氟保护漆对冷光美白后的牙釉质显微硬度及表面形貌的影响

Effect of fluor protector on morphology and microhardness of bleached enamel

摘要:

目的：评价氟保护漆对于冷光美白后的牙釉质显微硬度和表面形貌的影响。方法：选择40颗因正畸拔除的前磨牙，将其颊面中份制备成为表面约为5.0 mm×5.0 mm的釉质块，随机分为4组，分别为A、B、C、D组。A组在行冷光美白前、冷光美白术后即刻（未行氟保护漆处理时）、术后进行了氟保护漆处理后进行显微硬度的测定；所得数据进行统计学分析。B、C、D组均进行扫描电镜的观察，其中B组仅进行冷光美白而不涂氟保护漆，C组冷光美白术后涂布氟保护漆，D组不进行任何处理。结果：冷光美白术后，牙釉质的显微硬度与术前相比下降且差异有统计学意义（P<0.05）；冷光美白术后表面涂氟保护漆，牙釉质的显微硬度与冷光美白后不涂氟保护漆相比上升且差异有统计学意义（P<0.05）；而比较术前和涂氟保护漆后的显微硬度，则差异没有统计学意义（P >0.05）。在扫描电镜下观察，冷光美白后，牙釉质表面局部有溶解现象，可见散在的凹坑，出现类似脱矿的改变；在涂氟保护漆后，釉质表面变平，可见较多的沉积物。结论：冷光美白术后使用氟保护漆能够迅速恢复牙釉质的显微硬度和表面形貌。

Abstract:

Objective：To analyze the effects of fluor protector on microhardness and morphology of cold light bleached enamel. Meth－ods：Totally 40 premolars extracted for orthodontic reasons were selected，whose buccal surfaces were made into enamel slabs（5 mm×5 mm）. Those enamel slabs were subjected to group A，B，C and D randomly. Group A’s microhardness before bleaching，after bleach－ing and after using fluor protector were evaluated. Groups B，C and D were evaluated under scanning electronic microscopy. Group B was bleached，group C used fluor protector after bleaching and group D was taken as blank control group. Results：Microhardness of enamel was decreased significantly after bleaching compared with that before bleaching（P<0.05），microhardness of bleached enamel with fluor protector was higher than that without fluor protector，however，microhardness of enamel before bleaching and after using fluor protector were not statistically significant（P >0.05）. Scanning electronic microscopy（SEM） indicated the roughness of enamel surface was increased and some random depression spots became noticeable. After using fluor protector，the surface of enamel became less rough and sediments were seen. Conclusions：Using fluor protector after cold light bleaching makes the microhardness and mor－phology of enamel recover quickly.