Meşe Ayşe, Güzel Kahraman G, Uysal Ersin
Dicle University, Dental Faculty, Department of Prosthodontics, Diyarbakzr, Turkey.
Acta Odontol Scand. 2005 Feb;63(1):31-5. doi: 10.1080/00016350510019667.
To investigate the effect of storage duration on the tensile bond strength of acrylic and silicone-based denture base materials with liners either heat-cured or auto-cured.
The denture liners investigated were Vertex soft (acrylic-based, heat-cured), Coe soft (acrylic-based, auto-cured), Molloplast-B (silicone-based, heat-cured), and Mollosil plus (silicone-based, auto-cured). The soft liner specimens were 10 x 10 x 3 mm and were processed between two PMMA blocks. They were tested following immersion in water at 37 degrees C for 1 day, 1 week, and 1, 3, and 6 months. Tensile bond strength was measured using a universal testing machine (Testometric Micro 500) at a crosshead speed of 20 mm/min (n = 10 specimens per experimental group). Multiple ANOVA and Tukey HSD were used to analyse the data at a pre-set alpha of 0.05.
The results indicate that the tensile bond strength of acrylic-based soft liners is greater than that of silicone-based materials. The bond strength of all lining materials decreases with storage duration; the decrease being greatest for the acrylic-based soft liners. The decrease in bond strength of the auto-cured materials is greater than that of the heat-cured products.
Comparison of the materials in this study indicates that the silicone-based, heat-cured soft liner is superior, based on the tensile bond strength property. Use of silicone-based, heat-cured soft liners may provide better clinical success over a long period. These laboratory results need to be verified by clinical testing.
研究储存时间对热固化或自固化衬垫的丙烯酸类和硅酮类义齿基托材料拉伸粘结强度的影响。
所研究的义齿衬垫材料有Vertex soft（丙烯酸类，热固化）、Coe soft（丙烯酸类，自固化）、Molloplast-B（硅酮类，热固化）和Mollosil plus（硅酮类，自固化）。软衬垫标本尺寸为10×10×3毫米，在两块聚甲基丙烯酸甲酯块之间进行加工处理。将其浸泡在37摄氏度的水中1天、1周、1个月、3个月和6个月后进行测试。使用万能试验机（Testometric Micro 500）以20毫米/分钟的十字头速度测量拉伸粘结强度（每个实验组n = 10个标本）。采用多因素方差分析和Tukey HSD检验，以预先设定的α = 0.05分析数据。
结果表明，丙烯酸类软衬垫的拉伸粘结强度大于硅酮类材料。所有衬垫材料的粘结强度均随储存时间下降；丙烯酸类软衬垫下降幅度最大。自固化材料粘结强度的下降幅度大于热固化产品。
本研究中材料的比较表明，基于拉伸粘结强度特性，硅酮类热固化软衬垫更具优势。使用硅酮类热固化软衬垫可能在长期内提供更好的临床效果。这些实验室结果需要通过临床测试进行验证。
