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目的:观察不同酸蚀方法处理牙面后对树脂加强型玻璃离子(resin-modified glass ionomercement,RMGIC)托槽粘接的影响。方法:将110颗人下颌前磨牙完全随机分为5组:空白对照组(A组)、35%磷酸酸蚀组(B组)、10%聚丙烯酸酸蚀组(C组)、自酸蚀光固化组(D组)和自酸蚀后冲洗组(E组),每组22颗牙。各组牙齿在经过不同处理后立即用树脂加强型玻璃离子粘接方丝弓托槽,经冷热循环试验后各组20颗进行抗剪切强度(SBS)测试并记录粘接残留指数(ARI),并对结果进行统计分析,另2颗牙用激光共聚焦显微镜(LSCM)观察纵剖面。结果:各组SBS和ARI差异有显著意义(P<0.05),其中B组[(9.429 5±2.176 4)MPa]和C组[(7.613 0±2.520 2)MPa]的SBS明显高于其他组,但粘接剂残留量也高于其他组;A组[(3.786 5±1.711 2)MPa]和D组[(4.1265±1.9664)MPa)]的SBS差别不大(P>0.05),E组[(5.7095±1.7787)MPa]略高于D组(P<0.05)。LSCM观察到C组的粘接界面形成细小的突触而D组的粘接界面存在薄膜。结论:用10%聚丙烯酸预处理牙面能提供适宜临床需求的正畸粘接强度,使用光固化自酸蚀处理剂(Adper TM Easyone,3M ESPE)并不能明显提高树脂加强型玻璃离子的粘接强度。
Objective: To observe the effects of different acid etching methods on the resin-modified glass ionomercement (RMGIC) brackets. Methods: 110 human mandibular premolar teeth were randomly divided into 5 groups: blank control group (group A), 35% phosphoric acid etching group (group B), 10% polyacrylic acid etching group (group C) Light-cured group (group D) and self-etching post-etching group (group E), each group of 22 teeth. The teeth of each group were treated with resin-reinforced glass ionomer adhesive wire brackets immediately after different treatments. Twenty pieces of each group were subjected to the anti-shear strength (SBS) test after hot and cold cycle test, and the adhesive residue index (ARI ), And the results were statistically analyzed, the other two teeth with a confocal laser scanning microscopy (LSCM) longitudinal section. Results: The differences of SBS and ARI in each group were significant (P <0.05). The SBS in group B [(9.429 5 ± 2.176 4) MPa] and group C [(7.613 ± 2.520 2) MPa] were significantly higher than those in other groups , But the residual amount of adhesive was also higher than other groups. There was no significant difference in SBS between group A (3.786 5 ± 1.711 2) MPa and group D (4.1265 ± 1.9664) MPa) (P> 0.05) [(5.7095 ± 1.7787) MPa] was slightly higher than that of D group (P <0.05). LSCM observed a small synapse in the bonding interface of group C and a thin film in the bonding interface of group D. CONCLUSIONS: Pretreatment of the tooth surface with 10% polyacrylic acid provides an orthodontic bond strength that meets the clinical needs and does not significantly improve the adhesion of the resin-reinforced glass ionomer using Adper TM Easyone (3M ESPE) Then strength.