Costacurta Adriana-Osten, Borges Carolina-Elisa-Pereira, Centenaro Camila, Correr Gisele-Maria, Kaizer Marina-da Rosa, Gonzaga Carla-Castiglia
DDS, MS. Graduate Student, School of Health Sciences, Graduate Program in Dentistry, Universidade Positivo, Curitiba, PR, Brazil.
Undergraduate Student, School of Health Sciences, Graduate Program in Dentistry, Universidade Positivo, Curitiba, PR, Brazil.
J Clin Exp Dent. 2020 Jul 1;12(7):e644-e649. doi: 10.4317/jced.56917. eCollection 2020 Jul.
To evaluate the bleaching efficacy of at-home carbamide peroxide (CP) gels in two concentrations, containing or not a desensitizing agent.
Forty incisors were divided into four groups (n=10), according to gel concentrations (10% or 22%), and presence or not of 3% potassium nitrate in the gel. A thin layer of gel was applied to the buccal surface of each tooth for 2h/day for 4 weeks. Bleaching efficacy was measured using a spectrophotometer, and ∆E*ab, ∆E00 and ∆WID were calculated. Measurements were performed at baseline, 7, 14, 21, 28, and 35 days following the first gel application. Data were analyzed by two-way RM-ANOVA and Tukey's test (α=0.05).
Regarding gel concentration or potassium nitrate inclusion, both gels resulted in color change above the perceptibility thresholds, which were similar between gels. Regarding time, significant differences were observed between color change values at 7 days and other time periods. ∆WID ranged from 3.8 to 9.6. Significant moderate to strong positive correlation was observed among the parameters.
Nor the CP concentration, neither the inclusion of potassium nitrate in the gel, had influence on bleaching efficacy. All gels were effective and showed good results from the first weeks' application. Tooth bleaching, carbamide peroxide, desensitizer, potassium nitrate, color.
评估两种浓度的含或不含脱敏剂的家用过氧化脲（CP）凝胶的漂白效果。
根据凝胶浓度（10%或22%）以及凝胶中是否含有3%硝酸钾，将40颗切牙分为四组（n = 10）。在每颗牙齿的颊面涂抹一层薄薄的凝胶，每天2小时，持续4周。使用分光光度计测量漂白效果，并计算∆E*ab、∆E00和∆WID。在首次涂抹凝胶后的基线、第7、14、21、28和35天进行测量。数据采用双向重复测量方差分析和Tukey检验（α = 0.05）进行分析。
关于凝胶浓度或硝酸钾的添加，两种凝胶均导致颜色变化超过可感知阈值，且两种凝胶之间相似。关于时间，在第7天和其他时间段的颜色变化值之间观察到显著差异。∆WID范围为3.8至9.6。各参数之间观察到显著的中度至强正相关。
CP浓度和凝胶中硝酸钾的添加均对漂白效果无影响。所有凝胶均有效，且从最初几周的应用就显示出良好效果。牙齿漂白、过氧化脲、脱敏剂、硝酸钾、颜色。
