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Objectives : The purpose of this study was to evaluate the bleaching effec t of 3% hydrogen peroxide containing strip with primer in vivo.Methods : 22 female subjects aged from 20 to 39 years old were recruit ed after informed consent. They were divided into two groups with control and experimental group. Experimental group was bleached with 3% HP strip with primer, and control group r eceived placebo for 14 days. Color changes were measured with Shade Eye-NCC (Shade Eye-NCC, SHOFU Co., Japan), Shade guide (VITA classical shade guide, VIDENT TM , CA, USA) and digital camera image. All collected data were analyzed using SPSS 18.0. Corresponding Author Keun-Bae SongDepartment of Preventive DentistrySchool of DentistryKyungpook National University2177 Dalgubeol-daero, Jung-guDaegu 700-412, KoreaTel : +82-53-660-6870 +82-10-2762-2502Fax : +82-53-423-2947E-mail : kbsong@knu.ac.krResults : At baseline, L* was 71.75±3.2 and b* was 14.90±3.6 in contro l, and L* was 71.3±3.4 and b* was 15.61±3.7 in experimental group. At day 14, L* was 71.35±3.2 and b* was 13.97±4.3 in control, and L* was 73.51±2.0, b* was 9.10±3.0 in experimen tal group. ∆E* of all teeth were statistically significant between the two groups. Final ∆E* was 7.15±2.09 at experimental group and 2.78±2.93 at control group, and the difference was si gnificant (p<0.005). Color changes using shade guide also significantly decreased at 14th day comp ared with baseline at experimental group (p<0.005).Conclusions : 3% hydrogen peroxide strip with primer revealed effective enough to bleaching the human enamel during 14 days without any soft and hard tissu e irritations. Key Words : bleaching, hydrogen peroxide, primer, strip : , , ,

Clinical evaluation of bleaching effect of 3% hydrogen peroxide strip with primer on human enamel