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Influence of single post, oval, and multi-post restorative techniques and amount of residual tooth substance on fracture strength of endodontically treated maxillary premolars
Journal of Oral Science ( IF 1.9 ) Pub Date : 2020-12-23 , DOI: 10.2334/josnusd.20-0338
Valentina Spicciarelli 1 , Crystal Marruganti 1 , Carla Di Matteo 1 , Marco Martignoni 1 , Hani Ounsi 1 , Tiziana Doldo 2 , Marco Ferrari 3 , Simone Grandini 1
Affiliation  

Purpose: The aim of this study was to compare the influence of the number of coronal walls and post-endodontic restorations on the mechanical strength of 165 recently extracted endodontically treated maxillary premolars.

Methods: The teeth were divided into 3 control (no post) and 3 test groups according to the number of residual walls. Each test group was divided into subgroups according to the type of post-endodontic restoration (single, oval, and multi-post techniques). Samples were prepared conforming to the assigned subgroup. A universal loading machine applied a load parallel to the longitudinal axis of the teeth, thus simulating physiological occlusion. ANOVA and the Kruskal Wallis test were used for comparisons (P ≤ 0.05), and Tukey’s test for multiple comparisons.

Results: For intact teeth, significant differences were found among all 3 subgroups, with single post showing the highest values. For 3 residual walls, oval post resulted in significantly lower values than single and multi-post systems. For 2 residual walls, the multi-post technique showed almost twice the resistance of oval post restorations.

Conclusion: In oval canals the use of a single or multi-post technique increased post-and-core resistance even in intact teeth, whereas oval fiber posts showed no improvements. Multi-post design improved fracture resistance mostly in maxillary premolars lacking both marginal ridges.



中文翻译:

单桩,椭圆桩和多桩修复技术以及残余牙齿物质的量对牙髓治疗的上颌前磨牙的断裂强度的影响

目的:本研究的目的是比较冠状动脉壁的数量和牙髓后修复体对165颗最近经牙髓治疗的上颌前磨牙的机械强度的影响。

方法:根据残壁数将牙齿分为3个对照组(无柱)和3个测试组。根据牙髓后修复的类型(单个,椭圆形和多柱技术),将每个测试组分为亚组。制备符合指定亚组的样品。万能加载机施加平行于牙齿纵轴的负载,从而模拟生理性咬合。ANOVA和采用Kruskal Wallis检验被用于比较(P ≤0.05),和Tukey检验进行多重比较。

结果:对于完整的牙齿,所有3个亚组之间均存在显着差异,其中单个帖子显示出最高的价值。对于3个剩余墙,椭圆形柱导致的值明显低于单柱和多柱系统。对于2个残留墙,多柱技术显示出几乎两倍于椭圆柱修复体的阻力。

结论:在椭圆形运河中,即使在完整的牙齿中,单柱或多柱技术的使用也会增加柱后阻力,而椭圆形纤维柱则无改善。多柱设计提高了骨折抵抗力,主要是在缺少两个边缘脊的上颌前磨牙中。

更新日期:2020-12-28
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