J Endod:下颌磨牙近中中根管的预备增加近中根折裂的风险

2020-07-02 lishiting MedSci原创

这篇研究的目的是为了评估下颌磨牙近中中根管(MM)的发生率和预备对近中根抗折裂的影响。

这篇研究的目的是为了评估下颌磨牙近中中根管(MM)的发生率和预备对近中根抗折裂的影响。

研究通过术前micro-CT扫描选取了40颗完整的下颌第一磨牙,其近中根具有2 (n=20)或3 (n=20)个独立的根管,其分叉处距离根尖至少5 mm。被选牙根随后按照以下条件分为2个实验组(n=10)和2个对照组(n=10):根长、根管结构2 or 3 independent canals)和分叉处的根厚度。在实验1 (2 independent canals)和3 (3 independent canals)组,根管预备至ProTaper Next X3,而2 (2 independent canals)和4 (3 independent canals)组根管未预备。样本表面镀一薄层硅酮后将其埋入丙烯酸树脂内,随后通过通用测试仪进行折裂强度测试。记录折裂范围和折裂线的类型,并通过Chi-square检验进行统计学评估,通过one-way ANOVA和post hoc Tukey检验分析其折裂强度(α=5%)。

结果显示,在含2 (Group 2; 696.1 ± 186.3 N)或3 (Group 4; 558.4±154.6 N)个独立根管的未预备组的折裂强度之间未见显著性差异(P>.05),而含MM根管的预备组中的折裂强度最低(Groups 3; 377.1±77.2 N)。含2根管的预备组的平均折裂强度(Group 1; 528.4±134.3 N)与含3根管的未预备组(Group 4; 558.4±154.6 N)之间无明显差异(P>.05)。Chi-square检验结果显示,各组的折裂范围、类型和折裂线之间无显著性差异(P>.05)。所有组的折断范围几乎均在中间或颊侧中间,而折裂线的最常见形态为弯曲或锯齿形。

结论:下颌磨牙近中根的折裂强度在近中根管使用大锥度器械预备后减弱。MM根管的预备会进一步削弱近中根的折裂强度。这种折裂的结果展现出颊舌向平面具有一种独特的模式。

原始出处

Ali Keleş, Cangül Keskin, et al. Middle Mesial Canal Preparation Enhances the Risk of Fracture in Mesial Root of Mandibular Molars. J Endod., 2020 Jun 13;S0099-2399(20)30382-4. doi: 10.1016/j.joen.2020.05.019.

 

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    2020-07-04 kksonne
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