Effect of Aging on Bond Strength of Two Soft Lining Materials to a Denture Base Polymer
Effect of Aging on Bond Strength of Two Soft Lining Materials to a Denture Base Polymer
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老化对两种软衬里材料与义齿基托聚合物粘合强度的影响
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Alaa'a Salloum
中科院分区：
文献类型：
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作者：
Alaa'a Salloum
本研究的目的是评估蒸馏水和无机人工唾液浸泡对热聚合和自聚合硅基义齿衬里材料剪切结合强度的影响。所研究的义齿衬垫有Molloplast-B（热聚合）和Mollosil plus（自动聚合）。软衬试样尺寸为10 × 10 × 2.5 mm，在两块聚甲基丙烯酸甲酯板之间加工。为每种衬砌材料制备了30个抗剪试件。每种衬里材料将试样平均分为三组：第一组，试样制备48h后不浸泡进行试验；第二组，37℃蒸馏水浸泡12个月；第三组标本在37℃的无机人工唾液中浸泡12个月。采用万能试验机，以40 mm/min的十字速度测量剪切粘接强度，评估脱粘后的破坏模式（粘结、内聚和混合）。资料采用单因素方差分析（ANOVA）进行统计学分析（α = 0.05）。方差分析后采用Bonferroni事后检验进行两两比较。Molloplast-B和Mollosil plus在蒸馏水和人工唾液中浸泡后，剪切强度有显著差异。浸泡后，Molloplast-B的抗剪强度明显高于Mollosil plus。衬里材料的抗剪强度在两种溶液中浸泡后显著降低。分离后的目视检查显示，测试的软材料主要表现为粘结破坏。蒸馏水和无机人工唾液浸泡对试验衬里材料粘结强度的影响明显；然而，两者都有可接受的结合强度，可能适合长期使用。
The purpose of this study was evaluation the effect of immersion in distilled water and inorganic artificial saliva on the shear bond strength of a heat-polymerized and an auto-polymerized silicone-based denture lining materials. The denture liners investigated were Molloplast-B (heat-polymerized), and Mollosil plus (auto-polymerized). The soft liner specimens were 10 × 10 × 2.5 mm and were processed between two poly(methylmethacrylate) plates. Thirty shear specimens for each type of test lining material were prepared. Specimens were divided equally into three groups for each test lining material: first group, specimens were tested after 48 h of preparation without immersion; second group, specimens were tested following immersion in distilled water at 37 °C for 12 months; and third group, specimens were tested following immersion in inorganic artificial saliva at 37 °C for 12 months. Shear bond strength was measured using an universal testing machine at a crosshead speed of 40 mm/min and failure mode (adhesive, cohesive and mixed) after debonding was assessed. Data were statistically analyzed with one-way analysis of variance (ANOVA) (α = 0.05). ANOVA was followed by Bonferroni post hoc tests for pairwise comparisons. A significant difference in shear bond strength was detected between Molloplast-B and Mollosil plus following immersion in distilled water and artificial saliva. Molloplast-B demonstrated considerably higher shear strength than Mollosil plus after immersion. Shear strengths of the lining materials investigated reduced significantly after immersion in both solutions. Visual examination after separation revealed that the soft materials tested exhibited mostly adhesive failure. The effect of immersion in distilled water and inorganic artificial saliva on bond strength of test lining materials was perceivable; however, both of them had acceptable bond strength and might be proper for long-term use.