Triolo P T, Wefel J S, Jensen M E
Center for Clinical Studies, College of Dentistry, University of Iowa, Iowa City 52242.
Am J Dent. 1991 Oct;4(5):207-10.
This study examined the effect of fluoride-releasing core build-up materials upon both enamel and root demineralization in an artificial caries system. Thirty extracted human molars were randomly assigned to three treatment groups consisting of (1) conventional composite core build-up paste, (2) fluoridated core build-up paste and (3) glass cermet. Teeth were thermocycled 350 times between 5 degrees C and 55 degrees C using 30-second dwell times. Acid-resistant varnish was placed on the specimens to within 1 mm of the restoration and the teeth were subjected to an artificial-caries challenge at pH 4.2 for 72 hours. Teeth were then sectioned and the thin sections photographed using a polarized light microscope. Areas of the artificial-caries lesions were measured using a sonic digitizing pad. Mean lesion area (in arbitrary units from the digitizing pad) on enamel for Group 1 was 3.76 +/- 0.54; Group 2 was 2.53 +/- 1.17 and Group 3 was 2.32 +/- 0.68. Mean lesion area on root for Group 1 was 3.04 +/- 0.54; Group 2 was 2.34 +/- 0.58 and Group 3 was 2.51 +/- 0.53. ANOVA with Duncan's multiple range test of contrast indicates a significant difference (P less than 0.001) on both enamel (35 +/- 3%) and root (20 +/- 3%) between the non-fluoridated product and the two fluoridated products. There were no significant differences between Group 2 and 3.
This artificial caries study indicates that a fluoride-releasing core material may be of value in preventing demineralization of tooth structure adjacent to the restorative core material.
本研究在人工龋损系统中检测了释氟核桩修复材料对釉质和牙根脱矿的影响。30颗拔除的人磨牙被随机分为三组，分别为：（1）传统复合核桩修复糊剂；（2）含氟核桩修复糊剂；（3）玻璃陶瓷。牙齿在5℃至55℃之间进行350次热循环，每次保持30秒。在标本上距修复体1毫米以内的区域涂抹抗酸漆，然后将牙齿置于pH值为4.2的人工龋损环境中72小时。随后将牙齿切片，用偏光显微镜拍摄薄片照片。使用声波数字化仪测量人工龋损病变的面积。第1组釉质的平均病变面积（数字化仪的任意单位）为3.76±0.54；第2组为2.53±1.17，第3组为2.32±0.68。第1组牙根的平均病变面积为3.04±0.54；第2组为2.34±0.58，第3组为2.51±0.53。方差分析及邓肯多重极差检验对比表明，未含氟产品与两种含氟产品在釉质（35±3%）和牙根（20±3%）方面均存在显著差异（P＜0.001）。第2组和第3组之间无显著差异。
这项人工龋损研究表明，释氟核桩材料对于预防修复核桩材料附近牙体组织的脱矿可能具有重要价值。
