[Degree of double conversion in nine pit and fissure sealants].

Odontostomatologike proodos Pub Date : 1989-10-01
L Papagiannoulis, G Eliades
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Abstract

The purpose of the study was to evaluate quantitatively the degree of double bond conversion in nine commercially available pit and fissure sealants. The materials selected for the study were a) Nuva-Seal and Nuva Coat-UV cured b) Delton, Helioseal, Pentra Seal, Prisma Shield, Visioseal-Visible light cured and c) Delton, Concise White-Chemically cured. Infrared spectroscopy of monomer and polymer films, was used for the quantitative analysis at 37 degrees C. Monomer spectra were obtained from liquid films enclosed between two KBr plates while polymer spectra 24h after storage from 0.2 mm thick cylindrical specimens of 10mm diameter exposed to the activating lights for 1 min or mixed according to manufacturers. The results indicate that UV-cured materials provide the highest degree of double bond conversion followed by visible light cured systems. The clinical failure of UV-cured systems, despite their higher conversion rates is probably attributed to stabilization and shelf life problems of the catalyst besides the harmful side effects of UV-radiation which limited the utilization of these systems.

[9种坑缝密封胶的双重转换程度]。
该研究的目的是定量评价9种市售的坑和裂隙密封剂的双键转换程度。本研究选择的材料是a) Nuva-Seal和Nuva Coat-UV固化;b) Delton, Helioseal, Pentra Seal, Prisma Shield, visioseal -可见光固化;c) Delton,简明白色化学固化。单体和聚合物薄膜的红外光谱,在37℃下进行定量分析,单体光谱从封闭在两个KBr板之间的液膜中获得,聚合物光谱从直径为10mm的0.2 mm厚圆柱形样品在激活灯下暴露1min或根据制造商混合后24h获得。结果表明,紫外光固化材料的双键转化率最高,其次是可见光固化体系。尽管uv固化系统的转化率较高,但其临床失败可能归因于催化剂的稳定性和保质期问题,以及紫外线辐射的有害副作用,这些副作用限制了这些系统的利用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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