The effects of shade and light irradiation on the polymerization of composite resin core materials
10.3969/j.issn.1001-3733.2017.01.002
- VernacularTitle:颜色及光照射条件对复合树脂核材料聚合的影响
- Author:
Zeming WU
;
Shaowei HE
;
Xiangfeng MENG
- Keywords:
Composite resin core material;
Shade;
Light intensity;
Microhardness
- From:
Journal of Practical Stomatology
2017;33(1):10-13
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To evaluate the effects of shade and light irradiation condition on the polymerization of composite resin core material.Methods:The light-proof silicon rubber cuboid mold with one end open were stringed and filled by dual-cured flowable composite resin core material with the shade of dentine and white(Paracore) respectively,then the open end of mold was irradiated directly by a light unit at 1 000 mW/cm2 ×20 s and 3 200 mW/cm2 ×6 s respectively.And all specimens of 4 groups(n =5) were stored in the light-proof box.1 h and 24 h after irradiation,Knoop microhardness was measured along the vertical surfaces of the specimens at the depth of 1,2 and 3 mm respectively.Data were analyzed by One-way ANOVA.Results:At all light irradiation conditions,the hardness of all specimens decreased with the increase of measurement depth.24 h after irradiation,the hardness of dentine shade specimens at each measurement depth showed no difference between 1 000 mW/cm2 × 20 s and 3 200 mW/cm2 × 6 s irradiation,while the white shade specimens irradiated by 1 000 mW/cm2 × 20 s showed higher hardness than those by 3 200 mW/cm2 × 6 s.Conclusion:To obtain sufficient polymerization of composite core material with different shade optimal light irradiation condition should be selected.
