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Effects of different clinical protocols in tooth bleaching efficacy, tooth colour assessment and oral health-related quality of life
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Objectives: To compare efficacy, long-term stability, and impact on oral health related quality of life of different tooth bleaching techniques and clinical protocols while evaluating different tooth colour assessment methods and their colour perception. Materials and methods: Three clinical studies were individually designed. The first evaluated the effect of dental prophylaxis on tooth colour perception and the visual assessment’s reliability when compared to spectrophotometry. In the second the application of an in-office paint-on varnish with different soft-tissues protecting materials and its bleaching efficacy was evaluated. The last study evaluated tooth colour/whiteness and OHIP-14-PT scores at different stages with three different bleaching systems. CIELAB formulas were used to quantify colour space differences (ΔE00/ΔWID) and were applied in all studies while considering its respective perceptibility/acceptability thresholds. For statistical analyses was set a 5% significance level. Results: Tooth colour differences higher than the perceptibility threshold were systematically detected post-prophylaxis by both visual and spectrophotometric methods. An in-office paint-on varnish presented significantly higher (P0.05). Conclusions: The influence of dental prophylaxis in tooth colour perception and of different soft-tissues protecting materials in in-office bleaching efficacy were determined for the first time. The proposed modification for an in-office paint-on varnish technique attained both bleaching efficacy and oral health-related quality of life improvement while presenting a lesser application time when compared with equal concentration systems.
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Branqueamento dentário qualidade de vida cor estética espectrofotometria Tooth bleaching quality of life colour aesthetics spectrophotometry