J Appl Oral Sci:剩余冠厚度和高度对牙髓治疗牙齿的生物力学行为的影响

2020-03-04 不详 网络

本研究旨在评估修复策略(纤维柱与铸造柱和核),冠状高度(0 mm vs 2 mm)和壁厚(大于1 mm vs小于1 mm)对存留率,抗断裂性和应力分布的影响。清洁72头牛牙齿并将其分为6组(n = 12)。将24颗牙齿切成13毫米长(无残冠),将48颗牙齿切成15毫米(残留2毫米冠部结构)。在48颗中,一半的剩余冠状体厚度小于1毫米,另一半的厚度大于1毫米。所有的根管均预备到10毫米(纵切长度)处

本研究旨在评估修复策略(纤维柱与铸造柱和核),冠状高度(0 mm vs 2 mm)和壁厚(大于1 mm vs小于1 mm)对存留率,抗断裂性和应力分布的影响。

清洁72头牛牙齿并将其分为6组(n = 12)。将24颗牙齿切成13毫米长(无残冠),将48颗牙齿切成15毫米(残留2毫米冠部结构)。在48颗中,一半的剩余冠状体厚度小于1毫米,另一半的厚度大于1毫米。所有的根管均预备到10毫米(纵切长度)处,纤维桩固结在36个标本中,铸造桩及核在其他36个标本中。所有牙齿均用金属冠修复。样品进行了150万次循环(切缘下方2 mm处100 N,45°,10 Hz),并在每500,000次循环中进行评估以检测损坏。将幸存的标本加载至断裂测试。将二维(Rhinoceros®4.0)模型的生存数据提交给Kaplan-Meier分析(α= 0.05),将骨折负荷数据提交给ANOVA和Tukey测试(α= 0.05)。

结果显示,无冠结构组的生存率低于其他组(p = 0.001)。方差分析显示,对于冠状厚度大于1 mm的组,其断裂载荷值较高(p = 0.0043)。有限元分析显示,有剩余冠状结构的组中,应力分布更好,并通过纤维桩恢复。

总之,该研究结果表明,没有残留冠状结构的标本存活率较低。剩余结构小于1 mm且没有冠状结构的标本,与修复策略无关,支持相同的断裂值载荷。

原始出处:

Gislene Corrêa,  Lucas P Brondani, et al., Influence of remaining coronal thickness and height on biomechanical behavior of endodontically treated teeth: survival rates, load to fracture and finite element analysis. J Appl Oral Sci. 2018; 26: e20170313.  doi: 10.1590/1678-7757-2017-0313

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    2020-12-04 jxrzshh
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    2020-03-31 小几洁
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    2020-03-06 zhouqu_8
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