Oliveira Pedro Henrique Cabral, Oliveira Luiz Henrique Cabral, Cabral Márcia Regina, De Vito Moraes André Guaraci, Sgura Ricardo, Cesar Paulo Francisco, Gonçalves Marcela Leticia Leal, Brugnera Junior Aldo, Bussadori Sandra Kalil
1 Program in Biophotonics Applied to Health Sciences, Universidade Nove de Julho, Liberdade, São Paulo, Brazil.
2 Dentistry College, Universidade Nove de Julho, Liberdade, São Paulo, Brazil.
Photobiomodul Photomed Laser Surg. 2019 Jul;37(7):428-433. doi: 10.1089/photob.2018.4534. Epub 2019 Feb 21.
Evaluate the bond strength of repairs made on composite resin following the treatment of the surface of the flaw with different bonding agents and/or CO laser. The influence of CO laser and its interaction with other bonding agents on the surface of the flaw is not yet known. In this study, CO laser was chosen to treat the surface of the flaw due to its capacity to promote irregularities on the surface that enhance mechanical micro-retention. A block was created with Vitra APS nanohybrid composite resin (color: A3; FGM, Joinville, Brazil) measuring 5 mm in width, length, and depth (volume: 125 mm). The surface of the flaw was treated before the repair with an adhesive, silane bonding agent, and/or CO laser. Six specimens were created in composite resin for each group (total: = 36): G1: resin+resin; G2: adhesive+resin; G3: laser+adhesive; G4: laser+silane+adhesive; G5: silane+adhesive; G6: laser+silane. After the repair, the surfaces of the fracture of all specimens, which were submitted to the microtraction test, were analyzed under an optical microscope. Bond strength values obtained according to the type of surface treatment were tabulated and submitted to the Kruskal-Wallis test. Dunn's test was used to compare means. G3 and G4 had significantly higher bond strength values compared to all other groups tested. Adhesive fractures predominated in all groups. However, G3 and G4 had a higher percentage of cohesive fractures compared to the other groups. The application of CO laser as a surface treatment led to greater bond strength of composite resin repairs in comparison with the groups that only received treatment with a burr and silanization. The groups submitted to CO laser also had a significantly lower number of adhesive failures when submitted to the microtraction test.
评估在使用不同粘结剂和/或CO激光处理缺陷表面后，复合树脂修复体的粘结强度。CO激光及其与缺陷表面其他粘结剂的相互作用的影响尚不清楚。在本研究中，选择CO激光处理缺陷表面是因为其能够促进表面不规则性，从而增强机械微固位力。用Vitra APS纳米混合复合树脂（颜色：A3；FGM，约维莱，巴西）制作一个尺寸为宽、长、深均为5毫米（体积：125立方毫米）的块体。在修复前，用粘结剂、硅烷粘结剂和/或CO激光处理缺陷表面。每组在复合树脂中制作6个标本（共36个）：G1：树脂+树脂；G2：粘结剂+树脂；G3：激光+粘结剂；G4：激光+硅烷+粘结剂；G5：硅烷+粘结剂；G6：激光+硅烷。修复后，对所有进行微拉伸试验的标本断裂表面在光学显微镜下进行分析。根据表面处理类型获得的粘结强度值制成表格，并进行Kruskal-Wallis检验。使用Dunn检验比较均值。与所有其他测试组相比，G3和G4的粘结强度值显著更高。所有组中粘结剂断裂占主导。然而，与其他组相比，G3和G4的内聚性断裂百分比更高。与仅接受磨头处理和硅烷化处理的组相比，应用CO激光作为表面处理可使复合树脂修复体具有更高的粘结强度。接受CO激光处理的组在进行微拉伸试验时，粘结失败的数量也显著更低。
