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Repairability of a packable resin-based composite using different adhesives
Walter R L Dias1, André V Ritter, Edward J Swift
1Department of Operative Dentistry, School of Dentistry-University of North Carolina at Chapel Hill, 302 Brauer Hall, CB#7450, Chapel Hill, NC 27599-7450, USA. diasw@dentistry.unc.edu
American Journal of Dentistry
|September 12, 2003
Summary
Dental composite repair strength varied significantly by adhesive. Packable composite (Filtek P60) and conventional hybrid composite (Pertac II) repairs showed lower bond strengths than controls, with Prompt L-Pop yielding the weakest repairs.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Dental composite restorations often require repair rather than replacement.
- Evaluating the bond strength of different adhesive systems to aged composite substrates is crucial for predicting repair longevity.
- Packable and conventional hybrid composites exhibit distinct material properties that may influence repair outcomes.
Purpose of the Study:
- To compare the repair bond strength of a packable composite (Filtek P60) versus a conventional hybrid composite (Pertac II).
- To evaluate the efficacy of three distinct adhesive systems—an unfilled resin (EBS-Multi), a one-bottle, acetone-based adhesive (One-Step), and a self-etching adhesive (Prompt L-Pop)—in composite repair.
- To establish baseline repair strengths using control groups without additional surface treatment.
Main Methods:
- Composite disks of Filtek P60 and Pertac II were fabricated, aged, and surface-treated (sandblasting, silanation).
- Adhesives (EBS-Multi, One-Step, Prompt L-Pop) were applied to aged composite surfaces, followed by light-curing.
- Shear bond strength (SBS) was measured using an Instron testing machine 24 hours after bonding.
Main Results:
- Significant differences in mean SBS were observed across all groups (P<0.001).
- All repair groups exhibited significantly lower SBS compared to their respective control groups.
- Repairs using the self-etching adhesive Prompt L-Pop demonstrated significantly lower mean SBS than those using EBS-Multi and One-Step (P<0.05).
Conclusions:
- The repair potential of both packable and conventional hybrid composites is significantly influenced by the adhesive system used.
- Self-etching adhesives, such as Prompt L-Pop, may provide inferior repair bond strengths compared to unfilled resins or one-bottle systems.
- Clinical protocols for composite repair should carefully consider adhesive selection to optimize bond durability.