Effect of delayed insertion of composite resin on the bond strength of etch-and-rinse adhesive systems
Journal Title: RSBO - Year 2009, Vol 6, Issue 4
Abstract
Introduction: Etch-and-rinse adhesive systems are characterized by the dental acid etching previously to the monomer application. These materials can be classified as 3-step (when primer and bond are applied separately) or 2-step (when the primer and bond functions are carried out by a single component). Objective: To determine the influence of immediate or delayed insertion of restorative material on the values of bond strength of 2-step and 3-step etch-and-rinse adhesive systems using the microtensile test. Material and methods: Bovine incisors were used, which had its vestibular surface abraded to obtain a flat dentin surface. 3-step (Scotchbond Multi-Purpose – SMP; Optibond FL – OFL; Bond-It – BIT) and 2-step (Single-Bond – SB; Optibond Solo Plus – OSP; Bond-1 – B1) etch-and-rinse adhesive systems were used, and composite resin (Z-350) was adhered to this substrate at two different times: immediately and later (after 24 hours). Procedures were performed with simulated physiological pulpal pressure. Results were submitted to statistical analysis through Anova and Tukey’s test (p < 0.05). Results:When the composite resin was immediately inserted all the adhesive systems showed similar results. 3-step adhesive systems did not show reduction in bond strength values related to delayed insertion of composite. On the other hand, 2-step adhesive systems showed significant reduction in the values of bond strength. Reduction was around 30.24% to SB, 27.19% to OSP and 28.21% to B1. Conclusion:2-step etch-and-rinse adhesive systems should be used very carefully. It is advisable to insert and polymerize the composite resin immediately after the conclusion of adhesive procedure.
Authors and Affiliations
Edson CAMPOS, José SAAD, Sizenando PORTO NETO, Lucas CAMPOS, Marcelo ANDRADE
Keywords
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