Alonso Roberta Caroline Bruschi, Cunha Leonardo Gonçalves, Correr Gisele Maria, De Goes Mario Fernando, Correr-Sobrinho Lourenço, Puppin-Rontani Regina Maria, Sinhoreti Mário Alexandre Coelho
Department of Restorative Dentistry, Dental Materials Area, Piracicaba Dental School - UNICAMP Piracicaba, São Paulo, Brazil.
Acta Odontol Scand. 2004 Dec;62(6):298-304. doi: 10.1080/00016350410001784.
The aim of this study was to evaluate the effect of photoactivation methods, resin liners, and the association of these techniques on the marginal adaptation of composite restorations. One-hundred-and-twenty bovine incisors were selected. A circular cavity was prepared in a flat dentin area on the buccal surface and the Scotchbond Multi Purpose system was applied. These teeth were assigned to four groups in accordance with lining technique: control (one adhesive layer), three adhesive layers individually photoactivated, Filtek Flow, and Protect Liner F. Each group was subdivided depending on the photoactivation method: continuous light, soft-start, or intermittent light. All cavities were restored with Filtek Z250 and then polished. Caries detector was applied on each specimen for 5 s in order to verify marginal adaptation through dye-staining of the gaps formed on the outer margins. Images of the stained gaps were observed under the stereomicroscope, and transferred to a computer measurement program in order to determine gap length. Data were submitted to ANOVA and Tukey's test (P < 0.05). Significant differences among the lining techniques were only observed using the photoactivation method with continuous light. In this case, the lining technique with Filtek Flow significantly increased marginal adaptation of the composite to the outer dentin margins compared with the results of the control group. The other lining techniques showed intermediate values and no statistical difference from the other groups. For the photoactivation methods, intermittent light showed the best marginal quality of all the methods. This was statistically significant only for the control lining technique.
本研究的目的是评估光活化方法、树脂衬层以及这些技术的联合应用对复合树脂修复体边缘适应性的影响。选取了120颗牛切牙。在颊面平坦的牙本质区域制备圆形洞形，并应用Scotchbond多功能系统。根据衬层技术将这些牙齿分为四组：对照组（一层粘结剂）、单独光活化的三层粘结剂、Filtek Flow和Protect Liner F。每组再根据光活化方法细分为：连续光、软启动或间歇光。所有洞形均用Filtek Z250修复，然后进行抛光。对每个标本应用龋病检测剂5秒，以便通过对外边缘形成的间隙进行染料染色来验证边缘适应性。在体视显微镜下观察染色间隙的图像，并将其传输到计算机测量程序以确定间隙长度。数据提交给方差分析和Tukey检验（P < 0.05）。仅在使用连续光的光活化方法时，观察到衬层技术之间存在显著差异。在这种情况下，与对照组结果相比，使用Filtek Flow的衬层技术显著提高了复合材料与外牙本质边缘的边缘适应性。其他衬层技术显示出中间值，与其他组无统计学差异。对于光活化方法，间歇光在所有方法中显示出最佳的边缘质量。这仅在对照衬层技术中具有统计学意义。
