两种脱敏剂对牙本质小管封闭作用及其耐磨性研究

The sealing effects and abrasive resistance of two desensitizers for dental tubules:an SEM investigation

目的探讨新型脱敏剂ClinproTMXT Varnish和奥威尔对牙本质小管的封闭作用及其耐磨性。方法收集2013年10-11月在南京大学医学院附属口腔医院口腔外科门诊因正畸需要拔除的无龋坏、无缺损新鲜离体前磨牙48颗,制备成牙本质盘标本,随机分为3组。A组:空白对照组;B组:ClinproTMXT Varnish组;C组:奥威尔组,每组16个。A组不做任何处理;B、C组分别按照脱敏剂使用说明书对暴露的牙本质表面进行处理,并且每组选取8个标本进行刷牙磨耗试验,然后用扫描电镜分别对各组标本的牙本质表面和纵剖面进行观察,并用Image-Pro Plus 6.0图像分析软件量化分析。结果 B组和C组标本均能在牙本质表面形成有效封闭,两组间的牙本质小管面积及相对面积差异无统计学意义(P>0.05),并且两组脱敏剂都可渗入牙本质小管内达一定深度,B组渗入深度明显大于C组(P<0.05);牙刷磨耗试验后,B组牙本质表面的封闭性明显优于C组(P<0.05)。结论 ClinproTMXT Varnish对牙本质小管的封闭作用及其耐磨性较奥威尔更佳。

Objective To evaluate the the sealing effects and abrasive resistance of ClinproTM XT Varnish and Oravive through scanning electron microscope （SEM）. Methods Totally 48 freshly extracted human premolars were selected, prepared into dentin discs, and randomly divided into 3 groups （group A： control group, group B： ClinproTM XT Varnish group,group C： Oravive group）. ClinproTM XT Varnish and Oravive were applied respectively on the exposed dentin surfaces of the B and C group in accordance with operating manual. Eight teeth of the B and C group were respectively selected for toothbrush abrasion test. Then an observation was made on the surface and the section plane by scanning election microscope and quantitative analysis was made with Image-Pro Plus 6.0. Results Both of the two desensitizers could occlude the dentinal surface, and dentinal tubule area and the relative area of the two groups had no significant difference （P 〉 0.05）. The two desensitizers could penetrate into the dentinal tubules at a certain depth, but the penetration depth in group B was larger than that in group C （P 〈 0.05）; after the toothbrush abrasion test, the sealing effect in group B was markedly superior to that in group C （P 〈 0.05）. Conclusion ClinproTM XT Varnish performs better than Oravive in sealing effect and abrasion resistance.