Moghaddas Mohammad Javad, Hossainipour Zahra, Majidinia Sara, Ojrati Najmeh
Department of Operative Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
Electron Physician. 2017 Aug 25;9(8):4985-4991. doi: 10.19082/4985. eCollection 2017 Aug.
The aim of the present study was to determine the shear bond strength of self-adhesive resin cements to enamel and dentin with and without surface treatments, and compare them with conventional resin cement as the control group.
In this experimental study, buccal and lingual surface of the thirty sound human premolars were polished in order to obtain a flat surface of enamel (E) in buccal, and dentin (D) in lingual. Sixty feldspathic ceramic blocks (2×3×3 mm) were prepared and randomly divided into six groups (n=10). Each block was cemented to the prepared surface (30 enamel and 30 dentin surface) according to different protocol: E1 and D1; RelyX ARC as control group, E2, D2; RelyX Unicem, E3, D3; acid etching +RelyX Unicem. The specimens were termocycled and subjected to shear forces by a universal testing machine at a cross head speed of 0.5 mm/min. The mode of fracture were evaluated by stereomicroscope. Data were analyzed with descriptive statistical methods using SPSS version 15. One-way ANOVA, and post hoc Tukey tests were used to compare bond strengths between the groups with different adhesives at α=0.05.
Statistical analysis showed no significant differences within the enamel subgroups, but there were significant differences within the dentinal subgroups, and statistically significant differences were found between the groups D1and D3 (p=0.02). Comparison between similar enamel and dentinal subgroups showed that there was a significant difference just between the subgroups E3 and D3 (p=0.01).
Elective etching of enamel did not lead to significant increase in the shear bond strength of RelyX Unicem in comparison to RelyX ARC. On the other hand, elective etching of dentin reduces the bond strength of RelyX Unicem with the dentin.
本研究旨在测定有无表面处理时自粘结树脂水门汀与釉质和牙本质之间的剪切粘结强度，并将其与作为对照组的传统树脂水门汀进行比较。
在本实验研究中，对30颗健康人前磨牙的颊面和舌面进行抛光，以在颊面获得平整的釉质表面（E），在舌面获得牙本质表面（D）。制备60个长石质陶瓷块（2×3×3毫米），并随机分为六组（n = 10）。根据不同方案将每个陶瓷块粘结到制备好的表面（30个釉质表面和30个牙本质表面）：E1和D1；RelyX ARC作为对照组，E2、D2；RelyX Unicem，E3、D3；酸蚀+RelyX Unicem。对标本进行热循环处理，然后通过万能试验机以0.5毫米/分钟的十字头速度施加剪切力。通过体视显微镜评估断裂模式。使用SPSS 15版的描述性统计方法对数据进行分析。采用单因素方差分析和事后Tukey检验，以α = 0.05比较不同粘结剂组之间的粘结强度。
统计分析显示釉质亚组内无显著差异，但牙本质亚组内存在显著差异，且D1组和D3组之间存在统计学显著差异（p = 0.02）。相似的釉质和牙本质亚组之间的比较表明，仅E3亚组和D3亚组之间存在显著差异（p = 0.01）。
与RelyX ARC相比，选择性酸蚀釉质并未导致RelyX Unicem的剪切粘结强度显著增加。另一方面，选择性酸蚀牙本质会降低RelyX Unicem与牙本质的粘结强度。
