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Bond angle effects on microtensile bonds: laboratory and FEA comparison
Nelson R F A Silva1, Christine S Calamia, Masly Harsono
1Department of Biomaterials and Biomimetics, Department of Prosthodontics, New York University, College of Dentistry, 345 East 24th Street, Room 804, New York City, NY 10010, USA.
Dental Materials : Official Publication of the Academy of Dental Materials
|September 13, 2005
Summary
Bond strength decreases with increasing angled interfaces for dental adhesives. Thicker adhesive layers increase stress, impacting bond durability in microtensile tests.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Adhesive Dentistry
Background:
- Dental adhesive bond strength is critical for restoration longevity.
- Interface angulation and adhesive thickness are potential factors influencing bond integrity.
- Finite Element Analysis (FEA) can model stress distribution in adhesive joints.
Purpose of the Study:
- To investigate the effect of varying bond angles (10, 20, 30 degrees) on the microtensile bond strength of two dental adhesives (Clearfil SE Bond and Single Bond).
- To evaluate the influence of adhesive layer thickness on stress levels within angled adhesive interfaces using FEA.
- To test the hypothesis that reduced bond strength occurs with increased interface angulation.
Main Methods:
- Microtensile bond strength testing was performed on 24 human molars with prepared dentin surfaces bonded with Clearfil SE Bond and Single Bond.
- Teeth were sectioned at 0 (control), 10, 20, and 30 degrees to the bonding interface.
- FEA was utilized to analyze maximum principal stress (MPS) in relation to bond angle and adhesive thickness (20-200 microm).
Main Results:
- Bond strength significantly decreased as interface angulation increased for both adhesives.
- The hypothesis was fully supported for Single Bond and partially for Clearfil SE Bond.
- FEA showed a trend of decreasing MPS with increasing bond angle, but increasing MPS with greater adhesive thickness.
Conclusions:
- Angled interfaces reduce dental adhesive bond strength, with Single Bond showing a greater sensitivity.
- Increased adhesive layer thickness elevates stress concentrations within the adhesive joint.
- FEA results correlate with experimental bond strength findings, highlighting the importance of interface preparation and adhesive thickness.