Aim. The aim of the research is to evaluate, with spectrophotometer technique, the effectiveness of tooth bleaching performed with 35% hydrogen peroxide and 10% carbamide peroxide laser activated Materials and methods. 17 patients were treated with tooth bleaching composed by 35% hydrogen peroxide and 10% carbamide peroxide (Opalescence® boost, Ultradent). All patients were subjected to the same combination of bleaching agents but only in 10 of these, laser (G 8 diode laser, Galbiati) was used. Teeth colours were evaluated before and immediately after the treatment, and, one day and one week after, during the follow-up. During every treatment session and follow-up session the colour was studied both with a chromatic scale (Vita Lumin™) and an electronic analyzer of tooth-colour (Spectro shade™). The spectrophotometer was usefull for an objective evaluation of L-lightness (brightness or value), C-chroma (saturation or chroma), H-hue (hue, or tint) and the comparison of the colorimetric data obtained with the chromatic scale used. Three measurements were made for each tooth to standardize the readings and to prevent changes in instrument reading. Then the average was calculated by converting the alphanumeric codes of the colors in numbers, according to the conversion table proposed by Brenna. The difference in Colour ΔE =√ΔL*2 + ΔC*2 + ΔH*2 was calculated. We considered that for ΔE > 3 the differences are significant and are easily distinguished by the untrained eye. For 2 <ΔE< 3 differences exist but are not well visible. For ΔE <2, the human eye is unable to make any distinction Results. The data analysis results shows that the changes of hue, lightness and chroma are significantly influenced by the interaction between the bleaching agent and the early teeth colour. The photoactivation has significantly improved the effectiveness of the bleaching agent. All patients treated with laser complained about an increase of teeth sensitivity. This clinical finding can be linked to an increased internal temperature of the pulp chamber compatible with the state of pulp health. Conclusions. The results of this study indicate a statistically effectiveness of the use of photo-activating

Spectrophotometer technique evaluation in tooth bleaching with laser application

AMATO, Massimo;G. Pantaleo;
2014

Abstract

Aim. The aim of the research is to evaluate, with spectrophotometer technique, the effectiveness of tooth bleaching performed with 35% hydrogen peroxide and 10% carbamide peroxide laser activated Materials and methods. 17 patients were treated with tooth bleaching composed by 35% hydrogen peroxide and 10% carbamide peroxide (Opalescence® boost, Ultradent). All patients were subjected to the same combination of bleaching agents but only in 10 of these, laser (G 8 diode laser, Galbiati) was used. Teeth colours were evaluated before and immediately after the treatment, and, one day and one week after, during the follow-up. During every treatment session and follow-up session the colour was studied both with a chromatic scale (Vita Lumin™) and an electronic analyzer of tooth-colour (Spectro shade™). The spectrophotometer was usefull for an objective evaluation of L-lightness (brightness or value), C-chroma (saturation or chroma), H-hue (hue, or tint) and the comparison of the colorimetric data obtained with the chromatic scale used. Three measurements were made for each tooth to standardize the readings and to prevent changes in instrument reading. Then the average was calculated by converting the alphanumeric codes of the colors in numbers, according to the conversion table proposed by Brenna. The difference in Colour ΔE =√ΔL*2 + ΔC*2 + ΔH*2 was calculated. We considered that for ΔE > 3 the differences are significant and are easily distinguished by the untrained eye. For 2 <ΔE< 3 differences exist but are not well visible. For ΔE <2, the human eye is unable to make any distinction Results. The data analysis results shows that the changes of hue, lightness and chroma are significantly influenced by the interaction between the bleaching agent and the early teeth colour. The photoactivation has significantly improved the effectiveness of the bleaching agent. All patients treated with laser complained about an increase of teeth sensitivity. This clinical finding can be linked to an increased internal temperature of the pulp chamber compatible with the state of pulp health. Conclusions. The results of this study indicate a statistically effectiveness of the use of photo-activating
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4508457
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