In vitro evaluation of repair bond strength of composite: Effect of surface treatments with bur and laser and application of universal adhesive

Abstract

Surface preparation of aged composite by bur and application of universal adhesive can improve the repair bond strength of composite. Application of silane (without adhesive) in the process of repair cannot provide adequately high repair bond strength.

Universal dental adhesives: Current status, laboratory testing, and clinical performance

“…Studies evaluating use of UAs for repairing aged pre‐polymerized resin composites for indirect restorations recommend prior air‐abrasion for effective bonding . For aged direct composites, either airborne‐particle abrasion or grinding with a diamond bur were recommended for improving the repair bond strengths . For bonding composite resins to stainless steel crowns, Hattan et al reported superior shear bond strengths and lesser adhesive failures with a UA versus traditional one‐bottle ER adhesive.…”

The influence of different surface treatment protocols and bonding agents on the repair microtensile bond strength of six-month’ aged composite: An in vitro study

“…After surface treatment, the next step is the application of bonding gents in order to enhance chemical bond as experimentally proved in many literatures. [1,2,8,10,18,19] In earlier studies, promising results of composite repair were obtained using different protocols; however these results were questionable as most tests were performed on non-aged substrates which didn't represent the real clinical situation. In addition, they often depend on using the same type of composite for the substrate and the repair material [5,6,11].…”

“…The parameters used were: 2 W output power with 200 MJ energy and 10 Hz frequency in a super short pulsed mode (SSP); pulse duration 50 micro seconds. Laser was used with gentle sweeping motion at a working distance of 1 mm using HO2 Tipless hand piece and the surfaces were treated at irradiation condition of 50% water and 60% air with air/water spray [15,16,19]. A forth group had no surface treatment (control).…”

“…Beams were randomly divided into another two groups according to the time of microtensile bond strength testing; either IM or after TC for 5000 cycles between 5-55°C with a dwell time of 20 seconds. [2,19,20,25,26] random allocation was done in order to decrease bias between groups.…”

Controle do desgaste com inibidores de proteases e agente de estabelecimento de ligações cruzadas entre fibrilas de colágeno na resistência de união do conjunto adesivo-resina composta à dentina erodida

“…Dentre elas, mostra-se a mais efetiva a asperização da superfície com ponta diamantada, que, por remover a camada desmineralizada mais externa, iguala os valores de RU à dentina erodida àqueles à normal (Zimmerli et al, 2012). Talvez seja essa a técnica mais empregada pelos cirurgiões-dentistas, por ser barata e de rápida execução (Hannig et al, 2006;Kiomarsi et al, 2017). Contudo, não permite controle da quantidade de estrutura dentária desgastada (Garone-Filho, , no geral superior à correspondente a camada desmineralizada, que parece ter em média apenas 3 a 7…”