Melo Carolina França de Medeiros, Manfroi Fernanda Borguetti, Spohr Ana Maria
Researcher, Department of Restorative Dentistry, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Brazil.
PhD Student, Department of Restorative Dentistry, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Brazil.
J Int Oral Health. 2014 Jul;6(4):18-24.
This in situ study evaluated the roughness and microhardness of enamel bleached with 10% carbamide peroxide (PC10) and brushed with different toothpastes.
Two groups of volunteers received PC10 and placebo agents for 21 days in two phases in a crossover 2 × 3 study. Fragments of human enamel were distributed among intraoral removable appliances (IRA). Nine fragments, divided into three triplets, were used in each IRA, and these were brushed with toothpastes R (Colgate), W (Colgate Total 12 Whiteness Gel) or BS (Colgate Whitening Oxygen Bubbles Fluoride). Treatments agents were applied for 8 h overnight. After brushing, the volunteers used the IRA for about 16 h/day. After a washout period, new IRAs were distributed and the volunteers were crossed over to the alternate agent for 21 days. Roughness and microhardness were measured before and after each phase.
According to the paired Student's t-test, roughness of enamel increased and microhardness decreased (P < 0.05). According to analysis of variance generalized linear models, only the toothpaste factor was significant (P = 0.037) for roughness.
Enamel microhardness and surface roughness are altered when PC10 bleaching is associated with tooth brushing using toothpastes BS, R, and W.
本原位研究评估了用10%过氧化脲（PC10）漂白并用不同牙膏刷牙后的牙釉质粗糙度和显微硬度。
在一项交叉2×3研究中，两组志愿者分两个阶段接受PC10和安慰剂治疗21天。人牙釉质碎片分布于口腔内可摘矫治器（IRA）中。每个IRA中使用9个碎片，分为三个三联体，并用牙膏R（高露洁）、W（高露洁全效12美白凝胶）或BS（高露洁美白氧气泡泡含氟牙膏）刷牙。治疗剂在夜间使用8小时。刷牙后，志愿者每天使用IRA约16小时。经过洗脱期后，分发新的IRA，志愿者交叉使用替代剂21天。在每个阶段前后测量粗糙度和显微硬度。
根据配对t检验，牙釉质粗糙度增加，显微硬度降低（P<0.05）。根据方差分析广义线性模型，仅牙膏因素对粗糙度有显著影响（P = 0.037）。
当PC10漂白与使用牙膏BS、R和W刷牙相关时，牙釉质显微硬度和表面粗糙度会发生改变。
