热循环对两种软衬材料拉伸粘结强度的影响。
The effect of thermocycling on tensile bond strength of two soft liners.
作者信息
Geramipanah Farideh, Ghandari Masoumeh, Zeighami Somayeh
机构信息
Associate Professor, Dental Implant Research Center and Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Dentist, Private Practice, Tehran, Iran.
出版信息
J Dent (Tehran). 2013 Sep;10(5):405-10. Epub 2013 Sep 30.
OBJECTIVE
Failure of soft liners depends mostly on separation from the denture base resin; therefore measurement of the bond strength is very important. The purpose of this study was to compare the tensile bond strength of two soft liners (Acropars, Molloplast-B) to denture base resin before and after thermocycling.
MATERIALS AND METHODS
Twenty specimens fromeach of the two different soft liners were processed according to the manufacturer's instructions between two polymethyl methacrylate (PMMA) sheets. Ten specimens in each group were maintained in 37°C water for 24 hours and 10 were thermocycled (5000 cycles) among baths of 5° and 55°C. The tensile bond strength was measured using a universal testing machine at a crosshead speed of 5 mm/min. Mode of failure was determined with SEM (magnification ×30). Two-way ANOVA was used to analyze the data.
RESULTS
The mean and standard deviation of tensile bond strength of Acropars and Molloplast-B before thermocycling were 6.59±1.85 and1.51±0.22 MPa, respectively and 5.89±1.52 and1.37±0.18 MPa, respectively after thermocycling. There was no significant difference before and after thermocycling. Mode of failure in Acropars and Molloplast-B were adhesive and cohesive, respectivley.
CONCLUSION
The bond strength of Acropars was significantly higher than Molloplast-B (P<0.05).
目的
软衬材料的失败主要取决于与义齿基托树脂的分离；因此，粘结强度的测量非常重要。本研究的目的是比较两种软衬材料（Acropars、Molloplast-B）在热循环前后与义齿基托树脂的拉伸粘结强度。
材料与方法
按照制造商的说明，在两块聚甲基丙烯酸甲酯（PMMA）板之间加工来自两种不同软衬材料的20个标本。每组10个标本在37°C水中保持24小时，10个标本在5°和55°C的水浴中进行热循环（5000次循环）。使用万能试验机以5mm/min的十字头速度测量拉伸粘结强度。用扫描电子显微镜（放大倍数×30）确定失败模式。采用双向方差分析对数据进行分析。
结果
热循环前Acropars和Molloplast-B的拉伸粘结强度平均值和标准差分别为6.59±1.85和1.51±0.22MPa，热循环后分别为5.89±1.52和1.37±0.18MPa。热循环前后无显著差异。Acropars和Molloplast-B的失败模式分别为粘结性和内聚性。
结论
Acropars的粘结强度显著高于Molloplast-B（P<0.05）。
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