dos Santos Medeiros Maria Cristina, de Lima Kenio Costa
Department of Dentistry, Universidade Federal do Rio Grande do Norte, Natal, Brazil.
J Can Dent Assoc. 2008 Mar;74(2):163-163e.
To use the criteria set by the American Dental Association to evaluate the effectiveness of nightguard vital bleaching with 10% carbamide peroxide through a controlled randomized clinical trial.
Fifty volunteers allocated to either an experimental group(Opalescence PF 10%; OPA) or a control group (placebo; PLA) used a gel for 21 days. Observations of tooth colour were recorded at baseline, immediately after 3 weeks of use(day 21), and 30 days (day 30) and 6 months (day 180) after the treatment was finished. Colour was evaluated with the Vitapan classical shade guide and from the volunteers' degree of satisfaction. Tooth sensitivity and gingival bleeding were also assessed.
The median increase in the lightness of the teeth in the OPA group was 3 units,based on the value-ordered Vitapan shade guide. This improvement in lightness was maintained for 6 months in 88% of this group. In the PLA group, 8% had a 2-unit reduction in tooth colour at day 21. Tooth sensitivity occurred in the OPA (36%) and PLA (8%)groups. Gingival bleeding was not associated with gel use. Volunteers' satisfaction was 92% for the OPA and 8% for the PLA group.
With the protocol used, nightguard vital bleaching was an effective technique that had minimal and transient side effects that disappeared after treatment without causing sequelae or complications.
通过一项对照随机临床试验，使用美国牙科协会设定的标准来评估含10%过氧化脲的夜间护齿冷光美白的效果。
50名志愿者被分为实验组（Opalescence PF 10%；OPA）或对照组（安慰剂；PLA），使用凝胶21天。在基线、使用3周后（第21天）、治疗结束后30天（第30天）和6个月（第180天）记录牙齿颜色观察结果。使用维他经典比色板评估颜色，并根据志愿者的满意度进行评估。还评估了牙齿敏感性和牙龈出血情况。
根据有序排列的维他比色板，OPA组牙齿明度的中位数增加了3个单位。该组88%的人这种明度改善持续了6个月。在PLA组，8%的人在第21天时牙齿颜色降低了2个单位。牙齿敏感在OPA组（36%）和PLA组（8%）出现。牙龈出血与凝胶使用无关。OPA组志愿者的满意度为92%，PLA组为8%。
采用该方案，夜间护齿冷光美白是一种有效的技术，副作用最小且短暂，治疗后消失，未引起后遗症或并发症。
