Soós Balázs, Janovics Kata, Tóth Ákos, Di Nardo Mario Domenico, Szalma József
PhD Student and Assistant Lecturer, Department of Oral and Maxillofacial Surgery, Medical School, University of Pécs, Pécs, Hungary.
Assistant Lecturer, Department of Conservative Dentistry and Periodontology, University of Pécs, Pécs, Hungary.
J Oral Maxillofac Surg. 2020 Jul;78(7):1162.e1-1162.e8. doi: 10.1016/j.joms.2020.02.005. Epub 2020 Mar 6.
The aim of our study was to evaluate the correlations between mandibular third molar impaction status and mandibular angle and condylar fractures.
This retrospective cross-sectional study included patients with unilateral and isolated angle or condylar fractures. Patient records and panoramic radiographs were evaluated. The predictor variables included the presence, impaction status (Pell and Gregory [P&G] classification), and angulation (Winter classification) of the third molar. The outcome variable was the type of fracture, whereas other predictor variables included demographic factors such as age, gender, and fracture etiology. Bivariate (χ test) and logistic regression analyses were conducted to estimate the associations between variables and the outcome.
The sample was composed of 164 angle fracture (mean age, 31.6 ± 12.3 years; 83.5% male) and 115 condylar fracture (mean age, 41.9 ± 16.8 years; 76.5% male) patients. A third molar was present in 72.6% of the angle fracture group and 54.8% of the condylar fracture group (P = .002). Deep impactions (classes IC, IIC, IIIB, and IIIC) exhibited an odds ratio (OR) of 3.60 for angle fractures (P < .001). No association was found between tooth angulations and the type of fracture. According to logistic regression analysis, older age (adjusted OR, 1.05; 95% confidence interval [CI], 1.03 to 1.07), P&G class I impaction (OR, 1.86; 95% CI, 1.09 to 3.20), and P&G class A impaction (OR, 1.91; 95% CI, 1.12 to 3.24) were significantly associated with condylar fractures whereas the presence of a third molar (OR, 0.46; 95% CI, 0.28 to 0.76) or P&G class B impaction (OR, 0.287; 95% CI, 0.12 to 0.69) was associated with angular fractures.
P&G class II or III and class B impaction status was significantly associated with angle fractures, whereas missing or fully erupted (class IA) third molars significantly correlated with condylar fractures.
本研究旨在评估下颌第三磨牙阻生状态与下颌角及髁突骨折之间的相关性。
这项回顾性横断面研究纳入了单侧孤立性下颌角或髁突骨折患者。对患者记录和全景X线片进行评估。预测变量包括第三磨牙的存在情况、阻生状态（佩尔和格雷戈里[P&G]分类）及角度（温特分类）。结果变量为骨折类型，其他预测变量包括年龄、性别和骨折病因等人口统计学因素。进行双变量（χ检验）和逻辑回归分析以评估变量与结果之间的关联。
样本包括164名下颌角骨折患者（平均年龄31.6±12.3岁；83.5%为男性）和115名髁突骨折患者（平均年龄41.9±16.8岁；76.5%为男性）。下颌角骨折组中72.6%存在第三磨牙，髁突骨折组中54.8%存在第三磨牙（P = 0.002）。深度阻生（IC类、IIC类、IIIB类和IIIC类）在下颌角骨折中的优势比（OR）为3.60（P < 0.001）。未发现牙齿角度与骨折类型之间存在关联。根据逻辑回归分析，年龄较大（调整后OR为1.05；95%置信区间[CI]为1.03至1.07）、P&G I类阻生（OR为1.86；95%CI为1.09至3.20）和P&G A类阻生（OR为1.91；95%CI为1.12至3.24）与髁突骨折显著相关，而存在第三磨牙（OR为0.46；95%CI为0.28至0.76）或P&G B类阻生（OR为0.287；95%CI为0.12至0.69）与下颌角骨折相关。
P&G II类或III类及B类阻生状态与下颌角骨折显著相关，而缺失或完全萌出（IA类）的第三磨牙与髁突骨折显著相关。
