TY - JOUR
T1 - Effect of indirect restorative material and thickness on light transmission at different wavelengths
AU - Pacheco, Rafael Rocha
AU - Carvalho, Adriana Oliveira
AU - André, Carolina Bosso
AU - Ayres, Ana Paula Almeida
AU - de Sá, Renata Bacelar Catanhede
AU - Dias, Tiago Monteiro
AU - Rueggeberg, Frederick
AU - Giannini, Marcelo
N1 - Funding Information:
This study was supported by grants from the Coordination for the Improvement of Higher Education Personnel (CAPES # 1777-2014 ) and the National Council for Scientific and Technological Development (CNPq # 307217-2014-0 ), Brazil.
Publisher Copyright:
© 2018 Japan Prosthodontic Society
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/4
Y1 - 2019/4
N2 - Purpose: The aim of this study was to evaluate the influence of indirect restorative material type and thickness on the transmission of different wavelengths from a broad-banded dental curing light. Methods: Four dental indirect restorative materials for computer-aided design and computer-aided manufacturing (CAD/CAM) were evaluated: [RC] resin/ceramic hybrid material (Lava Ultimate), [FC] feldspathic ceramic (VitaBlocs), and two zirconia-based ceramics ([ZK] Katana; and [ZL] Lava). Total loss of irradiance (TL) was measured for blue (W B, 425–490 nm) and violet (W V, 350–425 nm) wavelengths. Specimens of 15 × 15 mm with varying thicknesses (0.5, 1.0, 1.5, and 2.0 mm) were fabricated (n = 5). A plasma-arc dental light-curing unit was used (Arc Light-II). To assess TL as a function of wavelength, a software (Spectra Suite v5.1) connected to a spectroradiometer (USB2000) and an integrating sphere (CTSM-LSM-60-SF) was used. Data was subjected to statistical analysis (two-way ANOVA and post-hoc Tukey test, α = 0.05). Results: A 0.5 mm interposition resulted in TL from 50.5 to 67.2%, depending on material. Increased thickness resulted in higher TL for all materials. FC showed less TL compared to ZK. In general, W V showed higher TL than did W B, and W V /W B proportion decreased with increasing thickness. Conclusions: Indirect materials significantly reduced TL, and this effect is greater with increasing thickness. W V showed lower penetration compared to W B .
AB - Purpose: The aim of this study was to evaluate the influence of indirect restorative material type and thickness on the transmission of different wavelengths from a broad-banded dental curing light. Methods: Four dental indirect restorative materials for computer-aided design and computer-aided manufacturing (CAD/CAM) were evaluated: [RC] resin/ceramic hybrid material (Lava Ultimate), [FC] feldspathic ceramic (VitaBlocs), and two zirconia-based ceramics ([ZK] Katana; and [ZL] Lava). Total loss of irradiance (TL) was measured for blue (W B, 425–490 nm) and violet (W V, 350–425 nm) wavelengths. Specimens of 15 × 15 mm with varying thicknesses (0.5, 1.0, 1.5, and 2.0 mm) were fabricated (n = 5). A plasma-arc dental light-curing unit was used (Arc Light-II). To assess TL as a function of wavelength, a software (Spectra Suite v5.1) connected to a spectroradiometer (USB2000) and an integrating sphere (CTSM-LSM-60-SF) was used. Data was subjected to statistical analysis (two-way ANOVA and post-hoc Tukey test, α = 0.05). Results: A 0.5 mm interposition resulted in TL from 50.5 to 67.2%, depending on material. Increased thickness resulted in higher TL for all materials. FC showed less TL compared to ZK. In general, W V showed higher TL than did W B, and W V /W B proportion decreased with increasing thickness. Conclusions: Indirect materials significantly reduced TL, and this effect is greater with increasing thickness. W V showed lower penetration compared to W B .
KW - Ceramics
KW - Composite
KW - Irradiance
KW - Photopolymerization
KW - Zirconia
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U2 - 10.1016/j.jpor.2018.12.004
DO - 10.1016/j.jpor.2018.12.004
M3 - Article
C2 - 30598403
AN - SCOPUS:85059138928
SN - 1883-1958
VL - 63
SP - 232
EP - 238
JO - Nippon Hotetsu Shika Gakkai zasshi
JF - Nippon Hotetsu Shika Gakkai zasshi
IS - 2
ER -