不同前期处理方法对Icon树脂渗透修复早期龋效果影响的研究

Research of Icon resin infiltrates to repair initial enamel lesions with various pre-treatment methods

目的通过对人工釉质龋进行不同方法处理,观察Icon的渗透效果。方法选取正畸拔除完好的第一前磨牙和第一磨牙32颗,置于人工脱矿液中14 d形成早期人工釉质龋。再随机分成4组,各组龋损表面分别用15%盐酸、37%磷酸和Opalustre打磨处理后,荧光素钠(NaFl)染色,Icon树脂渗透和光固化处理。激光扫描共聚焦显微镜(CLSM)镜下观察,比较4种处理方法对渗透的影响。结果盐酸组和磷酸组在渗透深度上存在显著性差异(P<0.05),盐酸组渗透效果更好;两打磨组间渗透深度存在显著性差异(P<0.05),提高打磨时间可以提高渗透效果,打磨组2与磷酸组、盐酸组均存在显著性差异(P<0.05),采用Opalustre打磨40 s后,Icon的渗透效果更好。结论龋表面的高钙化层是阻碍Icon渗透治疗的一道屏障,盐酸处理后Icon的渗透效果优于磷酸处理,而通过打磨表面层40 s后的渗透效果又明显优于20 s处理。早期龋表层的打磨处理可以考虑作为Icon临床治疗前期处理的替代和补充。

Objective Various approaches were adopted to treat the surfaces of artificial demineralized enamel lesions. By observing the penetration effects we could get more viable foundation for the clinical application. Methods 32 intact first premolars and first mo- lars were selected from orthodontic extraction. They were placed in the artificial demineralization solution for 14 days to form initial arti- ficial enamel caries. The teeth were divided into four groups randomly, and surfaces of teeth in each group were dealed with 15 % hydro- chloric acid,37% phosphate and polished by Opalustre,stained by NaFl,penetrated with Icon and processed with light solidification. Observed under CLSM microscope, the impact of four treatment methods on penetration depths was compared. Results There were sig- nificant differences in depths of penetration between hydrochloric acid group and phosphoric acid group （ P 〈 0.05 ）. The hydrochloric acid group got a better result. There were significant differences between the two polished groups in the depths of penetration （P 〈 0.05）. Increasing grinding time could increase the penetration effect. There were significant differences in penetration depths between polished group 2 and hydrochloric acid group or phosphoric acid group（ P 〈 0.05 ）. Polishing 40 seconds with Opalnstre produced a bet- ter result. Conclusions The highly calcified layer is a barrier impeding the Icon to penetrate. The penetration effect of the hydrochloric acid treatment is better than that of the phosphoric acid treatment. By grinding for forty seconds of the barrier,the penetration effect is significantly better than that dealt for twenty seconds. So grinding can be considered as an alternative or a complement of pretreatment method in clinical treatment.