Bulk-Fill Composites: Effectiveness of Cure With Poly- and Monowave Curing Lights and Modes
| Autor: | J K Gan, J W Cheong, Cbk Tan, Adrian Ujin Yap, N Arista |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Curing Lights
Dental Materials science Surface Properties Bulk fill 02 engineering and technology Indentation hardness Composite Resins Polymerization 03 medical and health sciences Dental Materials 0302 clinical medicine Hardness Materials Testing Dentin medicine Statistical analysis Composite material General Dentistry Curing (chemistry) Light-Curing of Dental Adhesives Hardness ratio Significant difference 030206 dentistry 021001 nanoscience & nanotechnology medicine.anatomical_structure Knoop hardness test 0210 nano-technology |
| Zdroj: | Operative dentistry. 43(2) |
| ISSN: | 1559-2863 |
| Popis: | SUMMARY This study compared the effectiveness of cure of bulk-fill composites using polywave light-emitting diode (LED; with various curing modes), monowave LED, and conventional halogen curing lights. The bulk-fill composites evaluated were Tetric N-Ceram bulk-fill (TNC), which contained a novel germanium photoinitiator (Ivocerin), and Smart Dentin Replacement (SDR). The composites were placed into black polyvinyl molds with cylindrical recesses of 4-mm height and 3-mm diameter and photopolymerized as follows: Bluephase N Polywave High (NH), 1200 mW/cm2 (10 seconds); Bluephase N Polywave Low (NL), 650 mW/cm2 (18.5 seconds); Bluephase N Polywave soft-start (NS), 0-650 mW/cm2 (5 seconds) → 1200 mW/cm2 (10 seconds); Bluephase N Monowave (NM), 800 mW/cm2 (15 seconds); QHL75 (QH), 550 mW/cm2 (21.8 seconds). Total energy output was fixed at 12,000 mJ/cm2 for all lights/modes, with the exception of NS. The cured specimens were stored in a light-proof container at 37°C for 24 hours, and hardness (Knoop Hardness Number) of the top and bottom surfaces of the specimens was determined using a Knoop microhardness tester (n=6). Hardness data and bottom-to-top hardness ratios were subjected to statistical analysis using one-way analysis of variance/Scheffe's post hoc test at a significance level of 0.05. Hardness ratios ranged from 38.43% ± 5.19% to 49.25% ± 6.38% for TNC and 50.67% ± 1.54% to 67.62% ± 6.96% for SDR. For both bulk-fill composites, the highest hardness ratios were obtained with NM and lowest hardness ratios with NL. While no significant difference in hardness ratios was observed between curing lights/modes for TNC, the hardness ratio obtained with NM was significantly higher than the hardness ratio obtained for NL for SDR. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|