Optical Characterization of Bulk-fill Resin Composites | ||
| Al-Azhar Journal of Dental Science | ||
| Volume 27, Issue 2, April 2024, Pages 161-169 PDF (574.71 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ajdsm.2023.253022.1479 | ||
| Authors | ||
| Rana Abdelrehim Sedky* 1; Dena Safwat Mustafa2 | ||
| 1Lecturer, Operative Dentistry Department, Faculty of Dentistry, Ain-Shams University | ||
| 2Lecturer, Operative Dentistry Department, Faculty of Dentistry, Ain Shams University | ||
| Abstract | ||
| Objective: This study was conducted to evaluate the light irradiance travelling through bulk-fill resin composites of different filler volumes and incremental thicknesses cured at different light curing distances. Materials and Methods: Forty specimens (n=5) were prepared according to the three levels of the study; filler volume of the bulk-fill resin composite; Filtek™ Bulk Fill Flowable Restorative (BF) and Filtek™ Bulk Fill Posterior Restorative (BP) (3M ESPE, St. Paul, MN, USA), increment thickness (2- or 4-mm thick increment) and light curing distance (zero mm or at 10 mm). Light intensity transmitted to the bottom of the specimen was monitored using a radiometer (P-9710, Gigahertz Optik GmbH, Germany) for 30 seconds from the start of light curing. Additionally, the light attenuation coefficient of bulk-fill materials was calculated. Specimens of 20mm diameter and 1 mm thickness were prepared to measure the contrast ratio for both bulk fill resin composite materials(n=5). Data was statistically analyzed at (α = .05). Results: Three- way ANOVA showed statistically significant difference of the three levels of the study for both transmitted light irradiance and light attenuation coefficient(p<0.0001). The highest light intensity transmitted was for BR-2mm at Zero Distance (116.20±3.18) while least light transmitted with in BF-4mm. The mean contrast ratio calculated for BF was 0.95± 0.01 and for BR 0.97± 0.01(p=0.0170). Conclusions: Filler volume contributes to light attenuation of bulk-fill composites. Increment thickness and light curing distance should be accounted for to ensure proper curing of resin composite at its deepest portion. | ||
| Keywords | ||
| Light attenuation; Bulk-fill Composites; Light curing; Filler volume; Increment thickness | ||
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