European Journal of Prosthodontics and Restorative Dentistry

Immediate and Late Repair of Microhybrid Resin Composites: Effect of Silane Coupling Agent, Universal Adhesives and Photo Polymerization

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Cover Date

June 2023

Print ISSN

0965-7452

Electronic ISSN

2396-8893

Vol

31

Issue

2

Abstract

This study investigated the effect of silane coupling agent and universal adhesive
application on repair bond strength of resin-based composite after bur grinding.
Microhybrid resin composite (Charisma Smart) blocks (N=80; 8x8x4 mm3) were prepared,
aged (37°C; 1 month), roughened, etched and randomly divided into two groups. Silane
was applied to half of the groups (Porcelain Primer, Bisco), before one of the following
universal primers/adhesives was applied: a) Scotchbond Universal (3M), b) All-Bond
Universal (Bisco), c) G-Premio Bond (GC), and d) Clearfil SE Bond (Kuraray). In each
adhesive group half of the group was photo-polymerized. The blocks were repaired
with the same size resin composite and segmented into beams. Half of the beams
were subjected to micro-tensile bond test (1 mm/min), while the other half was aged
(37°C; 6 months) prior to testing. Failure modes were analyzed using Scanning Electron
Microscopy (SEM). Data were analyzed using repeated measures of ANOVA, Tukey’s
post-hoc, and paired t-tests (alpha=0.05). The silane application did not affect the repair
bond strength regardless of photo-polymerization of the adhesive resin. The repair bond
strength decreased significantly after 6 months when adhesive resin was not photopolymerized
(p<0.05). Photo-polymerizing universal adhesives might ensure higher
repair bond strength and its maintenance after aging.

Keywords
Adhesion
Photo-polymerization
Resin Composite
Repair
Silane Coupling Agents
Universal Adhesive