Analysis of factors influence the power density of light curing units
10.3760/cma.j.issn.1002-0098.2012.s1.059
- VernacularTitle:光固化灯功率密度的影响因素分析
- Author:
Shu-Li DENG
1
;
Cong LI
;
Hai-Hua ZHU
;
Hui CHEN
Author Information
1. 浙江大学医学院附属口腔医院牙体牙髓科
- Keywords:
Composite resins;
Curing light;
Power density
- From:
Chinese Journal of Stomatology
2012;47(z1):263-266
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze factors that influence the power density of light curing units.Methods The power density values of 104 curing-light units from two dental hospitals in Hangzhou were investigated.Three lights among them with different power density were used to project to the radiometer sensor at different distances and angles.The power density was measured also when the curing tips were coated with protective sleeve or not.Results The values of power density were from 0 to 1180 mW/cm2.The mean power density was (519.7 ± 294.5) mW/cm2.With the curing distance increasing,the power densities were decreased significantly (P ＜ 0.05).When the distance was 8 mm,the power densities were (545.7 ± 25.1),(448.0 ± 22.7) and (200.0 ± 7.5) mW/cm2.The power densities decreased to (269.0 ± 3.0),(265.3 ± 26.8) and (129.7 ± 4.7) mW/cm2 as the projecting angle increased to 60°.There was statistically significant difference in power density between the curing tips with or without protective sleeve (P ＜ 0.05).Conclusions The factors that influence power density of light-curing units were the curing distance,projected angle and protective sleeve.
