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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of thermocycling on bond strength and elasticity of 4 long-term soft denture liners.
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Effect of thermocycling on bond strength and elasticity of 4 long-term soft denture liners.

机译：热循环对4种长期软义齿衬垫的粘结强度和弹性的影响。

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Statement of Problem. Two problems found in prostheses with soft liners are bond failure to the acrylic resin base and loss of elasticity due to material aging. Purpose. This in vitro study evaluated the effect of thermocycling on the bond strength and elasticity of 4 long-term soft denture liners to acrylic resin bases. Material and Methods. Four soft lining materials (Molloplast-B, Flexor, Permasoft, and Pro Tech) and 2 acrylic resins (Classico and Lucitone 199) were processed for testing according to manufacturers' instructions. Twenty rectangular specimens (10 x 10-mm(2) cross-sectional area) and twenty cylinder specimens (12.7-mm diameter x 19.0-mm height) for each liner/resin combination were used for the tensile and deformation tests, respectively. Specimen shape and liner thickness were standardized. Samples were divided into a test group that was thermocycled 3000 times and a control group that was stored for 24 hours in water at 37 degrees C. Mean bond strength, expressed in megapascals (MPa), was determined in the tensile test with the use of a universal testing machine at a crosshead speed of 5 mm/min. Elasticity, expressed as percent of permanent deformation, was calculated with an instrument for measuring permanent deformation described in ADA/ANSI specification 18. Data from both tests were examined with 1-way analysis of variance and a Tukey test, with calculation of a Scheffe interval at a 95% confidence level. Results. In the tensile test under control conditions, Molloplast-B (1.51 +/- 0.28 MPa [mean +/- SD]) and Pro Tech (1.44 +/- 0.27 MPa) liners had higher bond strength values than the others (P <.05). With regard to the permanent deformation test, the lowest values were observed for Molloplast-B (0.48% +/- 0.19%) and Flexor (0.44% +/- 0.14%) (P <.05). Under thermocycling conditions, the highest bond strength occurred with Molloplast-B (1.37 +/- 0.24 MPa) (P <.05). With regard to the deformation test, Flexor (0.46% +/- 0.13%) and Molloplast-B (0.44% +/- 0.17%) liners had lower deformation values than the others (P <.05). Conclusion. The results of this in vitro study indicated that bond strength and permanent deformity values of the 4 soft denture liners tested varied according to their chemical composition. These tests are not completely valid for application to dental restorations because the forces they encounter are more closely related to shear and tear. However, the above protocol serves as a good method of investigation to evaluate differences between thermocycled and control groups.
机译：问题陈述。在具有软衬里的假体中发现的两个问题是与丙烯酸树脂基料的粘合失败以及由于材料老化而导致的弹性损失。目的。这项体外研究评估了热循环对4种长期柔软义齿衬板与丙烯酸树脂基底的粘合强度和弹性的影响。材料与方法。根据制造商的说明，对四种软衬里材料（Molloplast-B，Flexor，Permasoft和Pro Tech）和2种丙烯酸树脂（Classico和Lucitone 199）进行了处理。对于每种衬里/树脂组合，分别使用二十个矩形样品（横截面面积为10 x 10mm（2））和二十个圆柱样品（直径为12.7mm x高度为19.0mm）进行拉伸和变形测试。标本形状和衬里厚度标准化。将样品分成热循环3000次的测试组和在37℃的水中储存24小时的对照组。在拉伸试验中，使用通用测试机，十字头速度为5 mm / min。弹性（表示为永久变形的百分比）是使用ADA / ANSI规范18中所述的用于测量永久变形的仪器计算的。两种测试的数据均通过方差单向分析和Tukey检验进行了检验，并计算了Scheffe间隔置信水平为95％。结果。在控制条件下的拉伸试验中，Molloplast-B（1.51 +/- 0.28 MPa [平均值+/- SD]）和Pro Tech（1.44 +/- 0.27 MPa）衬垫的粘合强度值高于其他衬垫（P <。 05）。关于永久变形测试，Molloplast-B（0.48％+/- 0.19％）和屈肌（0.44％+/- 0.14％）观察到最低值（P <.05）。在热循环条件下，Molloplast-B的粘结强度最高（1.37 +/- 0.24 MPa）（P <.05）。关于变形试验，屈肌衬套（0.46％+/- 0.13％）和Molloplast-B衬套（0.44％+/- 0.17％）的变形值比其他衬套低（P <.05）。结论。这项体外研究的结果表明，所测试的4种软义齿衬垫的结合强度和永久变形值根据其化学成分而有所不同。这些测试不能完全有效地应用于牙齿修复体，因为它们遇到的力与剪切和撕裂更紧密相关。但是，以上协议是评估热循环和对照组之间差异的一种很好的研究方法。

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