【摘要】 目的:观察不同脱矿程度人工釉质龋经渗透树脂治疗后其表面微硬度的提高程度。方法:制备牛牙釉质样本60个,随机分为6组,分别置脱矿液中脱矿10、20、30、40、50、60 d;然后用ICON渗透树脂对各组人工釉质龋病损部位进行处理;分别于脱矿前、脱矿后、渗透树脂后用韦氏微硬度仪检测各组病损表面的微硬度值,用3D激光扫描显微系统观察病损表面的形貌。结果:各组样本脱矿前表面微硬度值基本一致(P>0.05),脱矿后均明显降低(P<0.05);经渗透树脂处理后,病损表面微硬度均显著提高(P<0.05),但低于基线水平(P<0.05),依次为脱矿60 d<50 d<40 d<30 d<20 d<10 d,10、20、30、40 d各组间无显著性差异(P>0.05)外,其他各组间差异均有统计学意义(P<0.05)。抛光后的釉质表面无树脂残留。结论:渗透树脂能提高釉质龋病损表面的微硬度,但不能达到正常釉质的水平;提高程度与病损脱矿程度相关。更多还原

【Abstract】 AIM: To evaluate the effect of resin infiltration treatment on enamel surface microhardness (SMH) of artificial caries lesions. METHODS:60 bovine enamel specimens were divided into6 groups (n =10) and were demineralized for 10 d,20 d,30 d,50 d and 60 d (group 1,2,3,4,5,and 6) respectively. The caries lesions were etched with 37% phosphoric acid gel and infiltrated with ICON resin. The SMH of the specimens before and after demineralization,and after resin infiltration was determined by Laser Microscope 3D & Profile Measurement. RESULTS: The specimens of all groups exhibited the same baseline level of SMH (P> 0. 05). After demineralization,the SMH of all groups was time-dependently reduced (P< 0. 05). SMH in all groups incteased after resin infiltration and polishing (P< 0. 05),but not achieved to the baseline. No significant difference in the amount of SMH re-hardening was detected between each 2 of group 1,2,3 and 4. However,SMH in groups 5 and 6 was lower than in the other 4 groups. Resin on the caries lesion surface was completely removed by polishing. CONCLUSION: Resin infiltration can increase the SMH of caries lesions,but can not return to the baseline SMH. The re-hardning of the caries lesion is negtively related to the demineralization.更多还原