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Micro-cracking of tooth structure
Christina Sehy1, James L Drummond
1Department of Restorative Dentistry, College of Dentistry, University of Illinois, Chicago 60612-7212, USA.
American Journal of Dentistry
|December 4, 2004
Summary
This study found no significant micro-cracks in tooth structure when using either a dental handpiece or an Er:YAG laser for cavity preparation before composite filling. The research did not confirm micro-crack formation at the composite-tooth interface.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Laser Dentistry
Background:
- Micro-cracks in dental restorations can compromise their longevity and lead to secondary caries.
- Understanding the initiation of micro-cracks during cavity preparation is crucial for improving restorative techniques.
Purpose of the Study:
- To investigate whether high-speed dental handpieces or Er:YAG lasers cause micro-cracks during cavity preparation.
- To assess micro-crack formation before and after composite placement and curing.
Main Methods:
- Class I and Class II MOD preparations were made in extracted molars using a high-speed handpiece or an Er:YAG laser.
- Composite was placed and bulk cured under conditions designed to maximize interfacial stress.
- Teeth were sectioned and examined using scanning electron microscopy (SEM) for micro-cracks.
Main Results:
- SEM analysis revealed no significant or consistent micro-cracking in the tooth structure across all tested specimens.
- The study could not confirm the formation of micro-cracks at the composite/enamel or composite/dentin interfaces.
Conclusions:
- Neither high-speed dental handpiece nor Er:YAG laser preparation methods consistently induced micro-cracks in this study.
- Further research may be needed to fully elucidate the role of preparation methods in micro-crack initiation.