TY - JOUR AU - Piknjač, Amar AU - Zlatarić, Dubravka Knezović PY - 2021/11/15 Y2 - 2024/03/28 TI - Clinical Evaluation of 6-Month Efficacy of 40% in-Office Whitening Treatment JF - Pesquisa Brasileira em Odontopediatria e Clínica Integrada JA - Pesqui Bras Odontopediatria Clin Integr VL - 21 IS - SE - DO - UR - https://revista.uepb.edu.br/PBOCI/article/view/718 SP - e0236 AB - <p><strong>Objective: </strong>To assess the 6-month efficacy of natural tooth color change in in-office bleaching treatment in terms of time by using a spectrophotometer. <strong>Material and Methods:</strong> A total of 20 participants were chairside treated with 40% hydrogen peroxide (HP), three applications each 20 minutes, in one appointment. Instrumental color measurement was performed on six anterior maxillary teeth before bleaching (baseline—t<sub>0</sub>), immediately after in-office bleaching and rehydration of the teeth (t<sub>1</sub>), 3 months (t<sub>2</sub>), and 6 months after bleaching treatment (t<sub>3</sub>). The spectrophotometer measured the tooth shades based on the CIE L*a*b* color notation system and Bleach index during the period of observation. CIE L*a*b* (ΔE<sub>ab</sub>) color differences were calculated. <strong>Results:</strong> The color change at t<sub>1</sub> was ΔE<sub>ab</sub> = 3.2, at t<sub>2</sub> was ΔE<sub>ab</sub> = 1.8, at t<sub>3</sub> was ΔE<sub>ab</sub> = 1.2 and overall color change of in-office method was ΔE<sub>ab</sub> = 3.6 (p&lt;0.05). A significant effect for the mean CIEL*a*b* values was detected as within time b* values decreased significantly (p&lt;0.05). Bleach index values significantly decreased during the time of observation, too (p&lt;0.05). <strong>Conclusion:</strong> The in-office bleaching treatment using 40% hydrogen peroxide was effective, and the results showed a statistically significant decrease in color change during the period of 6-month observation.</p> ER -