Attin T, Zirkel C, Hellwig E
Department of Operative Dentistry and Periodontology, University of Freiburg, Germany.
Caries Res. 1998;32(5):344-50. doi: 10.1159/000016470.
The aim of the present in vitro study was to evaluate the influence of sodium fluoride solutions on brushing abrasion of eroded dentin. Dentin specimens were prepared from 60 bovine incisors. The specimens were embedded in acrylic resin, ground flat, polished and subsequently covered with tape exposing an area of 1.8 mm x 10.0 mm in the center of the exposed dentin. The samples were alternatingly stored in a demineralizing solution (5 min) and a remineralizing solution (1 min) for 5 times. The erosive soft drink Sprite light(R) served as a demineralizing solution and artificial saliva was used as a remineralizing solution. Prior to storage in artificial saliva 15 specimens were each treated for 1 min with 250 and 2,000 ppm fluoride solution, respectively. Fifteen specimens were treated with distilled water instead of the fluoride solution (= eroded controls). The remaining samples were neither eroded with the soft drink nor fluoridated (= uneroded controls). After each immersion in artificial saliva the specimens were submitted to abrasion in a toothbrushing machine. After 5 demineralization-remineralization brushing cycles the total amount of tooth wear due to erosion and subsequent abrasion was profilometrically evaluated. Statistical analysis revealed the significantly lowest wear in the uneroded controls and the highest amount of abrasion in the eroded controls. Application of the fluoride solutions increased the wear resistance of the eroded dentin specimens, showing significantly better protection by the high-concentration compared to the low-concentration solution. The susceptibility to abrasion of the eroded dentin specimens treated with the high-concentration fluoride solution did not differ significantly from the uneroded dentin samples. It is concluded that application of 2,000 ppm sodium fluoride solutions immediately before toothbrushing significantly reduces abrasion of eroded dentin in vitro.
本体外研究的目的是评估氟化钠溶液对侵蚀性牙本质刷牙磨损的影响。从60颗牛切牙制备牙本质标本。将标本嵌入丙烯酸树脂中，磨平、抛光，随后用胶带覆盖，在暴露的牙本质中心露出一个1.8毫米×10.0毫米的区域。将样本交替储存在脱矿溶液（5分钟）和再矿化溶液（1分钟）中5次。侵蚀性软饮料轻怡雪碧(R)用作脱矿溶液，人工唾液用作再矿化溶液。在储存在人工唾液之前，分别用250 ppm和2000 ppm的氟溶液对15个标本处理1分钟。15个标本用蒸馏水代替氟溶液处理（=侵蚀对照）。其余样本既未用软饮料侵蚀也未氟化（=未侵蚀对照）。每次浸入人工唾液后，将标本放入牙刷机中进行磨损测试。经过5次脱矿-再矿化刷牙循环后，通过轮廓仪评估由于侵蚀和随后的磨损导致的牙齿磨损总量。统计分析显示，未侵蚀对照中的磨损显著最低，侵蚀对照中的磨损量最高。应用氟溶液提高了侵蚀性牙本质标本的耐磨性，与低浓度溶液相比，高浓度溶液显示出显著更好的保护作用。用高浓度氟溶液处理的侵蚀性牙本质标本的磨损易感性与未侵蚀的牙本质样本没有显著差异。得出的结论是，在刷牙前立即应用2000 ppm的氟化钠溶液可显著降低体外侵蚀性牙本质的磨损。
