Abstract
The effect of thickness, shade and translucency of CAD/CAM lithium disilicate glass-ceramic on light transmission of light-emitting diode (LED) and quartz-tungsten-halogen units (QTH) were evaluated. Ceramic IPS e.max CAD shades A1, A2, A3, A3.5, high (HT) and low (LT) translucency were cut (1, 2, 3, 4 and 5 mm). Light sources emission spectra were determined. Light intensity incident and transmitted through each ceramic sample was measured to determine light transmission percentage (TP). Statistical analysis used a linear regression model. There was significant interaction between light source and ceramic translucency (p=0.008) and strong negative correlation (R=-0.845, p<0.001) between ceramic thickness and TP. Increasing one unit in thickness led to 3.17 reduction in TP. There was no significant difference in TP (p=0.124) between shades A1 (ß1=0) and A2 (ß1=-0.45) but significant reduction occurred for A3 (ß1=-0.83) and A3.5 (ß1=-2.18). The interaction QTH/HT provided higher TP (ß1=0) than LED/HT (ß1=-2.92), QTH/LT (ß1=-3.75) and LED/LT (ß1=-5.58). Light transmission was more effective using halogen source and high-translucency ceramics, decreased as the ceramic thickness increased and was higher for the lighter shades, A1 and A2. From the regression model (R2=0.85), an equation was obtained to estimate TP value using each variable ß1 found. A maximum TP of 25% for QTH and 20% for LED was found, suggesting that ceramic light attenuation could compromise light cured and dual cure resin cements polymerization.
Highlights
Dentistry is going through the polymer and ceramic age
The objective of this both QTH and light-emitting diodes (LED) illumination (Fig. 1) and remained study was to evaluate the effect of the thickness, shade unchanged up to 10 min after thermal stability of the lamp and translucency of a CAD/CAM lithium disilicate glasswire filament of each appliance, since after heating the ceramic on the percentage of light transmission from both power emitted by these lamps tended to be more stable
transmission percentage (TP) results obtained for each ceramic sample as a function of thickness, shade, and translucency are in Figures 2 and 3 for QTH and LED sources, respectively
Summary
Dentistry is going through the polymer and ceramic age. Metal-free ceramic restorations present excellent aesthetics, biocompatibility, long-term stability and ability to mimic the tooth shade [1,2]. From the light source characterization should receive enough light intensity to achieve proper experiments, the initial emission spectra were similar for polymerization and optimal properties The objective of this both QTH and LED illumination (Fig. 1) and remained study was to evaluate the effect of the thickness, shade unchanged up to 10 min after thermal stability of the lamp and translucency of a CAD/CAM lithium disilicate glasswire filament of each appliance, since after heating the ceramic on the percentage of light transmission from both power emitted by these lamps tended to be more stable. The thickness of each specimen was measured with a digital caliper and several points were plotted on a thickness x light transmission
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