title: Power density of various light curing units through resin inlays with modified layer thickness.
abstract: OBJECTIVE
  The purpose of this study was to enhance curing light penetration through resin inlays by modifying the thicknesses of the dentin, enamel, and translucent layers.
  
  
  METHODS
  To investigate the layer dominantly affecting the power density of light curing units, resin wafers of each layer with 0.5 mm thickness were prepared and power density through resin wafers was measured with a dental radiometer (Cure Rite, Kerr). The dentin layer, which had the dominant effect on power density reduction, was decreased in thickness from 0.5 to 0.1 mm while thickness of the enamel layer was kept unchanged at 0.5 mm and thickness of the translucent layer was increased from 0.5 to 0.9 mm and vice versa, in order to maintain the total thickness of 1.5 mm of the resin inlay. Power density of various light curing units through resin inlays was measured.
  
  
  RESULTS
  Power density measured through 0.5 mm resin wafers decreased more significantly with the dentin layer than with the enamel and translucent layers (p < 0.05). Power density through 1.5 mm resin inlays increased when the dentin layer thickness was reduced and the enamel or translucent layer thickness was increased. The highest power density was recorded with dentin layer thickness of 0.1 mm and increased translucent layer thickness in all light curing units.
  
  
  CONCLUSIONS
  To enhance the power density through resin inlays, reducing the dentin layer thickness and increasing the translucent layer thickness would be recommendable when fabricating resin inlays.
authors: Department of Conservative Dentistry, Wonkwang University College of Dentistry and Dental Research Institute, Iksan, Korea.
authors: Sung-Ok
authors: SO
authors: Hong
authors: Yonghui
authors: Y
authors: Oh
authors: Jeong-Bum
authors: JB
authors: Min
authors: Jin-Woo
authors: JW
authors: Kim
authors: Bin-Na
authors: BN
authors: Lee
authors: Yun-Chan
authors: YC
authors: Hwang
authors: In-Nam
authors: IN
authors: Hwang
authors: Won-Mann
authors: WM
authors: Oh
authors: Hoon-Sang
authors: HS
authors: Chang
keywords: Dental radiometer; Layer thickness; Power density; Resin inlay