Pisani Marina Xavier, Silva-Lovato Cláudia Helena, Malheiros-Segundo Antônio de Luna, Macedo Ana Paula, Paranhos Helena Freitas Oliveira
Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, Sao Paulo, Brazil.
J Prosthodont. 2009 Feb;18(2):123-9. doi: 10.1111/j.1532-849X.2008.00380.x. Epub 2008 Oct 20.
The purpose of this study was to investigate the effect of sodium perborate on the bond strength and degree of infiltration between acrylic resin/resilient denture liners.
Three denture liners (Elite Soft, Mucopren Soft, Kooliner) were investigated. Twenty specimens (83 x 10 x 10 mm(3)) of each material were made by processing the denture liners against two polymerized PMMA blocks. Ten specimens for each material were stored in artificial saliva at 37 degrees C (control group: TBS1), and the other ten specimens were stored in artificial saliva at 37 degrees C combined with sodium perborate (experimental group: TBS2). All specimens were placed under tension until failure in a Universal Testing Machine at a crosshead speed of 5 mm/min after 7 (T7) and 60 (T60) days (n = 5). Failure strength (MPa) was recorded, and mode of failure was characterized as cohesive, adhesive, or cohesive/adhesive. For the infiltration tests, ten circular specimens (14-mm diameter x 2-mm thick) of each material were stored in artificial saliva and 0.5% methylene blue at 37 degrees C (control group: I1), and ten specimens were stored in artificial saliva and 0.5% methylene blue at 37 degrees C combined with daily immersions for 5 minutes in an effervescent solution of sodium perborate (experimental group: I2). The degree of infiltration was obtained through photographs and using Software Image Tool after 120 days.
For Kooliner, the statistical test did not show a significant difference in the bond strength due to the influence of the immersion period or to the use of sodium perborate. Elite Soft presented a significant increase in the average tension in T7 and in T60 in both TBS1 and TBS2. Inversely, the Mucopren suffered a significant decrease in the tension value in the same period as the TBS1 group as well as in the TBS2. The infiltration percentage was analyzed with the Kruskal-Wallis test (26.18; p < 0.05), which indicated significant differences between the compared averages for the groups. Comparing the averages of materials, the statistical test did not show significant differences between the control (I1) and experimental (I2) groups after 120 days.
The use of sodium perborate did not promote significant alterations in the evaluated properties. Kooliner presented the best results.
本研究旨在探讨过硼酸钠对丙烯酸树脂/弹性义齿衬垫之间粘结强度和渗透程度的影响。
研究了三种义齿衬垫（Elite Soft、Mucopren Soft、Kooliner）。通过将义齿衬垫与两个聚合的聚甲基丙烯酸甲酯（PMMA）块进行加工，制备每种材料的20个样本（83×10×10mm³）。每种材料的10个样本储存在37℃的人工唾液中（对照组：TBS1），另外10个样本储存在37℃的人工唾液中并加入过硼酸钠（实验组：TBS2）。7天（T7）和60天（T60）后（n = 5），所有样本在万能试验机中以5mm/min的十字头速度承受拉力直至破坏。记录破坏强度（MPa），并将破坏模式表征为内聚破坏、粘结破坏或内聚/粘结破坏。对于渗透试验，每种材料的10个圆形样本（直径14mm×厚2mm）储存在37℃的人工唾液和0.5%亚甲蓝中（对照组：I1），另外10个样本储存在37℃的人工唾液和0.5%亚甲蓝中，并每天在过硼酸钠泡腾溶液中浸泡5分钟（实验组：I2）。120天后通过照片并使用Image Tool软件获得渗透程度。
对于Kooliner，由于浸泡时间的影响或过硼酸钠的使用，统计检验未显示粘结强度有显著差异。Elite Soft在TBS1和TBS2组的T7和T60时平均拉力均显著增加。相反，Mucopren在与TBS1组相同的时期以及TBS2组中拉力值显著降低。用Kruskal-Wallis检验（26.18；p < 0.05）分析渗透百分比，结果表明各比较组平均值之间存在显著差异。比较材料平均值，120天后统计检验未显示对照组（I1）和实验组（I2）之间有显著差异。
过硼酸钠的使用并未使所评估的性能产生显著变化。Kooliner表现出最佳结果。
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