广州市991名老年人根面龋RCI值调查分析

目的：调查广州市老年人根面龋的患病状况。方法：采用分层多阶段抽样方法,选取广州市城区的3个区和郊区的2个县级市作为调查点,共调查广州市65-74岁组老年人991名。以根面龋指数（Rootcariesindex,RCI）分析其患病状况。结果：上颌第一磨牙发生根面龋的RCI值最高,其次是下颌第三磨牙和上颌尖牙。上颌近中面RCI值最高（3.99%）,其次为远中面（3.67%）;下颌唇颊面最高（2.33%）;全口远中面最高（2.89%）,其次是近中面（2.87%）。舌腭面RCI值均为最低。上颌各牙面RCI值高于下颌。大部分患根面龋的老年人仅累及1个根面（84.6%）,累及2个根面的占12.0%,累及3个及以上根面的发生率很低。就患牙数目而言,根面龋牙数1颗者占24.8%,2-7颗者占24.7%,8颗及以上者仅有0.6%。结论：在根面暴露的情况下,受根面龋侵袭比例最高的是上颌第一磨牙,其次是下颌第三磨牙和上颌尖牙;易感牙面为上颌邻面和下颌唇颊面;上颌牙患龋危险性高于下颌。

Analysis of RCI on Root Caries among 991 Older Adults in Guangzhou

Objective：To evaluate the status of root caries in elders from Guangzhou.Methods：Three urban subdistricts and two counties were selected from urban and suburb areas of Guangzhou respectively using a stratified multistage sampling.A total of 991 old people aged 65-74 years participated in this study.Oral examination was carried out by a calibrated examiner and RCI was used to analyze.Results：The 1st molars in the maxilla had the highest RCI values,followed by the 3rd molars in the mandible and canines in the maxilla.The results revealed that the highest values noted in the maxillary mesial surfaces were 3.99% and in the mandibular buccal surfaces were 2.33%.Considering the distribution in the mouth as a whole,the distal surfaces presented the highest values （2.89%）,followed by the mesial surfaces.The lowest values of the index were observed for lingual surfaces,not only in the maxilla and mandible,but also in the mouth as a whole.Besides,the average RCI of root surfaces in maxilla was higher than the corresponding root surfaces in mandible.Furthermore,majority of the elders with root caries had only one root surface affected （84.6%） and 12.0% had two root surfaces affected.Given the number of affected teeth,only one tooth affected accounted for 24.8%,whereas the ratio of eight or more teeth suffered from root caries was merely 0.6%.Conclusions：Under the circumstance of root surfaces exposed,the 1st molars in the maxillary arch were the most affected,followed by the 3rd molars in the mandibular arch and canines in the maxillary arch.Both the proximal surfaces in the maxilla and the buccal surfaces in the mandible were more likely to suffer from root caries.Besides,the average RCI of root surfaces in maxilla was higher than the corresponding root surfaces in mandible.