Murchison D F, Charlton D G, Moore B K
USAF Medical Center, Keesler AFB, MS 39534.
Oper Dent. 1992 Sep-Oct;17(5):181-5.
Three 10% carbamide peroxide home bleaching agents were evaluated to determine their effects on tensile bond strength of resin to enamel and enamel surface hardness. Eighty extracted bicuspid crowns were divided into four groups (three bleaching agents and control), and treated with the bleaching agents for five consecutive days. A bonding site on the buccal surface of each crown was etched with phosphoric acid and an orthodontic bracket bonded in place. The specimens were thermocycled and loaded to failure in an Instron Universal Testing Machine. Five hardness specimens per group were measured prebleaching and after five days' exposure. Analysis by one-way ANOVA indicated no significant differences in bond strength between the four groups (P > 0.05). There were also no differences in pre- or postbleaching Knoop hardness values for the four groups (P > 0.05). This study indicated that in short-term regimens 10% carbamide peroxide does not significantly affect enamel surface hardness or bonding ability.
对三种10%的过氧化脲家庭漂白剂进行了评估，以确定它们对树脂与牙釉质的拉伸粘结强度以及牙釉质表面硬度的影响。80颗拔除的双尖牙冠被分为四组（三种漂白剂组和对照组），并连续五天用漂白剂进行处理。每颗牙冠颊面的一个粘结部位用磷酸蚀刻，然后将正畸托槽粘结到位。对标本进行热循环处理，并在英斯特朗万能试验机上加载直至破坏。每组在漂白前和暴露五天后测量五个硬度标本。单向方差分析表明，四组之间的粘结强度没有显著差异（P>0.05）。四组在漂白前或漂白后的努氏硬度值也没有差异（P>0.05）。这项研究表明，在短期方案中，10%的过氧化脲不会显著影响牙釉质表面硬度或粘结能力。
