Patusco Virna Cavalcante, Montenegro Gil, Lenza Marcos Augusto, Alves de Carvalho Adilson
Department of Orthodontics, Federal University of Goiania, Goiania, Brazil.
Angle Orthod. 2009 Jan;79(1):122-6. doi: 10.2319/072507-345.1.
To test the hypothesis that there is no difference between the action of at-home and in-office vital bleaching on the shear bond strength of metallic brackets bonded with composite resin 24 hours after bleaching.
Forty-five human upper premolars were randomly divided into three groups: (1) control, (2) 10% carbamide peroxide at-home bleached, and (3) 35% hydrogen peroxide in-office bleached. Twenty-four hours after bleaching the teeth were pumiced, bonded with metallic brackets, and stored in distilled water. One day after bonding the shear bond strength of the brackets was determined.
The mean shear bond strength of Group 1 (control) and Group 2 (carbamide peroxide bleached) were not statistically different. Group 3 (hydrogen peroxide bleached) had a significantly lower mean shear bond strength than Group 1 and Group 2.
The hypothesis is rejected. Use of 10% carbamide peroxide bleaching does not significantly alter shear bond strength values. On the other hand, use of 35% hydrogen peroxide bleaching significantly reduces these values and diminishes the amount of resin remnant on the tooth surface after bracket debonding.
验证在家进行的牙齿美白和诊室进行的牙齿美白对复合树脂粘结金属托槽24小时后的剪切粘结强度无差异这一假设。
45颗人上颌前磨牙随机分为三组：（1）对照组，（2）10%过氧化脲在家美白组，（3）35%过氧化氢诊室美白组。牙齿美白24小时后进行打磨、粘结金属托槽，并储存在蒸馏水中。粘结一天后测定托槽的剪切粘结强度。
第1组（对照组）和第2组（过氧化脲美白组）的平均剪切粘结强度无统计学差异。第3组（过氧化氢美白组）的平均剪切粘结强度显著低于第1组和第2组。
该假设被拒绝。使用10%过氧化脲美白不会显著改变剪切粘结强度值。另一方面，使用35%过氧化氢美白会显著降低这些值，并减少托槽脱粘后牙齿表面的树脂残留量。
