Bishara S E, Olsen M E, Damon P, Jakobsen J R
Department of Orthodontics, University of Iowa, Iowa City 52242-1001, USA.
Am J Orthod Dentofacial Orthop. 1998 Jul;114(1):80-7. doi: 10.1016/s0889-5406(98)70242-2.
The purpose of this study was to compare a new light-cured bonding system that used a hybrid adhesive containing a resin reinforced glass ionomer (Fuji Ortho LC, GC America, Inc.) with a more traditional light-cured bonding system (Transbond, 3M Unitek) that contained resin material only. Seventy-five recently extracted human molars were collected and stored in a solution of 0.1% (weight/volume) thymol. The teeth were randomly separated into five groups of 15 molars each: Group I--using Transbond adhesive system with the enamel etched and dried before bonding. Group II--using Fuji Ortho LC (FOLC) adhesive system with no etch and the enamel wet with water before bonding. Group III--using FOLC adhesive system with the enamel etched and wet with water before bonding. Group IV--using FOLC adhesive system with no etch and the enamel wet with saliva before bonding. Group V--using FOLC adhesive system with the enamel etched and wet with saliva before bonding. The shear bond strength was performed after thermal cycling between 5 degrees +/- 2 degrees C and 50 degrees +/- 2 degrees C for a total of 2000 cycles with the Zwick test machine (Zwick Gm bH & Co.). After debonding, the teeth and brackets were examined under x10 magnification to evaluate the site of bond failure and the presence of residual adhesive. The analysis of variance was used to determine whether significant differences existed between the various groups. The findings indicated that there were no statistically significant differences among the three experimental groups I, III, and V that had the enamel surface etched before bonding, regardless of the adhesive used or the enamel surface contamination with water or saliva. On the other hand, the two experimental groups that did not have the enamel etched before bonding (II and IV) had significantly lower bond strengths. In conclusion, etching the enamel surface is a critical variable that affects shear bond strength as well as bond failure location when using the new adhesive system.
本研究的目的是比较一种新型光固化粘结系统与一种更为传统的光固化粘结系统，前者使用含有树脂增强玻璃离子体的混合粘结剂（Fuji Ortho LC，美国GC America公司），后者仅含有树脂材料（Transbond，3M Unitek公司）。收集75颗近期拔除的人类磨牙，并保存在0.1%（重量/体积）麝香草酚溶液中。将牙齿随机分为五组，每组15颗磨牙：第一组——使用Transbond粘结系统，粘结前对釉质进行酸蚀和干燥处理。第二组——使用Fuji Ortho LC（FOLC）粘结系统，粘结前不进行酸蚀，釉质用水湿润。第三组——使用FOLC粘结系统，粘结前对釉质进行酸蚀并用水湿润。第四组——使用FOLC粘结系统，粘结前不进行酸蚀，釉质用唾液湿润。第五组——使用FOLC粘结系统，粘结前对釉质进行酸蚀并用唾液湿润。使用Zwick试验机（Zwick Gm bH & Co.）在5℃±2℃和50℃±2℃之间进行总共2000次循环的热循环后，进行剪切粘结强度测试。脱粘后，在10倍放大倍数下检查牙齿和托槽，以评估粘结失败部位和残留粘结剂的存在情况。采用方差分析来确定不同组之间是否存在显著差异。研究结果表明，在粘结前对釉质表面进行酸蚀的三个实验组（第一组、第三组和第五组）之间，无论使用何种粘结剂或釉质表面被水或唾液污染，均无统计学上的显著差异。另一方面，粘结前未对釉质进行酸蚀的两个实验组（第二组和第四组）的粘结强度明显较低。总之，在使用新型粘结系统时，酸蚀釉质表面是影响剪切粘结强度以及粘结失败位置的关键变量。
