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Phosphoric acid as a conditioning agent in the Gluma bonding system
1Department of Operative Dentistry, Hokkaido University, School of Dentistry, Sapporo, Japan.
American Journal of Dentistry
|October 1, 1995
Summary
Phosphoric acid conditioning of dentin is compatible with the Gluma bonding system, showing adequate dentin bonding and cavity sealing regardless of acid concentration, silica content, or conditioning time. This ensures reliable dental restorations.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials
Background:
- The Gluma dentin bonding system is widely used in restorative dentistry.
- Optimizing dentin surface preparation is crucial for durable adhesive restorations.
- Investigating the compatibility of various phosphoric acid etchants with dentin bonding systems is essential for clinical success.
Purpose of the Study:
- To evaluate the compatibility of phosphoric acid conditioning gels with the Gluma dentin bonding system.
- To determine the influence of phosphoric acid concentration, silica content, and etching duration on bonding efficacy.
- To assess the impact of dentin pretreatment on bond strength, marginal integrity, and microleakage.
Main Methods:
- Shear bond strengths (SBS) were measured to assess adhesive performance.
- Marginal gap formation and microleakage were evaluated in dentin cavities after thermocycling.
- Hybrid layer thickness was determined using light microscopy.
- Dentin was pretreated with varying concentrations of phosphoric acid (5-35%) and silica (0-10%) for different durations (15-120 seconds).
Main Results:
- No significant differences in SBS or marginal performance were observed across tested phosphoric acid concentrations, silica contents, or conditioning times (P > 0.05).
- Hybrid layer thickness did not correlate with bond strength or marginal performance.
- SBS on dentin were comparable to those on acid-etched enamel (approximately 17 MPa).
- Adequate dentin bonding and cavity sealing were confirmed by marginal performance and microleakage results.
Conclusions:
- Phosphoric acid etching of dentin is compatible with the Gluma bonding system.
- The tested parameters of phosphoric acid concentration, silica content, and conditioning duration do not significantly affect the performance of the Gluma system on dentin.
- The Gluma bonding system provides reliable dentin bonding and marginal seal when used with phosphoric acid etching.