A clinical study assessing the short-term efficacy of combined in-office/at-home whitening treatment

Abstract

Objective: The purpose of this randomized clinical trial was to assess the efficacy of color change in combined in-office/at-home whitening.

Materials and methods: Thirty participants were randomly divided into two groups: 15 received combined treatment in-office whitening (6% hydrogen peroxide + 2 weeks at-home whitening with 16% carbamide peroxide [CP]); 15 were assigned to control group. Instrumental color measurements were obtained before whitening (t₀ ), immediately after in-office whitening (t_in-office ), after 1 week of active treatments (t₁ ), and at the completion of the whitening treatment (t₂ ). CIE L*a*b* values were recorded and CIE L*a*b* and CIEDE2000 color differences were calculated.

Results: The color change at t_in-office was ΔE_ab = 4.7 and ΔE₀₀ = 3.2 and overall color change of combined method at t₂ was ΔE_ab = 8.2 and ΔE₀₀ = 5.3 (P < 0.05). A statistically significant effect for the mean CIE L*a*b* and CIEDE2000 values was detected within time with the mean a*, b* and C' values decreasing and mean h' values increasing significantly (P < 0.05).

Conclusions: Combined in-office/at-home whitening was effective. Whitening efficacy increased upon application of 16% CP in combined in-office/at-home treatment (P < 0.05).

Clinical significance: The statistically significant increase in color change recommends clinical application of combined in-office/at-home whitening treatment.

Keywords: at-home whitening; in-office whitening.