牛牙的自然酸蚀与电化学人工龋的比较

Comparison of Acid Corrosion and Electrochemical Artificial Corrosion on Bovine Tooth

进行了牛牙的自然酸蚀和电化学人工龋的初步研究 ,结果表明 ,酸的作用只能使牙釉质脱矿 ,只有在酸和电的双重作用下 ,才能形成牙釉质的类龋洞 .在人工电化学腐蚀中 ,不同浓度的羧甲基纤维素 (CMC)致龋凝胶对Ca溶出量影响较大 ,以 0 .5 %CMC致龋凝胶龋损深度最大 ,牙的Ca溶出量为自然酸蚀的 3～ 4倍 .在人工电化学腐蚀中 ,阳极pH值呈下降趋势 ,阴极pH值呈上升趋势 ,氟化物能减少阳、阴极间pH差值 .氟化物在自然酸蚀和人工电化学腐蚀中均能显著抑制牙Ca的溶出 ,在开窗区几乎看不到脱矿现象 .

The study of acid corrosion and electrochemical artificial corrosion on bovine tooth was carried out. Results indicated that the effect of acid and electron current could promote dental demineralization and the formation of caries like cavities with lesions deep into dentin in electrochemical artificial caries model, but the effect of acid only could promote the demineralization of tooth. Different CM-cellulose sodium (CMC) concentration solution had a great influence on dissolution of Ca from tooth, 0.5% CMC was most suitable for electrochemical artificial model, the solution of Ca from tooth was two or three times to acid corrosion. The pH of the anoxic solution was tending to drop down and of the cathodic solution was tending to growth up on electrochemical artificial model. Fluoride could obviously inhibit demineralization.