3种树脂表面处理技术对树脂核-玻璃离子水门汀粘接强度影响的实验研究

目的 比较3种表面处理的树脂核与玻璃离子水门汀间的剪切粘接强度，为临床上设计树脂核-全冠修复体时冠的粘接提供理论依据。方法 将30个树脂核试件块随机分为3组：金刚砂车针打磨（RDB）组、RDB加酸蚀剂酸蚀（RDBE）组、RDB加树脂粘接剂（RDBA）组，分别接受金刚砂车针打磨、RDB加酸蚀剂酸蚀、RDB加树脂粘接剂3种表面处理。将各组树脂核与玻璃离子水门汀粘接，经37 ℃恒温水浴24 h后，测试分析各组的剪切粘接强度，并通过扫描电镜依次观察树脂核表面形貌、粘接界面及粘接断面，记录粘接面破坏形式。结果 3组的树脂核表面形貌及粘接界面形貌不同，而粘接断面的断裂方式无统计学差异（P>0.10）。RDB组、RDBE组、RDBA组试件的剪切强度分别为（4.28±0.18）、（4.65±0.17）、（2.39±0.21）MPa，3组间的剪切强度具有统计学差异（P<0.01）。结论 树脂核表面处理对其与玻璃离子水门汀间的剪切粘接强度有影响。

Effects of three different surface treatments on bond strength between composite resin core and glass ionomer cement

Objective  To compare shear bond strength（SBS） between composite resin core（CRC） disposed with three different surface treatments and glass ionomer cement（GIC）, so that to provide theoretical basis for luting of crowns to CRC. Methods  According to three different surface treatments, thirty blocks of CRC were randomly and equally divided into three groups: Roughening with diamond grit bur（RDB）, RDB plus etching with GlumaR Etch 35 Gel （RDBE）, RDB plus coating with AdperTM Single Bond2 adhensive（RDBA）. All CRC were cemented with GIC. All specimens were preserved in 37 ℃ water for 24 h, then SBS tests for eight specimens in each group were performed using a universal testing machine at a constant crosshead speed of 0.5 mm·min-1. The surface topography of one CRC of each group was observed using field emission scanning electron microscope（FE-SEM） at 100 amplification. The interface between CRC and GIC was observed using FE-SEM at 500 amplification. Then the nature of failure was also recorded using FE-SEM at 25 amplification and the data were analyzed with a Kruskal-Wallis H test. Results  The surface topography of each group and the interface  between CRC and GIC observed using FE-SEM were significantly different, but significant differences on the nature of failure between groups were not found（P>0.10）. SBS of each group was （4.28±0.18）MPa for RDB, （4.65±0.17）MPa for RDBE, （2.39±0.21）MPa for RDBA, respectively（P<0.01）.
Conclusion  The SBS between CRC and GIC is affected by the surface treatments of CRC.