Department of Oral Medicine and Diagnostic Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Dental University Hospital, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Biomed Res Int. 2021 Aug 26;2021:1880750. doi: 10.1155/2021/1880750. eCollection 2021.
The objective of this study was to study the incidence of type of impaction of mandibular third molars based on the classifications of Pell and Gregory and Winter, which included angulation of the tooth and level of the occlusal surface of the third molar with respect to the second molar, respectively, in a sample of Saudi population in central region. In this retrospective study, orthopantomograms (OPGs) of 17760 patients were examined, who were reported by the Dental University Hospital (DUH) at King Saud University, Riyadh, Saudi Arabia, between the years 2016 and 2020. Out of 17760 radiographs, 2187 (12.31%) patients presented with at least one impacted third molar. Out of which, 1337 (7.52%) patients had bilateral impaction and 850 (4.78%) patients had unilateral impaction ( < 0.001). No gender predominance was noted in the impaction status ( > 0.05). In bilateral impaction, 671 were male (50.2%) and 666 were female (49.8%). Among unilateral impaction, 394 (46.4%) were male and 456 (53.6%) were female. Mesioangular angulation was the most common pattern of impaction (65%) followed by vertical angulation in both bilateral and unilateral impactions. Level A impaction was found to be highest in both bilateral and unilateral impactions which are 48.02% and 54.0%, respectively ( < 0.05). Our study highlights mesioangular impaction and level "A" as the most frequently encountered angulation and level of impaction in impacted teeth. This study result provides us useful data regarding the radiographic status of mandibular third molars in the population of Saudi Arabia.
本研究旨在研究沙特中部人群下颌第三磨牙阻生类型的发生率，依据 Pell 和 Gregory 以及 Winter 的分类，分别考虑牙齿的倾斜角度和第三磨牙与第二磨牙咬合面的水平位置。在这项回顾性研究中，检查了来自沙特阿拉伯利雅得沙特国王大学牙科大学医院（DUH）在 2016 年至 2020 年间报告的 17760 名患者的全景片（OPG）。在 17760 张射线照片中，2187 名（12.31%）患者至少有一颗阻生第三磨牙。其中，1337 名（7.52%）患者为双侧阻生，850 名（4.78%）患者为单侧阻生（<0.001）。阻生状态无明显性别优势（>0.05）。在双侧阻生中，671 名为男性（50.2%），666 名为女性（49.8%）。在单侧阻生中，394 名为男性（46.4%），456 名为女性（53.6%）。近中角倾斜是最常见的阻生模式（65%），其次是双侧和单侧阻生的垂直倾斜。在双侧和单侧阻生中，均发现 A 级阻生率最高，分别为 48.02%和 54.0%（<0.05）。我们的研究强调了近中角阻生和“水平 A”是最常见的阻生角度和水平。本研究结果为我们提供了有关沙特阿拉伯人群下颌第三磨牙放射学状况的有用数据。
