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Enamel shear bond strengths after vital bleaching
R S McGuckin1, B A Thurmond, S Osovitz
1Dental Branch, University of Texas Health Science Center, Houston, 77225.
American Journal of Dentistry
|August 1, 1992
Summary
This study found that the timing of dental bonding after vital bleaching significantly impacts enamel bond strength. Optimal bonding occurs later, avoiding early post-bleaching application for better dental restoration durability.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Vital bleaching procedures can affect the surface properties of tooth enamel.
- The interaction between bleaching agents and dental bonding agents is critical for restoration longevity.
- Understanding the optimal time for bonding after bleaching is essential for clinical success.
Purpose of the Study:
- To evaluate the effect of different vital bleaching treatments on enamel bond strength.
- To determine the influence of time intervals after bleaching termination on shear bond strength.
- To compare the performance of different bonding agents in conjunction with bleaching.
Main Methods:
- 160 extracted human anterior teeth were subjected to three bleaching treatments (Superoxol, Proxigel, White & Brite).
- Bonding agents (Scotchbond Dual Cure, Scotchbond 2) were applied at various time intervals (1, 6, 24 hours; 3, 7 days) post-bleaching.
- Enamel shear bond strength (SBS) was measured using Instron testing after 24 hours, with 32 groups (n=5).
Main Results:
- Significant differences in SBS were found based on bleaching treatment, bonding agent, and time interval post-bleaching.
- The time interval after bleaching termination significantly influenced bond strength, with later intervals showing better results.
- Scanning electron microscopy indicated that increased voids in the bond area correlated with lower mean bond strengths.
Conclusions:
- The timing of dental bonding after vital bleaching is a critical factor influencing enamel shear bond strength.
- Later time intervals post-bleaching generally result in higher and more reliable enamel bond strengths.
- Clinicians should consider the time elapsed since vital bleaching before performing dental bonding procedures to ensure optimal restoration outcomes.