Bond strength and marginal microleakage in restorations photopolymerized with LED and halogen light associated with three application modes of a universal adhesive system: in vitro study

RGO: Revista Gaúcha de Odontologia

Paulo Guilherme Bittencourt MARCHI¹  Felipe de Brum RICARDI²  Márcio José MENDONÇA²  Saulo Vinicius da ROSA²  Mauro Carlos Agner BUSATO²  Priscilla do Monte Ribeiro BUSATO² 

[1] Universidade Estadual Paulista, Campus Araraquara;Universidade Estadual do Oeste do Paraná, Pós-Graduação em Odontologia;

关键词: dentin-bonding agentes;    dentistry;    light-curing of dental adhesives;   

DOI  :  http://dx.doi.org/10.1590/1981-86372019000313586

来源: DOAJ

【 摘 要 】

Objective: This study aimed to assess the bond strength and marginal microleakage in composite resin restorations, using the Single Bond Universal adhesive system associated with Ultralux (halogen) and Bluephase (LED) light curing units. Methods: For bond strength, 80 healthy human third molars were divided into halogen light (n=40) and LED (n=40), and subdivided according to the following application techniques for the adhesive system: etch-and-rinse (enamel), self-etching (enamel), etch-and-rinse (dentin), and self-etching (dentin). The teeth were subjected to the microtensile test and the fracture pattern was observed under an optical microscope at 40X magnification; they were analyzed by ANOVA, and Fisher and Tukey’s tests (5%). For the marginal microleakage test, 120 class II cavities were prepared in 60 healthy human third molars that were randomly divided into halogen light (n=30) and LED (n=30), and subdivided according to the following application techniques for the adhesive system: etch-and-rinse, selective etching, and self-etching. The teeth were thermocycled 2000 times (±5/55°C), stained in 5% basic fuchsin and sectioned for qualitative and quantitative assessments; they were analyzed by Kruskall-Wallis and Dunn tests (5%). Results: For the bond strength of enamel and dentin, the adhesive application with prior acid etching was better than self-etching (p<0.0001), regardless of the type of light curing unit (p<0.05). Etch-and-rinse showed the lowest microleakage values (p<0.0001). Conclusion: Etch-and-rinse obtained the best results relative to the other application techniques for the adhesive system in both tests, regardless of the type of light curing unit.

【 授权许可】

Unknown