Effect of copaiba oil-resin on dental sensitivity control and color change after bleaching: A randomized clinical trial.

Abstract

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.