牙本质保护膜对牙本质小管的封闭作用**

背景：有临床研究报道牙本质保护膜在用于烤瓷全冠牙体预备后牙本质面的保护处理后,能有效降低基牙敏感度。 目的：体外实验观察牙本质保护膜封闭牙本质小管的效果。 方法：将20颗完好离体人前磨牙分为3组：空白对照组牙本质表面不作任何处理,对照组牙本质表面涂布格鲁玛脱敏剂,实验组牙本质表面涂布牙本质保护膜,在扫描电镜下观察牙本质小管口封闭情况。 结果与结论：扫描式电子显微镜观察显示,实验组牙本质小管口密度和直径均明显低于对照组与空白对照组(P < 0.05),牙本质小管口相对面积明显低于空白对照组(P < 0.01)。表明牙本质保护膜在减小牙本质小管的密度和直径方面的作用优于格鲁玛脱敏剂。

Effect of hybrid coat on the closing of dentinal tubules

BACKGROUND: Clinical studies have reported that hybrid coat used for porcelain crown dentin after tooth preparation surface protection treatment can effectively reduce the base tooth sensitivity. OBJECTIVE: To in vitro observe the effect of hybrid coat on the closing of dentin tubules. METHODS: A total of 20 intact extracted premolar teeth were divided into three groups. Black control group without any treatment on dentin surface. Gluma coating agent was used for control group. Hybrid coat was used for experimental group, and then the closing situation of the dentinal tubules was observed under scanning electron microscopy. RESULTS AND CONCLUSION: The results of scanning electron microscopy showed that the average diameter and density of the dentinal tubules in the experimental group were significantly lower than those in the control and the blank control groups (P < 0.05), relative area of the dentinal tubules in the experimental group was significantly lower than that in the blank control group (P < 0.01). It is indicated that the hybrid coat is superior to gluma coating agent in decreasing density and diameter of dentinal tubules.