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Self-etching primer systems: changes in dentin bond strength with time.

Toru Maeda¹, Akira Yamamoto, Mika Iwasa

¹Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan.

Journal of Oral Science

|September 25, 2009

Summary

Dentin bond strength of resin composites using self-etching primer systems increases over time. Allow adequate maturation before functional loading to ensure restoration longevity.

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Area of Science:

Dental Materials Science
Adhesive Dentistry
Biomaterials Engineering

Background:

Self-etching primer systems are crucial for resin composite bonding to dentin.
Understanding the development of bond strength over time is essential for clinical success.
Variability in bond strength can impact the longevity of dental restorations.

Purpose of the Study:

To investigate the development of shear bond strength in resin composites utilizing self-etching primer systems.
To evaluate how different self-etching primer systems and resin composite combinations affect bond strength maturation.
To determine the time-dependent changes in dentin bond strength for various adhesive materials.

Main Methods:

Four self-etching primer systems with their recommended resin composites were tested.
Bovine incisors were prepared to expose dentin surfaces.
Shear bond strengths were measured at multiple time points (5 min to 24 h) after storage in distilled water at 37°C.

Main Results:

Dentin bond strengths significantly increased with prolonged storage time for all tested materials.
Statistical analysis (ANOVA and Dunnett's test) confirmed significant differences in bond strength development over time.
The rate of bond strength development varied among the different self-etching primer systems and composite combinations.

Conclusions:

Dentin bond strength development is a time-dependent process for self-etching primer systems.
Clinical implications exist regarding the immediate functional loading of restorations placed with these systems.
Adequate maturation time for resin composite bonds is critical before subjecting restorations to functional stress.