Light Polymerization through Glass-ceramics: Influence of Light-polymerizing Unit's Emitted Power and Restoration Parameters (Shade, Translucency, and Thickness) on Transmitted Radiant Power.
Ra'fat I Farah, Ibrahim A Alblihed, Alhareth A Aljuoie, Bandar Alresheedi
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Abstract
Background: This in vitro study assessed light transmission through ceramic discs varying in shade, translucency, and thickness using light-polymerizing units with different radiant power/flux (RP) outputs.
Methods: Disc-shaped specimens (0.5 mm, 1.0 mm, and 2.0 mm) were made from high and low-translucency glass-ceramic ingots (IPS e.max Press) in shades A1 and A4, totaling 60 discs. Two light-polymerizing units with different power outputs were used, and their emission spectra were verified. The transmitted RP values for each ceramic specimen were measured and irradiance and radiant energy influx were calculated. Differences between the light-polymerizing units and the influence of the three ceramic parameters were evaluated using an independent-samples t-test and three-way analysis of variance (ANOVA) tests (α = 0.05).
Results: A statistically significant difference was observed in the mean transmitted RP values between the two light-polymerizing units. Furthermore, the three-way ANOVA test showed a significant effect of shade, translucency, and thickness, as well as a significant interaction between each pair of variables and all three variables on the transmitted RP (P < 0.05).
Conclusions: Despite the significant attenuation in the transmitted RP, especially in ceramics with higher shade chromaticity and thickness and lower translucency, the calculated minimal irradiance values for both light-polymerizing units (their emitted power ≥ 500 mW) were greater than the minimum recommended irradiance threshold (100 mW/cm2). However, the exposure duration needs to be increased to provide the resin with sufficient radiant exposure for adequate polymerization.
期刊介绍：
The journal Contemporary Clinical Dentistry (CCD) (Print ISSN: 0976-237X, E-ISSN:0976- 2361) is peer-reviewed journal published on behalf of Maharishi Markandeshwar University and issues are published quarterly in the last week of March, June, September and December. The Journal publishes Original research papers, clinical studies, case series strictly of clinical interest. Manuscripts are invited from all specialties of Dentistry i.e. Conservative dentistry and Endodontics, Dentofacial orthopedics and Orthodontics, Oral medicine and Radiology, Oral pathology, Oral surgery, Orodental diseases, Pediatric Dentistry, Periodontics, Clinical aspects of Public Health dentistry and Prosthodontics. Review articles are not accepted. Review, if published, will only be by invitation from eminent scholars and academicians of National and International repute in the field of Medical/Dental education.
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