Department of Preventive and Oral Rehabilitation, Goiânia, Goiás, Brazil.
Oper Dent. 2011 Sep-Oct;36(5):537-44. doi: 10.2341/10-062-L. Epub 2011 Aug 22.
When ozone is used during caries treatment, bond strength can be compromised by the release of oxygen. The use of antioxidant agents neutralizes the free oxygen. The aim of this study was to evaluate the effects of ozone and sodium ascorbate on resin-dentin microtensile bond strength (μTBS). Forty human third molars were divided into four groups: Group 1, not treated with ozone; Group 2, ozone application followed by acid etching; Group 3, acid etching followed by ozone application; and Group 4, ozone and application of sodium ascorbate. Bonded beams (1.0 mm(2)) were tested under tension (0.5 mm min(-1)). The μTBS values were analyzed using one-way analysis of variance (ANOVA) and the Tukey test (p=0.05). All beams that fractured were analyzed under stereomicroscopy (40×). Group 1 had significantly higher μTBS values than Group 2 or 3. The μTBS values of Groups 1 and 4 were similar and higher than those of Group 2. The use of ozone in Group 2 resulted in lower values of μTBS in all conditions evaluated. The predominant failure mode was adhesive. The application of ozone decreased the μTBS of the dentin-composite resin interface. These values were reversed when compared with Groups 1 and 2 when sodium ascorbate was used.
当臭氧用于龋齿治疗时，氧气的释放会影响粘结强度。抗氧化剂的使用可以中和游离氧。本研究旨在评估臭氧和抗坏血酸钠对树脂-牙本质微拉伸粘结强度（μTBS）的影响。将 40 个人类第三磨牙分为四组：第 1 组，不使用臭氧处理；第 2 组，臭氧处理后酸蚀；第 3 组，酸蚀后臭氧处理；第 4 组，臭氧和抗坏血酸钠处理。在张力下（0.5mm min(-1)）测试粘结梁（1.0mm(2)）。采用单因素方差分析（ANOVA）和 Tukey 检验（p=0.05）分析 μTBS 值。对所有断裂的粘结梁在立体显微镜下（40×）进行分析。第 1 组的 μTBS 值明显高于第 2 组或第 3 组。第 1 组和第 4 组的 μTBS 值相似且高于第 2 组。第 2 组中臭氧的使用导致所有评估条件下的 μTBS 值降低。主要的失效模式为粘结性失效。臭氧的应用降低了牙本质-复合树脂界面的 μTBS。与第 1 组和第 2 组相比，当使用抗坏血酸钠时，这些值会发生反转。
