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Self-etching primer vs phosphoric acid: an alternative concept for composite-to-enamel bonding
M Hannig1, K J Reinhardt, B Bott
1University of Kiel, Clinic of Operative Dentistry and Periodontology, Germany.
Operative Dentistry
|October 26, 1999
Summary
This in vitro study found that self-etching primers offer comparable composite-to-enamel bond strength and marginal adaptation in Class 2 restorations to traditional phosphoric acid etching. These findings suggest self-etching primers are a viable alternative for dental restorative techniques.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials Engineering
Background:
- Conventional dental restorations often rely on phosphoric acid etching for optimal composite-to-enamel adhesion.
- Self-etching priming agents offer a simplified, potentially less technique-sensitive alternative for bonding procedures.
- Evaluating the clinical efficacy of novel bonding agents is crucial for advancing restorative dentistry.
Purpose of the Study:
- To compare the composite-to-enamel bond strength of three self-etching priming agents against conventional phosphoric acid etching.
- To assess the marginal adaptation of resin composite restorations in Class 2 cavities using these bonding agents.
- To determine the viability of self-etching primers as an alternative to traditional etching methods in restorative dentistry.
Main Methods:
- In vitro evaluation of shear bond strength using bovine incisors with three self-etching primers and one phosphoric acid control.
- Standardized Class 2 cavity preparations in human molars were restored using the tested bonding agents.
- Marginal adaptation was quantitatively analyzed using Scanning Electron Microscopy (SEM) after thermocycling and mechanical loading.
Main Results:
- Significant differences in shear bond strength were observed between groups, with Resulcin AquaPrime + MonoBond showing higher values.
- All tested groups, including the phosphoric acid control, demonstrated excellent marginal adaptation with minimal gaps (over 91% gap-free).
- No statistically significant differences in marginal adaptation were found between the self-etching primer groups and the conventional etching group.
Conclusions:
- Self-etching priming agents provide effective composite-to-enamel bond strength and excellent marginal integrity in Class 2 restorations.
- The use of self-etching primers can be considered a reliable alternative to conventional phosphoric acid pre-treatment in dental bonding.
- Further clinical studies are warranted to confirm the long-term performance of these materials in vivo.