Magni Elisa, Ferrari Marco, Papacchini Federica, Hickel Reinhard, Ilie Nicoleta
University of Siena, School of Dental Medicine, Department of Fixed Prosthodontics and Dental Materials, Policlinico "Le Scotte", Viale Bracci, Siena, 53100, Italy.
Am J Dent. 2010 Oct;23(5):260-4.
To evaluate the effect of gasiform ozone on the repair strength of ormocer-based and silorane-based composites.
160 cavities were created in methacrylate cylinders. Half of the cavities were filled with a silorane-based composite, whereas the other half was filled with an ormocer-based composite. After storage (1 week, deionized water, 37 degrees C) the specimens of each restorative material were divided into two main experimental groups: in Group 1 the specimens were subjected to a 60-second ozone gas application; in Group 2 no pretreatment was performed (control). The corresponding adhesive of each restorative material was applied as the intermediate repair agent in both groups. Repair cylinders were then built up with the homologous material. Half of the specimens in each group were subjected to thermocycling (5,000 cycles, 5 degrees C-55 degrees C, dwell time 30 seconds, transfer time 5 seconds) prior to testing, whereas the other specimens were immediately tested. The repair strength was assessed with a shear test. The two-way ANOVA with pretreatment and thermocycling as the main factors was used to analyze the shear bond strength data within each restorative material.
The pretreatment, the thermocycling and their interaction did not significantly affect the repair strength of either tested materials (P > 0.05). The ozone treatment did not significantly affect the repair strength. The silorane-based composite showed lower repair strengths compared to those of the ormocer-based composite. The immediate repair strengths in the ozone-treated and control groups were respectively, 28.1 (13.8) MPa and 28.8 (8.8) MPa for the silorane-based composite and 31.5 (9.3) MPa and 35.6 (10.6) MPa for the ormocer-based composite. After thermocycling, the repair strengths in the ozone-treated and control groups were 27.7 (9.7) MPa and 29.5 (11.1 ) MPa for the silorane-based composite and 31.4 (6.0) MPa and 34.2 (4.5) MPa for the ormocer-based composite. Mixed failures occurred most frequently in all experimental groups. In conclusion, ozone did not affect the repair strength of the tested silorane-based and ormocer-based composites.
评估气态臭氧对基于有机硅氧烷和基于有机杂化陶瓷的复合材料修复强度的影响。
在甲基丙烯酸酯圆柱体中制备160个洞形。一半的洞形用基于硅氧烷的复合材料填充，另一半用基于有机杂化陶瓷的复合材料填充。储存（1周，去离子水，37摄氏度）后，将每种修复材料的样本分为两个主要实验组：第1组样本接受60秒的臭氧气体处理；第2组不进行预处理（对照）。两组均使用每种修复材料相应的粘结剂作为中间修复剂。然后用同源材料构建修复圆柱体。每组中一半的样本在测试前进行热循环（5000次循环，5摄氏度至55摄氏度，停留时间30秒，转移时间5秒），而其他样本立即进行测试。用剪切试验评估修复强度。以预处理和热循环为主要因素的双向方差分析用于分析每种修复材料内的剪切粘结强度数据。
预处理、热循环及其相互作用对两种测试材料的修复强度均无显著影响（P>0.05）。臭氧处理对修复强度无显著影响。与基于有机杂化陶瓷的复合材料相比，基于硅氧烷的复合材料显示出较低的修复强度。对于基于硅氧烷的复合材料，臭氧处理组和对照组的即时修复强度分别为28.1（13.8）MPa和28.8（8.8）MPa；对于基于有机杂化陶瓷的复合材料，分别为31.5（9.3）MPa和35.6（10.6）MPa。热循环后，基于硅氧烷的复合材料在臭氧处理组和对照组的修复强度分别为27.7（9.7）MPa和29.5（11.1）MPa；对于基于有机杂化陶瓷的复合材料，分别为31.4（6.0）MPa和34.2（4.5）MPa。所有实验组中混合破坏最为常见。总之，臭氧不影响测试的基于硅氧烷和基于有机杂化陶瓷的复合材料的修复强度。
