Rimmer P A, Pitts N B
Orthodontic Section, Dental School, Park Pl., Dundee, Scotland.
Community Dent Oral Epidemiol. 1991 Aug;19(4):205-12. doi: 10.1111/j.1600-0528.1991.tb00147.x.
The aims of this study were to examine the influence upon reported caries status of: 1) employing different diagnostic thresholds and 2) using differing conventions for treating approximal surfaces which appeared overlapped on posterior bitewing radiographs. Caries prevalence data from a group of 211 Scottish schoolchildren aged 5-15 yr studied during a trial of elective temporary tooth separation in general dental practice in Scotland were used. In this "moderate" caries group, values for dmft/DMFT rose significantly (P less than 0.001) when the D1 diagnostic threshold (all grades of lesion accepted) was applied in comparison with the D3 threshold (only caries into dentine recognised); dmft increasing from 3.9 to 5.4 and DMFT increasing from 1.7 to 4.7. This demonstrated that an over-optimistic impression of overall caries levels may be given when only the D3 threshold is used uncritically. In this study the status of approximal surfaces which were overlapped on bitewing radiographs was assessed by direct clinical examination using the temporary elective tooth separation technique. The investigation showed that, for this juvenile population, most (81.8% mesial, 93.1% distal) overlapped approximal surfaces were sound. Significantly more mesial than distal surfaces were found to be overlapped.
1）采用不同的诊断阈值；2）对在后牙咬合翼片上显示重叠的邻面采用不同的处理规范。研究使用了来自一组211名5至15岁苏格兰学童的龋齿患病率数据，这些学童是在苏格兰普通牙科实践中的一项选择性临时牙齿分离试验期间进行研究的。在这个“中度”龋齿组中，与D3阈值（仅识别已龋入牙本质的龋齿）相比，应用D1诊断阈值（接受所有病变等级）时，dmft/DMFT值显著上升（P小于0.001）；dmft从3.9增加到5.4，DMFT从1.7增加到4.7。这表明，不加批判地仅使用D3阈值时，可能会对总体龋齿水平给出过于乐观的印象。在本研究中，通过使用临时选择性牙齿分离技术进行直接临床检查，评估了咬合翼片上重叠的邻面的状况。调查显示，对于这个青少年群体，大多数（近中面81.8%，远中面93.1%）重叠的邻面是健康的。发现近中面重叠的情况明显多于远中面。
