Comparison of Degree of Conversion (DC) and Depth of Cure (DoC) of Bulk Fill Composites and Filtek Supreme Ultra as the Conventional
Abstract
Introduction: Resin based composites go through a process of polymerization. Degree of conversion (DC) is the percentage of methacrylate carbon double bonds that are converted to single bonds during the curing reaction and is a reflection of the degree of polymerization. A high DC correlates to improved mechanical properties, chemical stability, and longevity of the restoration. Recently, manufacturers have developed bulk fill resin composite that can be placed in 4mm or 5mm increments. Objective: The aim of this study is to evaluate the degree of conversion (DC) and depth of cure (DoC) for bulk fill composites in comparison with a traditional incremental composite. Methods: Five bulk fill composite brands; Surefil SDR+ (SDRFP), Tetric Evoceram (TECB), Filtek 1 Bulk Fill (F1B), Venus Bulk Fill (VB), Sonicfill 3 (SF3); and 1 conventional resin composite Filtek Supreme Ultra (FSU) were investigated. Sample heights were 3mm and 5mm. The specimens were light cured for 20 seconds with irradiance of 2031+ 5mW/cm2. A Fourier transform infrared attenuated total reflection (FTIR-ATR) Perkin Elmer Spectrum 400 spectrometer was used to measure DC. Realtime recording of the infrared (IR) spectrum began immediately after curing to 15 minutes and 24 hours after curing. In addition, DoC in accordance to ISO 4049:2000 for each material was tested. Mean DC and mean DoC values were compared using repeated measures of analysis of variances (ANOVA) and comparison of all pair using Tukey and Kramer HSD. Results: Mean DC for the six materials with 5mm curing height after 24 hours were 79.5% for TECB, 75.7% for VB, 69.2% for SDRFP, 65.8% for SF3, 51.8% for F1B, and 44.0% for FSU. Mean depth of cure were 5.059mm for VB, 4.624mm for SDRFP, 3.803mm for F1B, 3.450mm for TECB, 2.966mm for FSU, 2.684mm for SF3. TECB and VB had the highest DC. DoC, VB had the highest while the newest product SF3 had significantly the lower DoC.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 2020
- Accession Number
- AD1182720
Entities
People
- Christy I Lee
Organizations
- Uniformed Services University of the Health Sciences