Effect of Thickness on Light Transmission and Vickers Hardness of Five Bulk-fill Resin-based Composites Using Polywave and Single-peak Light-emitting Diode Curing Lights
| Autor: | Hanan Alzraikat, Nessrin A. Taha, GA Maghaireh, N Abdo, Richard B. Price |
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| Rok vydání: | 2019 |
| Předmět: |
Curing Lights
Dental Light transmission Materials science Surface Properties 0206 medical engineering Bulk fill 02 engineering and technology Materials testing Methacrylate Composite Resins Indentation hardness Polymerization law.invention Dental Materials 03 medical and health sciences 0302 clinical medicine law Materials Testing Hardness Tests Composite material General Dentistry Curing (chemistry) Light-Curing of Dental Adhesives 030206 dentistry 020601 biomedical engineering Vickers hardness test Methacrylates Light-emitting diode |
| Zdroj: | Operative Dentistry. 44:96-107 |
| ISSN: | 1559-2863 0361-7734 |
| DOI: | 10.2341/17-163-l |
| Popis: | SUMMARY Objectives: This study compared light transmission through different thicknesses of bulk-fill resin-based composites (RBCs) using a polywave and a single-peak light-emitting diode light-curing unit (LCU). The effect on the surface hardness was also evaluated. Methods: Five bulk-fill RBCs were tested. Specimens (n=5) of 1-, 2-, 4-, or 6-mm thickness were photopolymerized for 10 seconds from the top using a polywave (Bluephase Style) or single–peak (Elipar S10) LCU, while a spectrophotometer monitored in real time the transmitted irradiance and radiant exposure reaching the bottom of the specimen. After 24 hours of storage in distilled water at 37°C, the Vickers microhardness (VH) was measured at top and bottom. Results were analyzed using multiple-way analysis of variance, Tukey post hoc tests, and multivariate analysis (α=0.05). Results: The choice of LCU had no significant effect on the total amount of light transmitted through the five bulk-fill RBCs at each thickness. There was a significant decrease in the amount of light transmitted as the thickness increased for all RBCs tested with both LCUs (p Conclusions: The total amount of light transmitted through the five bulk-fill RBCs was similar at the different thicknesses using either LCU. The polywave LCU used in this study did not enhance the polymerization of the tested bulk-fill RBCs when compared with the single-peak LCU. |
| Databáze: | OpenAIRE |
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