Effect of Simulated Pulpal Microcirculation on Temperature When Light Curing Bulk Fill Composites
| Autor: | Mth Ribeiro, Lrs Oliveira, Carlos José Soares, Abf Vilela, Richard B. Price, G. Da Silva, Braga Sl |
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| Rok vydání: | 2019 |
| Předmět: |
Curing Lights
Dental Materials science Microcirculation Temperature Bulk fill 030206 dentistry 02 engineering and technology Materials testing 021001 nanoscience & nanotechnology Composite Resins Light curing 03 medical and health sciences 0302 clinical medicine medicine.anatomical_structure Dentin Materials Testing medicine Humans Composite material 0210 nano-technology General Dentistry |
| Zdroj: | Operative Dentistry. 44:289-301 |
| ISSN: | 1559-2863 0361-7734 |
| DOI: | 10.2341/17-351-l |
| Popis: | SUMMARY Objectives: To evaluate the effect of light curing bulk fill resin composite restorations on the increase in the temperature of the pulp chamber both with and without a simulated pulpal fluid flow. Methods and Materials: Forty extracted human molars received a flat occlusal cavity, leaving approximately 2 mm of dentin over the pulp. The teeth were restored using a self-etch adhesive system (Clearfil SE Bond, Kuraray) and two different bulk fill resin composites: a flowable (SDR, Dentsply) and a regular paste (AURA, SDI) bulk fill. The adhesive was light cured for 20 seconds, SDR was light cured for 20 seconds, and AURA was light cured for 40 seconds using the Bluephase G2 (Ivoclar Vivadent) or the VALO Cordless (Ultradent) in the standard output power mode. The degree of conversion (DC) at the top and bottom of the bulk fill resin composite was assessed using Fourier-Transform Infra Red spectroscopy. The temperature in the pulp chamber when light curing the adhesive system and resin composite was measured using a J-type thermocouple both with and without the presence of a simulated microcirculation of 1.0-1.4 mL/min. Data were analyzed using Student t-tests and two-way and three-way analyses of variance (α=0.05 significance level). Results: The irradiance delivered by the light-curing units (LCUs) was greatest close to the top sensor of the MARC resin calibrator (BlueLight Analytics) and lowest after passing through the 4.0 mm of resin composite plus 2.0 mm of dentin. In general, the Bluephase G2 delivered a higher irradiance than did the VALO Cordless. The resin composite, LCU, and region all influenced the degree of cure. The simulated pulpal microcirculation significantly reduced the temperature increase. The greatest temperature rise occurred when the adhesive system was light cured. The Bluephase G2 produced a rise of 6°C, and the VALO Cordless produced a lower temperature change (4°C) when light curing the adhesive system for 20 seconds without pulpal microcirculation. Light curing SDR produced the greatest exothermic reaction. Conclusions: Using simulated pulpal microcirculation resulted in lower temperature increases. The flowable composite (SDR) allowed more light transmission and had a higher degree of conversion than did the regular paste (AURA). The greatest temperature rise occurred when light curing the adhesive system alone. |
| Databáze: | OpenAIRE |
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