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首页> 美国卫生研究院文献>The Journal of the Indian Prosthodontic Society >An In Vitro Study to Compare the Effect of Two Etching Techniques on the Tensile Bond Strength of Resin Cement Bonded to Base Metal Alloy and Enamel
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An In Vitro Study to Compare the Effect of Two Etching Techniques on the Tensile Bond Strength of Resin Cement Bonded to Base Metal Alloy and Enamel

机译：一种体外研究比较两种蚀刻技术对粘结在贱金属合金和搪瓷上的树脂水泥的拉伸粘结强度的影响

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Resin-bonded retainers are being preferred for anterior restorations. To increase the retentive strength of the metal fixed to the tooth, the retainer surface has to be etched. Different etching techniques are described in the literature with different researchers expressing the superiority of one technique over the other. This study was conducted to compare electro chemical and chemical etching techniques and the mode of bond failure. Twenty human maxillary premolars with the crown portion separated from root were embedded in resin block such that mesial or distal portion of it was exposed on the top of the block. 4 × 5 mm area was marked on the tooth, and wax pattern was prepared to cover the exact area, with the opposite end having a hook like structure which was later attached to universal testing machine. Wiron99 Ni–Cr alloy was used for casting. Once the casting and etching procedures were finished, wax patterns were invested, casted and half the samples were etched chemically using Aqua-regia and the other half samples were etched electrochemically. The castings were cleaned and cemented to tooth structure using Rely-X ARC (3 M ESPE, USA) resin cement. Specimens were fixed to universal testing machine and de-bonded. The load required to de-bond and mode of de-bonding was noted. Results were subjected to five different statistical tests, each test specific to the variable being tested. The mean failure load was calculated as 5.95 kg for electrochemically etched samples and that of chemically etched samples was calculated as 11.15 kg. The standard deviation of the force required to debond the specimens (Kgf) was calculated and found to be 0.65 for electrochemically etched samples and 1.11 for chemically etched samples. The following conclusions have been drawn from the study. 1. Chemical etching of the samples created better retentive surfaces than electrochemical etching. 2. The results of mode of de-bonding show that in case of chemical etching maximum debonding occurred at resin-enamel interface and in electrochemical type it occurred at resin-metal interface.
机译：树脂粘结的固定器是前牙修复的首选。为了增加固定在牙齿上的金属的保持力，必须对保持器表面进行蚀刻。文献中描述了不同的蚀刻技术，不同的研究人员表达了一种技术相对于另一种技术的优越性。进行该研究以比较电化学和化学蚀刻技术以及键合失败的模式。将二十个人的上颌前磨牙的冠部与根部分开，将其嵌入树脂块中，使其中部或远侧部分暴露在该块的顶部。在牙齿上标记出4×5毫米的区域，并准备蜡纹覆盖确切的区域，其另一端具有钩状结构，随后被连接到通用测试机上。 Wiron99 Ni-Cr合金用于铸造。浇铸和蚀刻程序完成后，投入蜡模，进行浇铸，然后使用Aqua-regia对一半样品进行化学蚀刻，而另一半样品进行电化学蚀刻。使用Rely-X ARC（美国3 M ESPE）树脂水泥清洁铸件并将其粘结到牙齿结构上。标本固定在通用测试机上并脱胶。记录了剥离所需的载荷和剥离的方式。对结果进行五种不同的统计检验，每种检验都特定于要测试的变量。电化学蚀刻样品的平均失效载荷为5.95 kg，化学蚀刻样品的平均失效载荷为11.15 kg。计算出使样品脱粘所需的力的标准偏差（Kgf），对于电化学蚀刻的样品为0.65，对于化学蚀刻的样品为1.11。这项研究得出以下结论。 1.与电化学蚀刻相比，化学蚀刻样品可产生更好的保持性表面。 2.脱粘模式的结果表明，在化学蚀刻的情况下，最大的脱粘发生在树脂-搪瓷界面，而在电化学类型中，最大的脱粘发生在树脂-金属界面。

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