Department of Oral and Maxillofacial Surgery, Cumhuriyet University, Dental School, Sivas, Turkey.
Int J Oral Maxillofac Surg. 2009 Dec;38(12):1279-82. doi: 10.1016/j.ijom.2009.07.007. Epub 2009 Aug 7.
The aim of this study was to evaluate the prevalence of second molar distal caries in a Turkish population and to determine the factors that affect it. Clinical records and panoramic radiographs of partially erupted mandibular third molars were reviewed in this retrospective study. The analysis outcome measures were the patients' age, second molar distal caries, third molar angulation and second and third molar contact point localization. Prevalence of second molar distal caries in the population was 20%. This prevalence was 47% when the third molar had an angulation of 31-70 degrees (majority of mesioangular third molars) and 43% at 70-90 degrees (all horizontal third molars). The contact point on the second molar amelocemental junction and increasing age had significant effects on caries formation. The results revealed that second molar distal caries justifies prophylactic third molar removal and partially erupted third molars that have an angulation of 30-90 degrees with a contact point on the amelocemental junction should be removed to prevent second molar distal caries.
本研究旨在评估土耳其人群中下颌第二磨牙远中龋的患病率，并确定影响其发生的因素。在这项回顾性研究中，查阅了部分萌出的下颌第三磨牙的临床记录和全景片。分析的结果测量指标包括患者的年龄、第二磨牙远中龋、第三磨牙倾斜角度以及第二和第三磨牙接触点的定位。人群中第二磨牙远中龋的患病率为 20%。当第三磨牙倾斜角度为 31-70 度（大多数为近中阻生第三磨牙）时，其患病率为 47%，而倾斜角度为 70-90 度（所有水平位第三磨牙）时，患病率为 43%。第二磨牙牙釉牙骨质交界处的接触点和年龄的增加对龋病的形成有显著影响。结果表明，第二磨牙远中龋支持预防性拔除第三磨牙，对于倾斜角度为 30-90 度且接触点位于牙釉牙骨质交界处的部分萌出第三磨牙，应予以拔除，以预防第二磨牙远中龋的发生。
