Department of Oral Medicine, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran.
Med Oral Patol Oral Cir Bucal. 2013 Jan 1;18(1):e140-5. doi: 10.4317/medoral.18028.
The aim of this study is to evaluate the position of impacted third molars based on the classifications of Pell & Gregory and Winter in a sample of Iranian patients.
In this retrospective study, up to 1020 orthopantomograms (OPG) of the patients who were referred to the radiology clinics from October 2007 to January 2011 were evaluated. Data including the age, gender, the angulation type, width and depth of impaction were evaluated by statistical tests.
Among 1020 patients, 380(27.3%) were male and 640(62.7%) were female with the sex ratio was 1:1.7. Of the 1020 OPGs, 585 cases showed at least one impacted third molar, with significant difference between males (205; 35.1%) and females (380; 64.9%) (P = 0.0311). Data analysis showed that impacted third molars were 1.9 times more likely to occur in the mandible than in the maxilla (P =0.000). The most common angulation of impaction in the mandible was mesioangular impaction (48.3%) and the most common angulation of impaction in the maxilla was the vertical (45.3%). Impaction in the level IIA was the most common in both maxilla and mandible. There was no significant difference between the right and left sides in both the maxilla and the mandible.
The pattern of third molar impaction in the southeast region of Iran is characterized by a high prevalence of impaction, especially in the mandible. Female more than male have teeth impaction. The most common angulation was the mesioangular in the mandible, and the vertical angulation in the maxilla. The most common level of impaction was the A and there was no any significant difference between the right and left sides in both jaws.
本研究旨在通过佩尔-格雷戈里（Pell & Gregory）和温特（Winter）分类法评估伊朗患者中阻生第三磨牙的位置。
在这项回顾性研究中，评估了 2007 年 10 月至 2011 年 1 月期间向放射科诊所转诊的患者的多达 1020 张全景片（OPG）。通过统计学检验评估了包括年龄、性别、倾斜类型、阻生深度和宽度的数据。
在 1020 名患者中，男性 380 例（27.3%），女性 640 例（62.7%），男女比例为 1:1.7。在 1020 张 OPG 中，有 585 例至少有一颗阻生第三磨牙，男性（205 例；35.1%）和女性（380 例；64.9%）之间存在显著差异（P=0.0311）。数据分析显示，下颌中阻生第三磨牙的发生概率是上颌的 1.9 倍（P=0.000）。下颌中最常见的阻生角度为近中倾斜（48.3%），上颌中最常见的阻生角度为垂直（45.3%）。上颌和下颌中最常见的阻生水平为 IIA 级。上颌和下颌左右两侧之间没有显著差异。
伊朗东南部地区第三磨牙阻生的模式以高发率为特征，尤其是在下颌。女性比男性更易发生牙齿阻生。下颌最常见的倾斜角度为近中倾斜，上颌最常见的倾斜角度为垂直。最常见的阻生水平为 A 级，上下颌左右两侧之间没有任何显著差异。
