Does Adhesive Thickness Affect Resin-dentin Bond Strength after Thermal/Load Cycling?

E. Lodovici, A. Reis, S. Geraldeli, J. L. Ferracane, R. Y. Ballester, L. E.R. Filho

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

This study evaluated the influence of adhesive layer thickness (ADL) on the resin-dentin bond strength of two adhesive systems (AS) after thermal and mechanical loading (TML). A flat superficial dentin surface was exposed with 600-grit SiC paper on 40 molars. After primer application, the adhesive layer of Scotchbond Multipurpose (SBMP) or Clearfil SE Bond (CSEB) was applied in one or two layers to a delimited area (52 mm2) and resin blocks (Filtek Z250) were built incrementally. Half of the sample was stored in distilled water (37°C, 24 hours) and submitted to thermal (1,000; 5°-55°C) and mechanical cycles (500,000; l0kgf) [TML]. The other half was stored in distilled water (72 hours). The teeth were then sectioned to obtain sticks (0.8 mm 2) to be tested under tensile mode (1.0 mm/minute). The fracture mode was analyzed at 400x. The BS from all sticks from the same tooth was averaged for statistical purposes. The data was analyzed by three-way ANOVA. The x 2 test was used (p<0.05) to compare the frequency of pre-testing failure specimens. Higher BS values were observed for SBMP regardless of the ADL. The TML reduced the BS values irrespective of the adhesive employed and the ADL. A higher frequency of pre-testing failure specimens was observed for the cycled groups. A thicker adhesive layer, acting as an intermediate flexible layer, did not minimize the damage caused by thermal/mechanical load cycling for a three-step etch-and-rinse and two-step self-etch system.

Original languageEnglish (US)
Pages (from-to)58-64
Number of pages7
JournalOperative dentistry
Volume34
Issue number1
DOIs
StatePublished - Jan 1 2009

ASJC Scopus subject areas

  • Dentistry(all)

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