Department of Prosthodontics, Post Graduation Student, Maharishi Markandeshwar University, Mullana, Ambala, India.
J Adv Prosthodont. 2013 Aug;5(3):270-7. doi: 10.4047/jap.2013.5.3.270. Epub 2013 Aug 31.
This study was aimed to determine the effect of two chemically distinct denture cleansers and water on the surface hardness of acrylic and silicone based soft denture liners at various time intervals.
Two commonly used commercial resilient liner material were selected based on their chemical composition (silicone- and acrylic-based soft liners) for this investigation. 120 cylindrical specimens were made of 15 mm × 10 mm dimensions (according to ASTM: D-2240-64T) in a custom made metal mold. All specimens were stored in artificial saliva throughout the study. Forty specimens were cleansed daily in 0.5% sodium hypochlorite solution; forty were cleansed in sodium perborate and remaining forty specimens were daily rinsed in water. Testing was done at 1 week, 1 month, 3 months and 6 months for surface hardness using a Shore A Durometer. A mean of 3 reading for each sample was subjected to one-way ANOVA, Post Hoc test and pair-t test for statistical analysis. P values of less than 0.05 were taken as statistically significant.
Surface hardness of all the samples was significantly higher after a period of 6 months irrespective of the cleansing treatment. Minor changes were observed between control, sodium hypochlorite and sodium perborate groups with time. Greater change was observed in surface hardness of acrylic-based soft denture liners as compared to silicone-based soft liners for all groups, as time progressed.
Silicone-based soft denture liners performed significantly better in all cleansing treatments than acrylic-based soft denture liners.
本研究旨在确定两种化学性质不同的义齿清洁剂和水对不同时间间隔下丙烯酸酯和硅橡胶基软义齿衬里表面硬度的影响。
根据化学成分（硅橡胶基和丙烯酸酯基软衬垫）选择了两种常用的商业弹性衬垫材料进行本研究。使用定制的金属模具制作了 15mm×10mm 尺寸的 120 个圆柱形试件（根据 ASTM：D-2240-64T）。所有标本在整个研究过程中均保存在人工唾液中。40 个标本每天用 0.5%次氯酸钠溶液清洗；40 个标本用过硼酸钠清洗；其余 40 个标本每天在水中冲洗。使用 Shore A 硬度计在 1 周、1 个月、3 个月和 6 个月时测试表面硬度。对每个样本的 3 个读数进行单向方差分析、事后检验和配对 t 检验进行统计分析。P 值小于 0.05 被认为具有统计学意义。
无论清洁处理方式如何，所有样本的表面硬度在 6 个月后均显著升高。随着时间的推移，在对照组、次氯酸钠组和过硼酸钠组之间观察到微小变化。随着时间的推移，与硅橡胶基软衬垫相比，所有组的丙烯酸酯基软义齿衬里的表面硬度变化更大。
在所有清洁处理中，硅橡胶基软义齿衬里的性能明显优于丙烯酸酯基软义齿衬里。
