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Curing profile of bulk-fill resin-based composites
Xin Li1, Pong Pongprueksa1, Bart Van Meerbeek1
1KU Leuven-BIOMAT, Department of Oral Health Sciences, KU Leuven (University of Leuven) & Dentistry, University Hospitals Leuven, Kapucijnenvoer 7, Blok A - Box 7001, BE-3000 Leuven, Belgium.
Journal of Dentistry
|January 20, 2015
Summary
This study found that flowable bulk-fill resin composites effectively cure at a 4mm depth, validating manufacturer claims. Light guide positioning is less critical for bulk-fill composites compared to conventional ones.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Spectroscopy
Background:
- Bulk-fill resin-based composites (RBCs) are designed for simplified placement.
- Understanding their curing profile is crucial for clinical success.
- Micro-Raman spectroscopy (μRaman) offers a detailed method for assessing conversion.
Purpose of the Study:
- To evaluate the curing profile of various bulk-fill RBCs.
- To compare their 'effective' curing parameters using μRaman.
- To determine the influence of curing parameters on the conversion profile.
Main Methods:
- Four bulk-fill RBCs and one conventional RBC were light-cured.
- 24-h degree of conversion (DC) was mapped using μRaman.
- Statistical analysis determined the impact of curing parameters.
Main Results:
- Flowable bulk-fill RBCs showed significantly larger 'effective' curing areas and depths.
- Effective curing depth decreased in the order: flowable bulk-fill > fibre-reinforced > full-depth bulk-fill ≈ conventional.
- Only flowable bulk-fill RBCs achieved effective 4mm depth cure across the specimen width.
Conclusions:
- Most bulk-fill RBCs achieve adequate cure at recommended depths.
- Curing profiles suggest light guide orientation is less critical for bulk-fill RBCs.
- This research validates bulk-fill RBC performance and offers insights into placement technique.
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