摘要
目的:研究表面封闭法对托槽粘接抗剪强度(shear bond strength,SBS)的影响。方法:将正畸拔除的20颗离体前磨牙切割成颊面牙片,用自凝塑料包埋,其颊面经TransbondTM Plus自酸蚀处理液酸蚀30 s后随机等量分为2组,①实验组:涂Filtek Flow1400A3流动复合树脂形成封闭层,TransbondTM XT复合树脂粘接托槽;②对照组:TransbondTM XT复合树脂粘接托槽。37℃恒温水浴48 h及冷热循环(5℃30 s,55℃30 s)1 000次后,以0.5 mm/min的速度对托槽SBS进行测试;10倍体视显微镜下观察托槽脱落后牙面树脂残留情况并进行评估。结果:实验组、对照组托槽SBS(MPa)平均是8.08±1.38、8.34±1.37,牙面树脂残留指数(resin remnant index,RRI)分别是:2.80±1.03、3.20±1.03,经检验,2组SBS、RRI差异无统计学意义。结论:表面封闭法不影响托槽粘接抗剪强度,能满足固定矫治需要。
Objective： To investigate the effects of surface sealing on the shear bond strength（SBS） of the brackets.Methods： Twenty extracted premolars for orthodontics were cut into the buccofacial teeth pieces and etched by TransbondTM Plus self-etching primers for 30 seconds firstly,then divided into two groups with 10 teeth pieces in each group randomly.① experiment group,the buccal surface of the enamel was sealed with Filtek Flow 1400A3 flowable composite resin before bracket bonding;②control group,the bracket was bonded to the buccal surface of the enamel directly.All specimens were stored in deionized water at 37 ℃ for 48 h,thermocycled for 1 000 times at 30-second intervals between 5 ℃ and 55 ℃ water baths,and debonded with a universal testing machine.The amounts of resin remaining on the teeth pieces after debonding by using the resin remnant index（RRI）,which were examined under 10×magnification stereo-microscope.Results：The SBS（MPa） between experiment group and control group was 8.08±1.38,8.34±1.37 respectively,whereas the RRI was 2.80±1.03,3.20±1.03 respectively.The SBS,RRI between experimental group and control group revealed no statistically significant differences.Conclusion： Surface sealing shows adequate bond strength,which is considered a clinically acceptable bond strength.The debonding of bracket is not affected by the surface sealing.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2010年第1期43-46,共4页
Journal of Practical Stomatology
关键词
表面封闭法
流动复合树脂
粘接抗剪强度
固定正畸
Surface sealing
Flowable composite resin
Shear bond strength
Fixed orthodontics
