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Submitted: 15 Jun 2019
Accepted: 15 Sep 2019
ePublished: 29 Sep 2019
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Avicenna J Dent Res. 2019;11(3): 83-88.
doi: 10.34172/ajdr.2019.16
  Abstract View: 160
  PDF Download: 11

Original Article

Effect of Light Intensity and Curing Time on Color Stability of a Methacrylate-Based Composite Resin Using an LED Light-Curing Unit

Hosna Teimourian 1 ORCID logo, Negin Farahmandpour 1, Maryam Zali Moghadam 2, Hoda Pouyanfar 1, Narges Panahandeh 3* ORCID logo

1 Department of Operative and Esthetic Dentistry, Faculty of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran
2 Students Research Committee, Faculty of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran
3 Dental Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
*Correspondence to Narges Panahandeh, DDS MDS, Assistant Professor, Dental Research Center, Research Institute of Dental Sciences, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Tel: +982122413897, Fax: +982122427753, Email: nargespanahandeh@yahoo.com

Abstract

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 (P<0.05). No improvement in color stability was noted after increasing the light intensity (P>0.05). The interaction effect of light intensity and curing time on color change was significant (P<0.05).

Conclusions: Curing time is an important factor affecting the color stability of composite resin polymerized with LED light curing unit. On the other hand, increasing the light intensity over the standard threshold showed no significant effect.

Keywords: Color, Composite Resin, Curing light, Light Intensity, Time
Citation: Teimourian H, Farahmandpour N, Zali Moghadam M , Pouyanfar H, Panahandeh N. Effect of Light Intensity and Curing Time on Color Stability of a Methacrylate-Based Composite Resin Using an LED Light-Curing Unit. Avicenna J Dent Res. 2019;11(3):83-88. doi: 10.34172/ajdr.2019.16.
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