摘要
目的 :评价激光进行瓷面预处理对复合树脂修补烤瓷的粘接效果。方法 :分别用 8%氢氟酸及 3组能量参数的脉冲Nd :YAG激光 (15Hz、40mJ、0 6W ;15Hz、6 0mJ、0 9W ;15Hz、80mJ、1 2W)对烤瓷牙粘接表面进行照射 ,照射时间均为 1min ,涂硅烷液及活化剂后 ,粘接复合树脂。应用电子万能试验机测试复合树脂—烤瓷的抗剪切粘接强度。采用扫描电镜观察瓷处理面的形貌特征。结果 :激光 0 6W组、0 9W组、1 2W组及酸蚀组的抗剪切粘接强度分别为 8 6 1、14 0 7、11 2 2及 13 47MPa ,激光 0 6W组明显低于酸蚀组 ,两者具有统计学差异 ,而 0 9W组及1 2W组与酸蚀组则无显著性差异。扫描电镜显示经激光处理的瓷面粗糙不平 ,呈浅凹状及火山口状结构。结论 :在适当能量参数下 ,脉冲Nd :YAG激光可代替酸蚀进行烤瓷牙粘接面的预处理。
Objective: To evaluate the shear bond strength of composite resin bonded to pretreated porcelain surfaces by use of a pulsed Nd:YAG laser irradiation and by use of 8% hydrofluoric ecthing. Methods: Surfaces of porcelain were roughened with coarse diamonds until the opaque body porcelains were exposed. The samples were divided into four groups. Samples of the first group were etched with 8% hydrofluoric acid for 3min by following the manufacter′s instructions. Samples of the 2nd, 3rd and 4th groups were separately irradiated by a pulsed Nd:YAG laser of three energy parameters of 15Hz, 40mJ, 0 6W; 15Hz, 60mJ, 0 9W and 15Hz, 80mJ, 1 2W different respeetively, each specimen was irradiated for 1min. Then, silane coupling agent was equally placed on the treated surfaces for 3min, the activator was used on each surface. The adhesive was applied and light cured. The composite resin material was finally bonded to the treated porcelain surface, forming a 3mm×3mm×2mm resin mass. Samples were then tested for shear bond strength between the treated porcelain and composite resin by using a SWD 10 electric universal testing machine with a crosshead speed of 1mm/min until fracture. At the end of testing, the data was evaluated by using a two way analysis of variance (ANOVA) comparing the shear bond strengh. On the other hand, characteristic morphology of laser irradiated surfaces of porcelain was prepared and observed by a scanning electron microscopy. Results: The shear bond strength of laser groups of 0 6W, 0 9W, 1 2W and etching group was respectively 8 61, 14 07, 11 22 and 13 47MPa. There was no significantly difference among groups of laser 0 9W, 1 2W and the etching group. This suggested that irradiated on surfaces of porcelain by Nd:YAG laser at the above laser energy could attain the same effectiveness as hydrofluoric acid etching. But the shear bond strengh of \;laser 0 6W group was significantly lower than the etching group. It suggested that shear bond strengh would obviously decrease when laser energy was 0 6W or lower than this parameter, and had no use in treatment on porcelain surfaces compar ing to acid etching. SEM showed that porcelain surfaces irradiated by Nd:YAG laser exhibited rough, umbilicate, lava crater like structure. This structure helped to produce mechanical retention between resin composite and porcelain. Conclusion: The pulsed Nd:YAG laser could replace etching method to pretreat the fracture porcelain surfaces for bonding with composite resin at appropriate energy parameters.\;
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2000年第6期377-379,共3页
West China Journal of Stomatology
基金
广东省自然科学基金!资助项目 (编号 940 845 )
关键词
烧瓷
复合树脂
抗剪切粘接强度
ND:YAG激光
laser\ \ porcelain\ \ composite resin\ \ shear bond strength\ \ ectching\ \ scanning electron microscope
