IADR Abstract Archives
Effects of Co-Solvents & LED on Dithionite Bleaching Agent
Objectives: The aim of the study is to evaluate the efficacy of a novel non-peroxide-based whitening strip combined with the effects of co-solvents & infrared LED.
Methods: Forty bovine teeth were exposed for standardized staining with doxycycline. The teeth were sectioned horizontally to expose the pulp chamber, then filled with 1.0 mL saturated doxycycline solution. The root chamber was then resealed and teeth centrifuged. Staining was accomplished by continuous exposure to 9W natural white 800 lumen light for 8 weeks. The stained samples were then randomly divided into 4 treatment (30 min) groups using Dithionite White (DW) as the bleaching agent. Two mouthwashes were used as pre-treatment co-solvents.
DW with Plax 30 ml for 30 s
DW with CariFree 30 ml for 60 s
DW with CariFree 30 ml for 60 s + infrared LED
DW with Plax 30 ml for 30 s + infrared LED
Color assessment was completed with a spectrophotometer (CR200, Konica, Minolta) at baseline pretreatment, post-stain, 7, 14, 21, 28 and 56-days bleaching treatment. Images of the facial surfaces were recorded with a digital camera. L*, a*, b* at each period of bleaching were compared to baseline. The color difference (ΔE) was calculated by the equation: ΔE = [(ΔL)2 + (Δa)2 + (Δb)2] ½ . The mean ΔE were analysed with two-way ANOVA (α=0.05).
Results: All treatment protocols showed significant visual color improvement (ΔE increased) after bleaching for 7 days compared to immediate post staining. The ΔE readings (Figure 1) correlated well with photographic evidence (Figure2). There is no statistical difference among the four treatment groups (F=2.12; α=0.115). Time factor showed signifance difference at 56-days for group 3 (α<0.05).
Conclusions: Dithionite non-peroxide-based system is effective to bleach standardized doxycycline stain teeth. Infrared LED and mouth rinse with alkaline pH showed enhanced bleaching results but did not show any overall statistical difference except at the 56-days treatment. Further investigations as to mechanisms and LED parameters are needed.
Methods: Forty bovine teeth were exposed for standardized staining with doxycycline. The teeth were sectioned horizontally to expose the pulp chamber, then filled with 1.0 mL saturated doxycycline solution. The root chamber was then resealed and teeth centrifuged. Staining was accomplished by continuous exposure to 9W natural white 800 lumen light for 8 weeks. The stained samples were then randomly divided into 4 treatment (30 min) groups using Dithionite White (DW) as the bleaching agent. Two mouthwashes were used as pre-treatment co-solvents.
DW with Plax 30 ml for 30 s
DW with CariFree 30 ml for 60 s
DW with CariFree 30 ml for 60 s + infrared LED
DW with Plax 30 ml for 30 s + infrared LED
Color assessment was completed with a spectrophotometer (CR200, Konica, Minolta) at baseline pretreatment, post-stain, 7, 14, 21, 28 and 56-days bleaching treatment. Images of the facial surfaces were recorded with a digital camera. L*, a*, b* at each period of bleaching were compared to baseline. The color difference (ΔE) was calculated by the equation: ΔE = [(ΔL)2 + (Δa)2 + (Δb)2] ½ . The mean ΔE were analysed with two-way ANOVA (α=0.05).
Results: All treatment protocols showed significant visual color improvement (ΔE increased) after bleaching for 7 days compared to immediate post staining. The ΔE readings (Figure 1) correlated well with photographic evidence (Figure2). There is no statistical difference among the four treatment groups (F=2.12; α=0.115). Time factor showed signifance difference at 56-days for group 3 (α<0.05).
Conclusions: Dithionite non-peroxide-based system is effective to bleach standardized doxycycline stain teeth. Infrared LED and mouth rinse with alkaline pH showed enhanced bleaching results but did not show any overall statistical difference except at the 56-days treatment. Further investigations as to mechanisms and LED parameters are needed.
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