca (Odd Ratio = 2.926), the crown is in the middle (Odd Ratio = 1.446), located at the middle third of the adjacent tooth root (Odd Ratio = 1.614), complete root development (Odd Ratio = 1.334), and patient\'s age (Odd Ratio = 1.261) were significantly associated with ISTARR risk.
CONCLUSIONS: The risk factors of root resorption can be detected and predicted early according to the features of supernumerary tooth and patient\'s age. Still, more prospective studies with larger sample size are needed to validate the result.
METHODS: This restrospective study enrolled 324 patients with impacted supernumerary tooth. All Cone-Beam Computed Tomography (CBCT) data and patient information were divided into two groups (without tooth root resorption and with root resorption). CBCT images and patient information (age and gender) of 133 patients had adjacent tooth root resorption and 191 did not. seven variables were analysed using binary logistic regression.
RESULTS: Individual analysis of potential risk factors showed that age, crown mesiodistal direction, root formation, and odontotheca of the impacted supernumerary tooth were associated significantly with ISTARR. Binary logistic regression showed that impacted supernumerary tooth with odontotheca (Odd Ratio = 2.926), the crown is in the middle (Odd Ratio = 1.446), located at the middle third of the adjacent tooth root (Odd Ratio = 1.614), complete root development (Odd Ratio = 1.334), and patient\'s age (Odd Ratio = 1.261) were significantly associated with ISTARR risk.
CONCLUSIONS: The risk factors of root resorption can be detected and predicted early according to the features of supernumerary tooth and patient\'s age. Still, more prospective studies with larger sample size are needed to validate the result.
摘要：
背景：外表面吸收是压力诱导的吸收，发生在根部的外表面，受影响的牙齿施加的压力，是外表面再吸收的常见原因。本文提到的影响多生牙相关牙根吸收（ISTARR）的预测风险因素包括多生牙和患者因素。探讨多生牙阻生牙根吸收的危险因素，预测牙根吸收的发生率。
方法：这项前瞻性研究纳入了324例多生牙阻生患者。所有锥束计算机断层扫描（CBCT）数据和患者信息均分为两组（无牙根吸收和牙根吸收）。133例患者的CBCT图像和患者信息（年龄和性别）有邻牙牙根吸收，191例没有。使用二元逻辑回归分析了七个变量。
结果：对潜在危险因素的个体分析表明，年龄，冠中远端方向，根形成,受累的多生牙的牙囊藻与ISTARR显着相关。二元logistic回归分析显示，多生牙患牙有牙囊(奇数比=2.926)，冠在中间(奇数比=1.446)，位于相邻齿根的中间三分之一（奇数比=1.614），完整的根发育(奇数比=1.334)，患者年龄(奇数比=1.261)与ISTARR风险显著相关。
结论：根据多生牙的特点和患者的年龄，可以早期发现和预测牙根吸收的危险因素。尽管如此，需要更多具有更大样本量的前瞻性研究来验证结果.
方法：这项前瞻性研究纳入了324例多生牙阻生患者。所有锥束计算机断层扫描（CBCT）数据和患者信息均分为两组（无牙根吸收和牙根吸收）。133例患者的CBCT图像和患者信息（年龄和性别）有邻牙牙根吸收，191例没有。使用二元逻辑回归分析了七个变量。
结果：对潜在危险因素的个体分析表明，年龄，冠中远端方向，根形成,受累的多生牙的牙囊藻与ISTARR显着相关。二元logistic回归分析显示，多生牙患牙有牙囊(奇数比=2.926)，冠在中间(奇数比=1.446)，位于相邻齿根的中间三分之一（奇数比=1.614），完整的根发育(奇数比=1.334)，患者年龄(奇数比=1.261)与ISTARR风险显著相关。
结论：根据多生牙的特点和患者的年龄，可以早期发现和预测牙根吸收的危险因素。尽管如此，需要更多具有更大样本量的前瞻性研究来验证结果.
