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中华口腔医学研究杂志(电子版) ›› 2021, Vol. 15 ›› Issue (01) : 13 -17. doi: 10.3877/cma.j.issn.1674-1366.2021.01.003

所属专题: 文献

临床研究

锥形束CT评估与下颌阻生第三磨牙相关的第二磨牙远中牙槽骨缺损的危险因素
曾素云1, 郭凤芹1, 王建广2,()   
  1. 1. 安徽医科大学合肥口腔临床学院 合肥市口腔医院西区牙周科 230000
    2. 中山大学孙逸仙纪念医院口腔颌面外科,广州 510120
  • 收稿日期:2020-08-18 出版日期:2021-02-01
  • 通信作者: 王建广

Evaluation of risk factors of the distal alveolar bone resorption of the second molar associated with impacted mandibular third molar by cone-beam computed tomography

Suyun Zeng1, Fengqin Guo1, Jianguang Wang2,()   

  1. 1. Hefei School of Stomatology, Anhui Medical University; Department of Periodontology, Stomatological Hospital of Hefei, Hefei 230000, China
    2. Department of Oral & Maxillofacial Surgery, Sun Yat-sen University, Guangzhou 510120, China
  • Received:2020-08-18 Published:2021-02-01
  • Corresponding author: Jianguang Wang
  • Supported by:
    National Natural Science Foundation of China(30872891)
引用本文:

曾素云, 郭凤芹, 王建广. 锥形束CT评估与下颌阻生第三磨牙相关的第二磨牙远中牙槽骨缺损的危险因素[J/OL]. 中华口腔医学研究杂志(电子版), 2021, 15(01): 13-17.

Suyun Zeng, Fengqin Guo, Jianguang Wang. Evaluation of risk factors of the distal alveolar bone resorption of the second molar associated with impacted mandibular third molar by cone-beam computed tomography[J/OL]. Chinese Journal of Stomatological Research(Electronic Edition), 2021, 15(01): 13-17.

目的

使用锥形束CT(CBCT)评估与下颌阻生第三磨牙(MTM)相关的第二磨牙(MSM)远中牙槽骨缺损的危险因素。

方法

在这项横断面研究中,选择2018年1月至2020年1月就诊于合肥市口腔医院的124例因临床治疗需要拍摄CBCT的患者进行了回顾性研究,其中男67例、女57例,年龄18 ~ 65岁,平均32.5岁。CBCT测量MSM远中牙槽骨缺损深度、远中根长度,计算MSM远中牙槽骨缺损程度。统计患者的性别、年龄、观察部位、MTM阻生深度、MTM/MSM轴倾角和接触类型,并将其与MSM远中牙槽骨缺损程度进行非参数秩和检验验分析。

结果

(1)124例研究病例中,MTM以近中倾斜阻生最多(41.1%),中位阻生较多见(49.2%);107例(86.3%)MTM/MSM紧密接触,接触点大多位于MSM根的中部(41.1%);在多数情况下存在MSM远中牙槽骨吸收(n = 108,87.1%),其中主要是中度牙槽骨缺损(n = 68,54.8%);(2)不同年龄(χ2 = 7.807,P = 0.02)、MTM阻生深度(χ2 = 11.397,P = 0.003)、MTM/MSM轴倾角(χ2 = 16.835,P = 0.001)和接触位置(χ2 = 20.331,P<0.001)的MSM远中牙槽骨缺损程度差异均有统计学意义。

结论

由阻生MTM引起的MSM远中牙槽骨缺损较为多见,其危险因素与年龄、MTM阻生深度、MTM/MSM轴倾角和接触位置密切相关。

Objective

To analyze the risk factors affecting the distal alveolar bone resorption of the second molar associated with impacted mandibular third molar by cone-beam computed tomography (CBCT) .

Methods

CBCT data were collected from 124 patients in Stomatological Hospital of Hefei, from Jan. 2018 to Jan. 2020. There were 67 males and 57 females with an average age of 32.52 years, ranging from 18 to 65 years old. The depth of distal alveolar bone defect and the length of distal root were measured by CBCT, and the degree of distal alveolar bone defect of MSM was calculated. A comparative analysis of the impactions of different factors in terms of gender, age, depth of impacted MTM, MTM tendency, MTM/MSM contact type and observation site of patients on the extent of distal alveolar bone resorption was conducted withnon-parametric Kruskal-Wallis test.

Results

(1) Among the 124 study cases, themisally inclined (41.1%) and median impaction (49.2%) of MTM were more than the other types of impactions. Besides, 107 cases of MTM/MSM (86.3%) were in a tight contact, and the contact point was mostly located in the middle of MSM root (41.1%) . (2) The influences on the degree of distal alveolar bone defect with different age (χ2 = 7.807, P = 0.02) , depth of impacted MTM (χ2 = 11.397, P = 0.003) , MTM tendency (χ2 = 16.835, P = 0.001) and MTM-MSM contact type (χ2 = 20.331, P<0.001) were significantly different.

Conclusions

Distal alveolar bone defect of MSM caused by MTM is very common, and its risk factors are closely related to age, depth of impacted MTM, inclination angle of MTM/MSM axis and contact position.

图1 锥形束CT图像显示不同程度的下颌第三磨牙远中牙槽骨缺损 A:轻度缺损;B:中度缺损;C:重度缺损
表1 124例研究病例中潜在变量与下颌第二磨牙远中牙槽骨缺损程度的关系
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