Ribeiro José Carlos Rabelo, Gomes Priscila Nogueira, Moysés Marcos Ribeiro, Dias Sérgio Candido, Pereira Luciano José, Ribeiro João Gustavo Rabelo
Department of Restorative Dentistry, Dental School of Três Corações, Vale do Rio Verde University, UNINCOR, Três Corações, MG, Brazil.
J Dent. 2008 May;36(5):326-30. doi: 10.1016/j.jdent.2008.01.015. Epub 2008 Mar 11.
The aim of this study was to investigate the shear strength between distinct associations of different commercial composite resins and their fracture modes.
Nine composite-composite associations (n=90) were prepared for shear strength evaluation and separated into the following groups: Z/Z (Filtek Z250 UD+Filtek Z250 A2); Z/D (Filtek Z250 UD+Durafill VS A2); Z/S (Filtek Z250 UD+Filtek Supreme YT); C/C (Charisma OA2+Charisma A2); C/D (Charisma OA2+Durafill VS A2); C/S (Charisma OA2+Filtek Supreme YT); H/H (Herculite XRV B2D+Herculite XRV B2E); H/D (Herculite XRV B2D+Durafill VS A2); H/S (Herculite XRV B2D+Filtek Supreme YT). Shear tests were carried out using universal mechanical test equipment with a load of 200kgf and speed of 0.5mm/min. Ultimate shear strength data (MPa) from all tested groups were submitted to analysis of variance (one-way ANOVA) and the Tukey test. The fractured surfaces of the test samples were visually evaluated by binocular stereomicroscope at 20 times magnification. Fractures were classified as either adhesive or cohesive or mixed.
The highest ultimate shear strength observed for composite-composite associations was found for the groups: Z/Z, C/S, H/H, H/S, Z/S and C/C. Those associations containing the Durafill resin were weaker than the others.
Microparticle RBC associations presented lower shear strength than hybrid and/or nanoparticle RBC associations, once the only significant difference was found when the Durafill resin was involved.
本研究旨在调查不同商用复合树脂的不同组合之间的剪切强度及其断裂模式。
制备了9组复合树脂组合（n = 90）用于剪切强度评估，并分为以下几组：Z/Z（Filtek Z250通用型+Filtek Z250 A2）；Z/D（Filtek Z250通用型+Durafill VS A2）；Z/S（Filtek Z250通用型+Filtek Supreme YT）；C/C（Charisma OA2+Charisma A2）；C/D（Charisma OA2+Durafill VS A2）；C/S（Charisma OA2+Filtek Supreme YT）；H/H（Herculite XRV B2D+Herculite XRV B2E）；H/D（Herculite XRV B2D+Durafill VS A2）；H/S（Herculite XRV B2D+Filtek Supreme YT）。使用通用机械测试设备进行剪切试验，载荷为200kgf，速度为0.5mm/min。将所有测试组的极限剪切强度数据（MPa）进行方差分析（单因素方差分析）和Tukey检验。通过双目立体显微镜在20倍放大倍数下对测试样品的断裂表面进行目视评估。断裂分为粘结性、内聚性或混合性。
在复合树脂组合中观察到的最高极限剪切强度出现在以下几组：Z/Z、C/S、H/H、H/S、Z/S和C/C。那些含有Durafill树脂的组合比其他组合弱。
一旦涉及Durafill树脂，发现唯一显著差异时，微颗粒树脂复合材料组合的剪切强度低于混合和/或纳米颗粒树脂复合材料组合。
