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Micro-tensile bond strength to surface and subsurface enamel
Rania Hadad1, Ross S Hobson, John F McCabe
1Department of Child Dental Health, School of Dental Sciences, University of Newcastle upon Tyne, Newcastle upon Tyne, UK. rania.hadad@ncl.ac.uk
Summary
Subsurface enamel exhibits significantly higher bond strength than surface enamel when using orthodontic adhesives. This finding is crucial for improving bonding techniques in restorative dentistry and orthodontics.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Adhesive Dentistry
Background:
- Bond strength testing to enamel traditionally assumes surface and subsurface enamel are identical.
- The micro-tensile bond strength (MTBS) method is increasingly used for dental adhesive evaluation.
- Limited research exists on MTBS comparing surface and subsurface enamel with orthodontic adhesives.
Purpose of the Study:
- To investigate the micro-tensile bond strength (MTBS) of Transbond composite to both surface and subsurface enamel.
- To compare the bond strength of a specific orthodontic adhesive to different enamel preparations.
Main Methods:
- Ten human molars were divided into two groups: surface enamel removed (group 1) and intact surface enamel (group 2).
- Transbond composite was applied to enamel using Transbond XT primer and light-cured.
- Specimens were sectioned into hourglass shapes and tested for MTBS using a universal testing machine.
Main Results:
- The mean MTBS for surface enamel was 31.2 MPa (SD 14.5).
- The mean MTBS for subsurface enamel was 47.9 MPa (SD 15.0).
- A statistically significant difference (P = 0.001) was observed between the two groups.
Conclusions:
- Subsurface enamel demonstrates significantly higher bond strength compared to surface enamel.
- These findings have important implications for bonding efficacy in restorative dentistry and orthodontic bracket adhesion.
- Optimizing bonding strategies may involve considering enamel surface characteristics.