Kunwar Deepa, Koirala Ujjwal, Manandhar Archana, Subedi Sushil, Gurung Nisha
Department of Conservative Dentistry and Endodontics, Gandaki Medical College, Pokhara, Nepal.
Department of Oral and maxillofacial surgery, Gandaki Medical College, Pokhara, Nepal.
J Nepal Health Res Counc. 2021 Sep 6;19(2):259-263. doi: 10.33314/jnhrc.v19i2.3310.
An impacted tooth is a tooth which does not reach the occlusal plane even after two-thirds root formation. Conditions associated with impacted teeth include trismus, cystic lesions, and cervical caries of second molars. The objective of this study was to evaluate the occurrence of carious lesions in the distal aspect of the mandibular second molar and its association with the presence of mandibular third molars.
A cross-sectional study was conducted from September 2018 to September 2020. Approval was taken from the Institutional Review Committee with reference number 90/77/78. Orthopantomograms of patients aged 18 years or older were studied. Information on age, gender, mandibular second and third molars were recorded. Convenient sampling was done. Statistical analysis was done using Statistical Package for Social Sciences version 21.
A total of 626 radiographs were studied of which mesioangular impaction (35.3%) was the most prominent type and followed by horizontal impaction, causing distal caries in second molars. The age group between 20-40 years and female gender had the higher prevalence of distal caries in second molar teeth. There was a significant correlation between gender and cavity existence (p=0.00), between impaction and existence of decay (p=0.00), and depth of impaction with cavity formation (p=0.004).
A total of 31.8% of the patients with impacted mandibular third molars had distal cervical caries in second molars. Mesioangular type, female gender, type A were the prominent factors associated with distal caries in second molar teeth due to impacted third molars.
阻生牙是指即使在牙根形成三分之二后仍未萌出至咬合平面的牙齿。与阻生牙相关的情况包括牙关紧闭、囊性病变以及第二磨牙的颈部龋。本研究的目的是评估下颌第二磨牙远中面龋损的发生率及其与下颌第三磨牙存在的相关性。
于2018年9月至2020年9月进行了一项横断面研究。获得了机构审查委员会的批准，参考编号为90/77/78。对18岁及以上患者的曲面断层片进行了研究。记录了年龄、性别、下颌第二和第三磨牙的相关信息。采用方便抽样法。使用社会科学统计软件包第21版进行统计分析。
共研究了626张X线片，其中近中阻生（35.3%）是最主要的类型，其次是水平阻生，导致第二磨牙远中龋。20至40岁年龄组和女性下颌第二磨牙远中龋的患病率较高。性别与龋洞存在之间（p = 0.00）、阻生与龋坏存在之间（p = 0.00）以及阻生深度与龋洞形成之间（p = 0.004）存在显著相关性。
下颌第三磨牙阻生的患者中，共有31.8%的患者下颌第二磨牙远中颈部出现龋坏。近中阻生类型、女性、A型是与第三磨牙阻生导致的第二磨牙远中龋相关的主要因素。
