Effect of Er,Cr:YSGG laser, air abrasion, and silane application on repaired shear bond strength of composites

Aged resin composites have a limited number of carbon-carbon double bonds to adhere to a new layer of resin. Study objectives were to 1) evaluate various surface treatments on repaired shear bond strength between aged and new resin composites and 2) to assess the influence of a silane coupling agent...

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Bibliographic Details
Published in:	Operative dentistry Vol. 38; no. 3; pp. E1 - E66
Main Authors:	Cho, S D, Rajitrangson, P, Matis, B A, Platt, J A
Format:	Journal Article
Language:	English
Published:	United States 01-05-2013
Subjects:	Acid Etching, Dental - methods Acrylic Resins - chemistry Aluminum Oxide - chemistry Composite Resins - chemistry Dental Bonding Dental Etching - methods Dental Restoration Repair Dental Stress Analysis - instrumentation Dentistry Humans Lasers, Solid-State Materials Testing Phosphoric Acids - chemistry Resin Cements - chemistry Shear Strength Silanes - chemistry Stress, Mechanical Surface Properties Temperature Time Factors
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Summary:	Aged resin composites have a limited number of carbon-carbon double bonds to adhere to a new layer of resin. Study objectives were to 1) evaluate various surface treatments on repaired shear bond strength between aged and new resin composites and 2) to assess the influence of a silane coupling agent after surface treatments. Eighty disk-shape resin composite specimens were fabricated and thermocycled 5000 times prior to surface treatment. Specimens were randomly assigned to one of the three surface treatment groups (n=20): 1) air abrasion with 50-μm aluminum oxide, 2) tribochemical silica coating (CoJet), or 3) Er,Cr:YSGG (erbium, chromium: yttrium-scandium-gallium-garnet) laser or to a no-treatment control group (n=20). Specimens were etched with 35% phosphoric acid, rinsed, and dried. Each group was divided into two subgroups (n=10): A) no silanization and B) with silanization. The adhesive agent was applied and new resin composite was bonded to each conditioned surface. Shear bond strength was evaluated and data analyzed using two-way analysis of variance (ANOVA). Air abrasion with 50-μm aluminum oxide showed significantly higher repair bond strength than the Er,Cr:YSGG laser and control groups. Air abrasion with 50-μm aluminum oxide was not significantly different from tribochemical silica coating. Tribochemical silica coating had significantly higher repair bond strength than Er,Cr:YSGG laser and the control. Er,Cr:YSGG laser and the control did not have significantly different repair bond strengths. Silanization had no influence on repair bond strength for any of the surface treatment methods. Air abrasion with 50-μm aluminum oxide and tribochemical silica followed by the application of bonding agent provided the highest repair shear bond strength values, suggesting that they might be adequate methods to improve the quality of repairs of resin composites.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-News-1 ObjectType-Feature-3 content type line 23
ISSN:	0361-7734 1559-2863
DOI:	10.2341/11-054-l