Universidade Federal de Goiás, Faculdade de Odontologia, Departamento de Ciências Estomatológicas, Goiânia, Goiás, Brazil.
Universidade Luterana do Brasil, Faculdade de Odontologia, Departamento de Ciências Estomatológicas, Canoas, Rio Grande do Sul, Brazil.
J Appl Oral Sci. 2019;27:e20180442. doi: 10.1590/1678-7757-2018-0442. Epub 2019 Apr 11.
To assess pulp oxygen saturation levels (SaO2) in maxillary central incisors after dental bleaching.
80 participants (160 teeth) were randomly allocated to four groups: G1 In-office bleaching with two applications of 35% hydrogen peroxide (HP) (20 minutes), followed by at-home bleaching with 10% carbamide peroxide (CP) (2 hours/day for 16 days); G2 - Same protocol as G1, plus desensitizing toothpaste; G3 - In-office bleaching with 35% HP and one application of placebo gel (20 minutes), followed by at-home bleaching with 10% CP (2 hours/day for 16 days); and G4 - Same protocol as G3, plus desensitizing toothpaste. Pulp SaO2 levels were measured before (T0) and immediately after (T1) in-office bleaching; on the 5th (T2), 8th (T3), 12th (T4), and 16th days of at-home bleaching (T5); and on the 7th (T6) and 30th (T7) days. Mean (SD) pulp SaO2 levels were compared within groups by generalized estimating equations (GEE) and Student's t-test (P<0.05).
Mean pulp SaO2 at T0 was 84.29% in G1, 84.38% in G2, 84.79% in G3, and 85.83% in G4. At T1, these values decreased to 81.96%, 82.06%, 82.19%, and 81.15% in G1, G2, G3, and G4 respectively, with significant difference in G4 (P<0.05). During home bleaching, pulp SaO2 levels varied in all groups, with 86.55%, 86.60%, 85.71%, and 87.15% means at T7 for G1, G2, G3, and G4, respectively; G2 presented significant difference (P<0.05).
Pulp SaO2 level in maxillary central incisors was similar at baseline, reducing immediately after in-office bleaching, regardless of using desensitizing toothpaste and increasing at 30 days after dental bleaching.
评估牙齿漂白后上颌中切牙髓氧饱和度（SaO2）水平。
80 名参与者（160 颗牙齿）被随机分为四组：G1 诊室漂白，使用 35%过氧化氢（HP）两次（20 分钟），然后在家中使用 10%过氧脲（CP）漂白（每天 2 小时，共 16 天）；G2-与 G1 相同的方案，外加脱敏牙膏；G3-诊室漂白使用 35% HP 和一次安慰剂凝胶（20 分钟），然后在家中使用 10% CP 漂白（每天 2 小时，共 16 天）；G4-与 G3 相同的方案，外加脱敏牙膏。在诊室漂白前（T0）和立即后（T1）测量牙髓 SaO2 水平；在家庭漂白的第 5 天（T2）、第 8 天（T3）、第 12 天（T4）和第 16 天（T5）以及第 7 天（T6）和第 30 天（T7）。使用广义估计方程（GEE）和学生 t 检验（P<0.05）比较组内平均（SD）牙髓 SaO2 水平。
G1、G2、G3 和 G4 在 T0 时的平均牙髓 SaO2 分别为 84.29%、84.38%、84.79%和 85.83%。在 T1 时，这些值分别下降至 G1、G2、G3 和 G4 中的 81.96%、82.06%、82.19%和 81.15%，其中 G4 有显著差异（P<0.05）。在家庭漂白期间，所有组的牙髓 SaO2 水平均发生变化，G1、G2、G3 和 G4 在 T7 时的平均值分别为 86.55%、86.60%、85.71%和 87.15%；G2 有显著差异（P<0.05）。
上颌中切牙髓氧饱和度水平在基线时相似，诊室漂白后立即降低，无论是否使用脱敏牙膏，在牙齿漂白后 30 天都会增加。
