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Effect of copaiba oil-resin on dental sensitivity control and color change after bleaching: A randomized clinical
Giovana Solheid Gil1, Gabriela Monteiro Barbosa Xavier2, Caio Augusto de Almeida Canelas3
1Federal University of Pará (Biomaterials Laboratory- LABIOMAT), Belém, (Pará), Brasil- Augusto Corrêa, 1 - Guamá, Belém, PA, 66075-110, Brazil. giovanasgil@yahoo.com.br.
Objective:
This randomized clinical trial evaluated a copaiba oil-based gel in controlling dental sensitivity (DS) and color change after dental bleaching.
Materials And Methods:
Seventy-five volunteers were randomized into three groups (n = 25): GC (placebo gel - negative control); GKF2% (gel of 5% potassium nitrate and 2% sodium fluoride - positive control); and GCO (copaiba oil gel). Three bleaching sessions were performed using 35% hydrogen peroxide (HP 35%), with 7-day intervals. The desensitizing gels were applied for 10 min in each group. The DS was evaluated over 21 days using a visual analog scale (VAS). Color evaluation was done with a spectrophotometer before and after bleaching using the CIEDE2000. The DS was assessed between groups (Kruskal-Wallis test) and within groups (Friedman test). The color change was analyzed using one-way ANOVA and Tukey's test.
Results:
GCO and GKF2% showed the lowest sensitivity values, with no significant difference (p < 0.05). In the intragroup analysis, GCO and GKF2% showed no differences across the three whitening sessions (p = 0.974, p = 0.213, p = 0.143, respectively). Conversely, GC exhibited an increase in DS after the last session (p = 0.035). All groups showed color change, without statistically significant differences between the groups (p = 0.725).
Conclusion:
The copaiba gel reduced dental sensitivity after treatment with 35% hydrogen peroxide, without affecting the bleaching effectiveness.
Clinical Relevance:
The topical application of the experimental copaiba oil gel was effective in reducing dental sensitivity after bleaching with 35% hydrogen peroxide.
