Immediate Adhesive Properties to Dentin and Enamel of a Universal Adhesive Associated With a Hydrophobic Resin Coat

Abstract

Multi-mode adhesives may be optimized when they are used as self-etch adhesives on dentin with a separate enamel etching step. SUMMARYObjectives: To evaluate the effect of acid etching and application of a hydrophobic resin coat on the enamel/dentin bond strengths and degree of conversion (DC) within the hybrid layer of a universal adhesive system (G-Bond Plus [GB]).Methods: A total of 60 extracted third molars were divided into four groups for bondstrength testing, according to the adhesive strategy: GB applied as a one-step self-etch adhesive (1-stepSE); GB applied as in 1-stepSE followed by one coat of the hydrophobic resin Heliobond (2-stepSE); GB applied as a two-step etch-and-rinse adhesive (2-stepER); GB applied as in 2-stepER followed by one coat of the hydrophobic resin Heliobond (3-stepER). There were 40 teeth used for enamel microshear bond strength (lSBS) and DC; and 20 teeth used for dentin microtensile bond strength (lTBS) and DC. After restorations were constructed, specimens were stored in water (378C/24 h) and then tested at 0.5 mm/min (lTBS) or 1.0 mm/min (lSBS). Enamel-resin

Effect of caries-affected dentin on one-step universal and multi-step etch-and-rinse adhesives’ bond strength

“…The findings reinforce the view that acidic conditioners may not be sufficiently strong to etch sclerotic dentin, so bonding to this type of dentin may require a different pre treatment 3,9,15 . For instance, use of hypochloric acid before mild self-etch adhesive application can significantly improve microtensile bond strength on caries-affected dentin and the increased bond strength is associated with more regular monomeric infiltration into caries-affected dentin 18 .…”

“…However, these results are not supported by findings obtained with two mild self-etch adhesives (Aqua Bond and Tyrian SPE), which showed higher results on caries-affected dentin 9 Although Single Bond Universal in the self-etch approach was not compared with another self-etch adhesive, the present results imply that bond strength depends on dentinal condition. Use of a hydrophobic resin coat before composite resin placement may increase bond strength of self-etch adhesives on normal dentin 3 . In this perspective hydrophobic resin coats might not be efficient on caries-affected dentin because of the fragility of the subsuperficial layer, which is poorly impregnated by adhesive monomers 1,15,18 .…”

“…The researchers and manufacturers have dedicated efforts to obtain adequate hybridization of enamel and dentin introducing modifications on the adhesive systems and protocols through the last years. Some of these alterations resulted in better bond performances concerning to hybrid layer formation and mechanical properties 2,3 .…”

Shear bond strength of universal adhesive systems to a bioactive dentin substitute (Biodentine®) at different time intervals

“…These adhesives are easier to use compared to multi-step etch-and-rinse (ER) adhesives. Also, they have a faster application procedure and require less technical sensitivity [12,13] . The SE technique enables ease of application and reduces contamination with saliva through reducing procedure steps, particularly in children who are difficult to cooperate [14,15] .…”

Aplicação dos sistemas adesivos nos últimos cinco anos

“…Perdigão et al 29 em 2014, verificaram as propriedades adesivas imediatas em dentina e em esmalte do adesivo universal associado a uma camada hidrofóbica de resina. Os autores observaram aumento da resistência adesiva dos adesivos, tanto do autocondicionante quanto do convencional.…”