Clinical evaluation of two dental bleaching techniques

Abstract

Objective To clinically evaluate the bleaching effect, tooth sensitivity and rebound effect (3⁃month fol⁃ low⁃up) of combined bleaching technique and deep bleaching technique. Methods 30 Patients were recruited accord⁃ ing to inclusion and exclusion criteria. Both two dental bleaching techniques, included in⁃office bleaching followed by at⁃ home bleaching, and at⁃home bleaching followed by in⁃office bleaching and at⁃home bleaching, which were called com⁃ bined bleaching technique and deep bleaching technique, respectively, were performed in the same mouth in each sub⁃ ject. All subjects received at⁃home bleaching with 6% hydrogen peroxide (HP) for 1 h/d within 7 days on one side of the dental arch (15 on the left side and the other on the right side), and followed by three 8⁃minute in⁃office bleaching treat⁃ ments in succession with 35% HP on the maxillary anterior teeth, and finally with identical at⁃home bleaching on the maxillary anterior teeth. Tooth color was objectively evaluated using Olympus Crystaleye Spectrophotometer at the base⁃ line appointment, and 1st , 7th , 30th and 90th day after treatment. The soft tissues and sensitivity of gingival and hard tooth tissues were evaluated using Loe and Silness Gingival Index and Visual Analog Scale (VAS) at baseline, 1st and 7th day after treatment. Results Significantly less prominent color change and tooth sensitivity were observed in teeth received combined bleaching technique, compared with those received deep bleaching technique (P 0.05). Conclusions Both combined bleaching technique and deep bleaching technique show satisfactory effects and the same rebound effect during the same periods of follow ⁃up. Deep bleaching technique is a more effective method of bleaching, however, with high fre⁃ quency of tooth sensitivity.

Keywords

• Tooth bleaching
• Combined bleaching technique
• Deep bleaching technique
• Tooth color rebound
• Tooth sensitivity