Le Son Hoang, Nguyen Nhut Minh, Nguyen Ngoc Thi-Bao, Nguyen Ly Thi-Bich
Department of Oral Surgery, Faculty of Odonto-Stomatology, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam.
Int J Dent. 2022 Mar 10;2022:8482209. doi: 10.1155/2022/8482209. eCollection 2022.
Prevalence of distal caries in mandibular second molars (M2Ms) and its relationship with impacted condition of the adjacent mandibular third molars (M3Ms) have been reported in some studies. The results, however, were ambiguous because of including all impaction types and using univariate analysis for statistics.
This study aimed to determine anatomical features of mesially/horizontally impacted mandibular third molars (M3Ms) that could predict distal caries in the adjacent mandibular second molars (M2Ms) using multivariable analysis.
The study sample consisted of 300 digital panoramic radiographs of patients who underwent impacted M3Ms extraction. Two independent researchers collected the following variables from 446 pairs of M2M-M3M: sex, age, status of distal caries in M2Ms, mesial angulation, and Pell-Gregory classification of M3Ms.
The prevalence of distal caries was 50.67%. Multivariable Firth's logistic regression analysis showed that age ( = 0.066, 95% CI = 0.023-0.113), mesial angulation (<30°: = -1.205, 95% CI = -1.955 to -0.499; >70°: = -0.730, 95% CI = -1.184 to -0.282), vertical position (level B: = 2.275; 95% CI = 0.015-7.175; level A: = 3.008; 95% CI = 0.755-7.905), and horizontal position (level II: = 1.515; 95% CI = 0.444-2.874; level I: = 1.423; 95% CI = 0.283-2.825) were significant variables after adjusting for sex in the final model for predicting distal caries ( < 0.05).
In conclusion, anatomical positions of impacted M3Ms, such as mesial angulation and Pell-Gregory classification were significant predictors of distal caries in M2Ms.
一些研究报道了下颌第二磨牙（M2M）远中龋的患病率及其与相邻下颌第三磨牙（M3M）阻生情况的关系。然而，由于纳入了所有阻生类型并采用单因素分析进行统计，结果并不明确。
本研究旨在通过多变量分析确定近中/水平阻生下颌第三磨牙（M3M）的解剖特征，这些特征可预测相邻下颌第二磨牙（M2M）的远中龋。
研究样本包括300例接受阻生M3M拔除患者的数字化全景X线片。两名独立研究人员从446对M2M-M3M中收集了以下变量：性别、年龄、M2M远中龋状况、近中倾斜度以及M3M的Pell-Gregory分类。
远中龋的患病率为50.67%。多变量Firth逻辑回归分析显示，在最终预测远中龋的模型中，调整性别因素后，年龄（=0.066，95%可信区间=0.023-0.113）、近中倾斜度（<30°：=-1.205，95%可信区间=-1.955至-0.499；>70°：=-0.730，95%可信区间=-1.184至-0.282）、垂直位置（B级：=2.275；95%可信区间=0.015-7.175；A级：=3.008；95%可信区间=0.755-7.905）和水平位置（Ⅱ级：=1.515；95%可信区间=0.444-至2.874；Ⅰ级：=1.423；95%可信区间=0.283-2.825）是显著变量（<0.05）。
总之，阻生M3M的解剖位置，如近中倾斜度和Pell-Gregory分类，是M2M远中龋的重要预测因素。
