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Environmental SEM and dye penetration observation on resin-tooth interface using different light curing method.
Takako Yoshikawa1, Makoto Morigami, Alireza Sadr
1Cariology and Operative Dentistry, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU).
Dental Materials Journal
|February 3, 2016
Summary
The slow-start light curing method improves resin composite adaptation and marginal sealing in teeth, reducing polymerization stress. This method showed better results than conventional light curing in dental restorations.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Polymer Chemistry
Background:
- Marginal integrity and adaptation of resin composites are crucial for the longevity of dental restorations.
- Light curing methods can influence polymerization stress, potentially affecting the marginal seal and adaptation of dental materials.
- Understanding the impact of different curing techniques is essential for optimizing clinical outcomes.
Purpose of the Study:
- To evaluate the effects of conventional versus slow-start light curing methods on the marginal sealing and adaptation of resin composites.
- To compare the efficacy of two different light curing strategies in preventing microleakage.
- To investigate the relationship between polymerization stress compensation and marginal integrity.
Main Methods:
- Preparation of cylindrical cavities in the cervical regions of teeth.
- Restoration of cavities using Clearfil Liner Bond 2 V adhesive and Clearfil Photo Bright or Palfique Estelite resin composites.
- Application of conventional or slow-start light curing methods.
- Thermal cycling of specimens followed by dye penetration testing.
- Evaluation of resin-tooth interfaces using environmental scanning electron microscopy (SEM).
Main Results:
- The slow-start curing method demonstrated superior marginal sealing and resin composite adaptation compared to the conventional method.
- Environmental SEM observations correlated highly with dye penetration test results, confirming the findings.
- Increased contrast ratios during polymerization with the slow-start method indicated effective compensation for polymerization stress.
Conclusions:
- The slow-start light curing method is effective in enhancing marginal sealing and adaptation of resin composites.
- This technique appears to mitigate polymerization stress, leading to improved restoration quality.
- Both dye penetration tests and environmental SEM are reliable methods for assessing marginal integrity in dental restorations.
