Effect of Light Intensity and Curing Time on Color Stability of a Methacrylate-Based Composite Resin Using an LED Light-Curing Unit
| Autor: | Negin Farahmandpour, Maryam Zali Moghadam, Hosna Teimourian, Narges Panahandeh, Hoda Pouyanfar |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
business.industry
Composite number 030206 dentistry Methacrylate light intensity color 030218 nuclear medicine & medical imaging lcsh:RK1-715 Light curing 03 medical and health sciences Curing time Light intensity 0302 clinical medicine curing light Distilled water lcsh:Dentistry Immersion (virtual reality) Medicine Composite material business composite resin time Curing (chemistry) |
| Zdroj: | Dental journal of Hamadan University of Medical Sciences, Vol 11, Iss 3, Pp 83-88 (2019) |
| ISSN: | 2423-7582 2008-7659 |
| DOI: | 10.34172/ajdr.2019.16 |
| Popis: | Background: Despite improvements in the optical properties of composite resins, their color stability is still a matter of discussion. This study sought to assess the effect of light intensity and curing time by a light-emitting diode (LED) light-curing unit on color stability of a methacrylate-based composite resin. Methods: In this in vitro study, 60 discs (8 × 2 mm) were fabricated of A2 shade of Z250 composite. Specimens were polished and divided into 4 groups (n=15) for curing for 20 or 40 seconds with a light intensity of 600 or 1200 mW/cm2 . After immersion in distilled water at 37°C for 24 hours, colorimetry was performed using a spectroradiometer. The specimens were then immersed in tea solution for 7 days (3 times a day, each time for one hour) and were subjected to colorimetry again. Color change (∆E) was calculated and analyzed using two-way ANOVA. Results: Significant color change was noted following an increase in curing time (P0.05). The interaction effect of light intensity and curing time on color change was significant (P |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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