Department of Prosthodontics, Faculty of Dentistry, Thamar University, Dhamar, Yemen.
Department of Periodontics, Faculty of Dentistry, Thamar University, Dhamar, Yemen.
Sci Rep. 2024 Sep 30;14(1):22642. doi: 10.1038/s41598-024-73556-9.
The prevalence of teeth impaction varies substantially between different populations, and the impaction of third molars is the most commonly recorded. This study aimed to explore the prevalence and pattern of the third molars impactions among Yemeni population. This was a retrospective radiographic study conducted in Yemen between 2022 and 2023. The digital panoramic radiographs were collected from two major X-ray centers in Yemen. The angular position and depth of the impacted third molars were assessed according to the classifications of Winter and of Pell and Gregory, respectively. All radiographs were evaluated twice by one investigator in a two-week interval, and Kappa test was used for intra-rater reliability. Gender-wise differences, differences between both sides, and differences between maxilla and mandible were analyzed using Chi-squared tes with odds ratio (OR) for the risk of impaction. A P-value < 0.05 was considered significant. Panoramic radiographs of 6338 individuals were included. Their mean age was 35.1 ± 13.3 years andand 63.9% were females. A total of 25,352 sites (quadrants) were screened for the presence of thirds molars. Among which, 14,003 third molars (55.3%) were present in one or more sites. There were 1440 individuals (23%) with a total of 2828 impacted third molars (20% of the existing third molars). Females were less likely to have third molar impaction (OR = 0.46, CI = 0.4-0.52). Impaction of the mandibular third molars was significantly more frequent than the maxillary ones (OR = 1.15, CI = 1.04-1.26; P = 0.005). Horizontal and mesioangular impactions were statistically more frequent in the lower molars compared to the upper ones (P < 0.001 each). Contrastingly, vertical (P = 0.015), distoangular, and other impactions (P < 0.001 each)were statistically more frequent in the maxilla. Levels A and B were more frequent in the lower third molars, while level C was predominating in the upper molars (P < 0.001 each). The prevalence of third molars impaction is more frequent in males and mandibular arch. The angulation and level of impaction seem to be more complicated in the maxillary arch.
第三磨牙阻生的患病率在不同人群中有很大差异，其中第三磨牙阻生最为常见。本研究旨在探讨也门人群第三磨牙阻生的患病率和模式。这是一项在 2022 年至 2023 年期间在也门进行的回顾性放射研究。从也门的两个主要 X 射线中心收集数字全景射线照片。根据 Winter 和 Pell 和 Gregory 的分类，分别评估阻生第三磨牙的角度位置和深度。所有射线照片均由一名研究人员在两周间隔内进行两次评估，并使用 Kappa 检验评估内部评分者的可靠性。使用卡方检验（OR 用于评估阻生的风险）分析性别差异、两侧差异以及上颌骨和下颌骨之间的差异。P 值<0.05 被认为具有统计学意义。纳入了 6338 人的全景射线照片。他们的平均年龄为 35.1±13.3 岁，其中 63.9%为女性。共筛查了 25352 个（象限）部位是否存在第三磨牙。其中，14003 个第三磨牙（55.3%）存在于一个或多个部位。共有 1440 人（23%）共有 2828 个阻生第三磨牙（占存在的第三磨牙的 20%）。女性发生第三磨牙阻生的可能性较小（OR=0.46，CI=0.4-0.52）。下颌第三磨牙阻生的发生率明显高于上颌（OR=1.15，CI=1.04-1.26；P=0.005）。与上颌磨牙相比，水平和近中角阻生在下颌磨牙中更为常见（P<0.001）。相反，垂直（P=0.015）、远中角和其他阻生（P<0.001）在上颌磨牙中更为常见。A 级和 B 级在下颌第三磨牙中更为常见，而 C 级在上颌磨牙中更为常见（P<0.001）。第三磨牙阻生的患病率在男性和下颌弓中更为常见。上颌弓中阻生的角度和水平似乎更为复杂。
