Ellakwa Ayman E, El-Sheikh Ali M
Department of Restorative Dentistry, Biomaterials Unit, College of Dentistry, King Faisal University, Dammam, Saudi Arabia.
J Prosthodont. 2006 Sep-Oct;15(5):300-5. doi: 10.1111/j.1532-849X.2006.00131.x.
The purpose of this study was to evaluate both the effects of immersion in different chemical disinfectant solutions and the type of repair material on the transverse strength of repaired heat-polymerized acrylic resin.
A total of 110 rectangular specimens (65 x 10 x 3 mm) of heat-polymerized acrylic resin (Triplex) were fabricated. After polymerization, the specimens were polished, then stored in distilled water at 37 degrees C for 1 week. The specimens were divided into 11 groups (n = 10) coded A to K. Specimens of Group A remained intact (control). The specimens of Groups C to F and Groups H to K were immersed in the following chemical disinfectant solutions (1%, 2.5%, and 5.25% sodium hypochlorite and 2% glutaraldehyde, respectively) for 10 minutes. The specimens of all groups except those of Group A were sectioned in the middle to create 10 mm gaps and repaired with the same resin (Groups B to F) and autopolymerizing acrylic resin (Groups G to K). The specimens of Groups C to F and Groups H to K were again immersed in the disinfectant solutions in the same sequence. The transverse strength (N/mm(2)) was tested for failure in a universal testing machine, at a crosshead speed of 5 mm/min. Two-way analysis of variance (ANOVA) was performed to evaluate the effects of both the disinfectant solutions and repair materials on the transverse strength of repaired specimens. All data were statistically analyzed using one-way analysis of variance followed by Tukey's test at 95% confidence level.
The repaired specimens treated with/without disinfectant solutions showed similar (p > 0.05) transverse strength values. No differences (p > 0.05) were detected among the repaired specimens either with heat-polymerized or autopolymerizing acrylic resins. The intact specimens showed transverse strength values (86.9 +/- 11.8) significantly higher (p < 0.05) than the values of the repaired specimens.
Among the repaired specimens, transverse strength was not affected after immersion in the disinfectants for the immersion period tested (10 min). The repair material, either heat-polymerized or autopolymerizing acrylic resin, had no effect on the transverse strength of the repaired acrylic resin specimens.
本研究旨在评估浸泡于不同化学消毒剂溶液以及修复材料类型对热聚合丙烯酸树脂修复体横向强度的影响。
制作了总共110个热聚合丙烯酸树脂（Triplex）的矩形试件（65×10×3mm）。聚合后，将试件打磨，然后在37℃的蒸馏水中储存1周。试件分为11组（n = 10），编号为A至K。A组试件保持完整（对照组）。C至F组以及H至K组的试件分别浸泡在以下化学消毒剂溶液中（分别为1%、2.5%和5.25%的次氯酸钠以及2%的戊二醛）10分钟。除A组外，所有组的试件均在中间切开形成10mm的间隙，并用相同的树脂（B至F组）和自凝丙烯酸树脂（G至K组）进行修复。C至F组以及H至K组的试件再次按相同顺序浸泡在消毒剂溶液中。在万能试验机上以5mm/min的十字头速度测试横向强度（N/mm²）直至试件破坏。进行双向方差分析（ANOVA）以评估消毒剂溶液和修复材料对修复试件横向强度的影响。所有数据均采用单因素方差分析，随后在95%置信水平下进行Tukey检验进行统计分析。
经/未经消毒剂溶液处理的修复试件显示出相似的（p > 0.05）横向强度值。热聚合或自凝丙烯酸树脂修复的试件之间未检测到差异（p > 0.05）。完整试件的横向强度值（86.9±11.8）显著高于（p < 0.05）修复试件的值。
在修复试件中，在所测试的浸泡时间（10分钟）内浸泡于消毒剂后横向强度未受影响。热聚合或自凝丙烯酸树脂修复材料对丙烯酸树脂修复试件的横向强度没有影响。
