半导体激光美白脱矿与再矿化的扫描电镜观察

Scanning electron microscope observation of the demineralization and mineralization of the semiconductor laser

目的通过扫描电镜观察半导体激光美白和冷光美白时牙釉质脱矿情况及使用氟保护剂后的再矿化情况。方法选取因正畸拔除的新鲜前磨牙,分为正常组(A组)、半导体激光美白组(B组)、半导体激光美白再矿化组(C组)、冷光美白组(D组)、冷光美白再矿化组(E组);B组以35%的过氧化脲凝胶涂布牙釉质、半导体激光中的7W、20HZ、30S、1/2间断频率照射,C组为B组处理后牙釉质表面涂布氟保护剂静置5分钟;D组以35%的过氧化脲凝胶涂布牙釉质、冷光照射30分钟,E组为D组处理后牙釉质表面涂布氟保护剂静置5分钟;各组分别置于扫描电镜下观察。结果B组可见牙釉质少量脱矿、部分牙釉质呈熔融状态;C组可见脱敏剂分布平坦、脱落较少;D组可见牙釉质较多部分脱矿;E组可见脱敏剂有脱落、部分有裂痕。结论半导体激光美白由于时间短和激光的高热效应,可以减少牙釉质的脱矿现象;同时因为半导体激光对牙釉质的良好处理,可以更好的保留住术后脱敏剂,可以减少牙齿美白后敏感的发生。

Objective To observe enamel demineralization and mineralization after use of fluoride protective agent. Methods Orthodontic extraction fresh premolar teeth were choosen and divided into normal group（group A）, whitening by semiconductor laser group（group B） and semiconductor laser remineralization group（group C）,whitening by Cold light group（group D）, whitening by Cold light remineralization group（group E）. The group B with 35% urea peroxide coated enamel, semiconductor laser 7W 20 Hz, 30 s, 1/2 discontinuous frequency irradiation;group C was treated teeth enamel surface fluorine coating protective agent standing for 5 minutes after group B;group D with 35% urea peroxide coated enamel, cold light irradiation for 30 minutes; group E treated teeth enamel surface fluorine coating protective agent standing for 5 minutes after group D;each group were placed in the scanning electron microscope to observe. Results The group B showed enamel a small amount off the mine, part of the enamel were fused; group C showed desensitization agent distribution flat, less shedding; group D visible enamel more partial demineralization; Group E visible desensitization agent off, part of the rift. Conclusion The semiconductor laser whitening due to the short time and laser heat effect, can reduce enamel demineralization phenomena; at the same time because of semiconductor laser on enamel good treatment can better retain live after desensitization agent, can reduce the occurrence of sensitive teeth after whitening.