Nemcovsky C E, Libfeld H, Zubery Y
Section of Periodontology, Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Israel.
J Clin Periodontol. 1996 Sep;23(9):810-5. doi: 10.1111/j.1600-051x.1996.tb00616.x.
Root resorption of 2nd molars in proximity to non-erupted 3rd molars has been widely reported. The purpose of this study was to determine the prevalence of root resorption in second molars adjacent to non-erupted third molars. Its association to age and gender of the patient, location and inclination of the non-erupted third molar and to distal bone support of the 2nd molars was analyzed. A radiographic survey of 202 periapical radiographs taken in patients with clinically missing third molars was conducted. 3 examiners independently evaluated the radiographs and only those cases where at least 2 observers agreed were included in this report. Statistical analysis was performed on 186 radiographs. Associations were analyzed with the Pearson chi 2 test. Radiographic evidence of root resorption was found in 45 2nd molars (24.2%) of which 12 (6.5%) showed moderate to complete root resorption. Non-erupted tooth apical position and mesio-inclination of 60 degrees or more relative to the distal root of the second molar were significantly associated with root resorption (p = 0.01368 and p = 0.0194, respectively). Resorption was positively associated with age of patient (p = 0.00606). These results may support early extraction of impacted 3rd molars especially in cases with a mesio-angulation of 60 degrees or more and an apical location in proximity to the distal root of the 2nd molar.
靠近未萌出第三磨牙的第二磨牙牙根吸收现象已有广泛报道。本研究旨在确定与未萌出第三磨牙相邻的第二磨牙牙根吸收的患病率。分析了其与患者年龄和性别、未萌出第三磨牙的位置和倾斜度以及第二磨牙远中骨支持的关系。对202例临床第三磨牙缺失患者的根尖片进行了影像学调查。3名检查者独立评估这些根尖片，只有至少2名观察者意见一致的病例才纳入本报告。对186张根尖片进行了统计分析。采用Pearson卡方检验分析相关性。在45颗第二磨牙（24.2%）中发现了牙根吸收的影像学证据，其中12颗（6.5%）表现为中度至完全牙根吸收。未萌出牙的根尖位置以及相对于第二磨牙远中根60度或更大的近中倾斜与牙根吸收显著相关（分别为p = 0.01368和p = 0.0194）。吸收与患者年龄呈正相关（p = 0.00606）。这些结果可能支持早期拔除阻生第三磨牙，尤其是在近中倾斜度为60度或更大且根尖位置靠近第二磨牙远中根的情况下。
