Chittaranjan B, Taruna M, Sudheer N, Patil Nagesh S
Department of Prosthodontics, Kamineni Institute of Dental Sciences, Sreepuram, Narketpally, Nalgonda (Dt), Andhra Pradesh, India.
Indian J Dent Res. 2013 May-Jun;24(3):321-5. doi: 10.4103/0970-9290.117994.
Bonding of artificial teeth and denture base material remained a significant problem for successful prosthetic treatment.
The purpose of this in vitro study was to evaluate shear bond strength of three different artificial teeth with heat cure denture base material after various surface conditioning methods and thermocycling.
Ninety mandibular first molar denture teeth were selected. They were divided into three groups, Group I: Nanocomposite resin (Veracia), Group II: Composite teeth (Endura), and Group III: Cross-linked acrylic denture teeth (Acry rock). All groups were further subdivided into subgroups based on surface conditioning methods. Subgroup A: No surface conditioning (control group), Subgroup B: Surface conditioning with methyl methacrylate-based bonding agent (Vitacoll), and Subgroup C: Air abrasion with 50 μm aluminum oxide powder particles plus silane-coupling agent (Monobond-S) and Vitacoll bonding agent. Evaluation of shear bond strength of all the specimens was done using universal testing machine.
Mean shear bond strength of Group I, Subgroup B (6.87 ± 0.934) showed higher value when compared with Group II, Subgroup B (6.76 ± 1.84) and Group III, Subgroup B (5.66 ± 2.18). The control group (untreated surface) of all three types of artificial teeth used in this study showed significantly lower shear bond strength values than experimental groups (surface conditioning methods; P < 0.05).
The results of this study suggest that there were significant differences in shear bond strength among control group and surface treatment groups of denture teeth bonded to heat cure denture base resin.
人工牙与义齿基托材料的粘结仍然是成功进行修复治疗的一个重大问题。
本体外研究的目的是评估在各种表面处理方法和热循环后，三种不同人工牙与热凝义齿基托材料的剪切粘结强度。
选择90颗下颌第一磨牙义齿牙。将它们分为三组，第一组：纳米复合树脂（Veracia），第二组：复合牙（Endura），第三组：交联丙烯酸义齿牙（Acry rock）。所有组根据表面处理方法进一步细分为亚组。亚组A：不进行表面处理（对照组），亚组B：用甲基丙烯酸酯类粘结剂（Vitacoll）进行表面处理，亚组C：用50μm氧化铝粉末颗粒加硅烷偶联剂（Monobond - S）和Vitacoll粘结剂进行空气喷砂处理。使用万能试验机对所有标本的剪切粘结强度进行评估。
第一组亚组B的平均剪切粘结强度（6.87±0.934）与第二组亚组B（6.76±1.84）和第三组亚组B（5.66±2.18）相比显示出更高的值。本研究中使用的所有三种类型人工牙的对照组（未处理表面）的剪切粘结强度值明显低于实验组（表面处理方法；P<0.05）。
本研究结果表明，粘结到热凝义齿基托树脂上的义齿牙对照组和表面处理组之间的剪切粘结强度存在显著差异。
