Jensen M E, Garcia-Godoy F, Wefel J S
Am J Dent. 1990 Dec;3(6):295-8.
The purpose of this study was to examine artificial root caries when light-cured fluoride releasing liners were placed under amalgam restorations. Class V preparations in extracted third molars were used with gingival margins on root surfaces. Ten restorations were used for each of the following groups: 1) Amalgam alone; 2) Two layers of copal varnish and amalgam; 3) Vitrabond, amalgam; 4) Timeline, amalgam; 5) XR Ionomer, amalgam. The teeth were thermocycled and artificial caries were created using a liquid system acidified to pH 4.20 containing 2.2 mM calcium and phosphate but without fluoride. The teeth were sectioned, polished and photographed using polarized light. Areas of recurrent caries were measured using a sonic digitizing pad. The data were analyzed using ANOVA and Duncan's Multiple Range Test. Areas for root lesions for the different groups were: 1) 2.17 +/- 0.35; 2) 1.90 +/- 0.40; 3) 1.30 +/- 0.18; 4) 1.77 +/- 0.28; 5) 1.50 +/- 0.33. Groups 3 and 5 were statistically different from groups 1 and 2, while no differences were observed for enamel lesions. The use of the photo-activated/fluoride releasing liners significantly reduced lesion area.
本研究的目的是检查当光固化释氟衬层置于汞合金修复体下方时的人工根龋情况。在拔除的第三磨牙上制备V类洞，龈缘位于根面。以下每组使用10个修复体：1）仅汞合金；2）两层珂罗酊清漆和汞合金；3）Vitrabond、汞合金；4）Timeline、汞合金；5）XR离子体、汞合金。对牙齿进行热循环处理，并使用酸化至pH 4.20、含有2.2 mM钙和磷酸盐但不含氟化物的液体系统制造人工龋。将牙齿切片、抛光并使用偏光进行拍照。使用声波数字化板测量继发龋面积。使用方差分析和邓肯多重极差检验对数据进行分析。不同组的根面病变面积为：1）2.17±0.35；2）1.90±0.40；3）1.30±0.18；4）1.77±0.28；5）1.50±0.33。第3组和第5组与第1组和第2组在统计学上存在差异，而在釉质病变方面未观察到差异。使用光活化/释氟衬层可显著减少病变面积。
