Ra'fat I Farah, Ibrahim A Alblihed, Alhareth A Aljuoie, Bandar Alresheedi
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Differences between the light-polymerizing units and the influence of the three ceramic parameters were evaluated using an independent-samples <i>t</i>-test and three-way analysis of variance (ANOVA) tests (α = 0.05).</p><p><strong>Results: </strong>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 (<i>P</i> < 0.05).</p><p><strong>Conclusions: </strong>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/cm<sup>2</sup>). However, the exposure duration needs to be increased to provide the resin with sufficient radiant exposure for adequate polymerization.</p>","PeriodicalId":10632,"journal":{"name":"Contemporary Clinical Dentistry","volume":null,"pages":null},"PeriodicalIF":0.9000,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11068246/pdf/","citationCount":"0","resultStr":"{\"title\":\"Light Polymerization through Glass-ceramics: Influence of Light-polymerizing Unit's Emitted Power and Restoration Parameters (Shade, Translucency, and Thickness) on Transmitted Radiant Power.\",\"authors\":\"Ra'fat I Farah, Ibrahim A Alblihed, Alhareth A Aljuoie, Bandar Alresheedi\",\"doi\":\"10.4103/ccd.ccd_124_23\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Background: </strong>This <i>in vitro</i> study assessed light transmission through ceramic discs varying in shade, translucency, and thickness using light-polymerizing units with different radiant power/flux (RP) outputs.</p><p><strong>Methods: </strong>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 <i>t</i>-test and three-way analysis of variance (ANOVA) tests (α = 0.05).</p><p><strong>Results: </strong>A statistically significant difference was observed in the mean transmitted RP values between the two light-polymerizing units. 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引用次数: 0
摘要
背景：这项体外研究使用具有不同辐射功率/流量（RP）输出的光聚合装置，评估了不同色调、半透明度和厚度的陶瓷圆盘的透光率：圆盘状试样（0.5 毫米、1.0 毫米和 2.0 毫米）由高透光度和低透光度玻璃陶瓷锭（IPS e.max Press）制成，色调为 A1 和 A4，共 60 个圆盘。使用了两种不同功率输出的光聚合装置，并对其发射光谱进行了验证。测量了每个陶瓷试样的透射 RP 值，并计算了辐照度和辐射能流入量。使用独立样本 t 检验和三方方差分析 (ANOVA) 检验（α = 0.05）评估了光聚合装置之间的差异和三个陶瓷参数的影响：结果：两种光聚合装置的平均透射 RP 值在统计学上存在明显差异。此外，三方方差分析测试表明，遮光率、半透明度和厚度对透射 RP 有显著影响，每对变量与所有三个变量之间也有显著的交互作用（P < 0.05）：尽管透射 RP 有明显的衰减，特别是在色度和厚度较高、半透明度较低的陶瓷中，但两种光聚合装置计算出的最小辐照度值（其发射功率≥ 500 mW）都大于推荐的最小辐照度阈值（100 mW/cm2）。不过，需要延长照射时间，以便为树脂提供足够的辐射照射，使其充分聚合。
Light Polymerization through Glass-ceramics: Influence of Light-polymerizing Unit's Emitted Power and Restoration Parameters (Shade, Translucency, and Thickness) on Transmitted Radiant Power.
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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