IADR Abstract Archives
Correlation Between Translucency and Light Irradiance Through Clear PVS Materials
Objectives: Clear PVS materials can be used as a matrix through which composite is cured. This study evaluated the correlation between the translucency and light irradiance through clear PVS materials.
Methods: Specimens (n=5) of 4 clear PVS materials (see tables) were dispensed into Teflon molds (diameter=12mm) of 5 different thicknesses (2mm, 4mm, 6mm, 8mm, 10mm). Specimens were placed against calibrated white and black backgrounds and L*a*b* values were taken using a spectrophotometer (CM-700d; Konica Minolta). The translucency parameter was measured as the difference in color using ΔE00. For light irradiance, each PVS specimen was placed onto a spectrophotometer‘s sensor (MARC Light Collector, BlueLight Analytics) to measure irradiance transmitted through the specimens from a light curing unit (Valo Cord, Ultradent, irradiance=1100mW/cm2). All specimens were light-exposed in the Standard mode for 5s (V100045, Valo Corded, Ultradent). The irradiance (mW/cm2) was calculated by dividing the power (mW) by the 10mm diameter of the integrating sphere aperture (A=0.785cm2). Translucency and light irradiance were analyzed separately through two-way ANOVA (factors: brand and thickness) and Tukey post-hoc run where appropriate. Correlation between translucency and light irradiance of materials for each thickness was evaluated with Pearsons coefficient using SPSS.
Results: The mean ± standard deviation of the translucency and light irradiance are presented (see tables). Two-way ANOVA was significant for both factors and their interaction (p<.01), so individual one-way ANOVA and Tukey post-hoc performed; significant differences are indicated with lowercase letters in each row and uppercase letters in each column. Materials were significantly less translucent and allowed less curing light irradiance as they increased in thickness. There was a strong correlation between the translucency and light irradiance of different materials at each thickness (r=.893)
Conclusions: When curing composite through clear PVS materials, light irradiance is influenced by the PVS thickness and brand and correlated with its translucency.
Methods: Specimens (n=5) of 4 clear PVS materials (see tables) were dispensed into Teflon molds (diameter=12mm) of 5 different thicknesses (2mm, 4mm, 6mm, 8mm, 10mm). Specimens were placed against calibrated white and black backgrounds and L*a*b* values were taken using a spectrophotometer (CM-700d; Konica Minolta). The translucency parameter was measured as the difference in color using ΔE00. For light irradiance, each PVS specimen was placed onto a spectrophotometer‘s sensor (MARC Light Collector, BlueLight Analytics) to measure irradiance transmitted through the specimens from a light curing unit (Valo Cord, Ultradent, irradiance=1100mW/cm2). All specimens were light-exposed in the Standard mode for 5s (V100045, Valo Corded, Ultradent). The irradiance (mW/cm2) was calculated by dividing the power (mW) by the 10mm diameter of the integrating sphere aperture (A=0.785cm2). Translucency and light irradiance were analyzed separately through two-way ANOVA (factors: brand and thickness) and Tukey post-hoc run where appropriate. Correlation between translucency and light irradiance of materials for each thickness was evaluated with Pearsons coefficient using SPSS.
Results: The mean ± standard deviation of the translucency and light irradiance are presented (see tables). Two-way ANOVA was significant for both factors and their interaction (p<.01), so individual one-way ANOVA and Tukey post-hoc performed; significant differences are indicated with lowercase letters in each row and uppercase letters in each column. Materials were significantly less translucent and allowed less curing light irradiance as they increased in thickness. There was a strong correlation between the translucency and light irradiance of different materials at each thickness (r=.893)
Conclusions: When curing composite through clear PVS materials, light irradiance is influenced by the PVS thickness and brand and correlated with its translucency.