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用于螺丝固位种植体支持式修复体连接的不同金属固位螺丝疲劳后扭矩保持和抗断裂性分析

Analysis of Torque Maintenance and Fracture Resistance after Fatigue in Retention Screws Made of Different Metals for Screw-Retained Implant-Borne Prosthesis Joints.

作者信息

Bello Taborda Maria Beatriz, Yaguinuma Gonçalves Gabriela Sumie, Alves de Sousa Cecília, Gonçalves Assunção Wirley

机构信息

Department of Dental Materials and Prosthodontic, Sao Paulo State University (UNESP), Araçatuba, Brazil.

Department of Dental Materials and Prosthodontic, São Paulo State University (UNESP), Araçatuba School of Dentistry, São Paulo, Brazil.

出版信息

Int J Dent. 2021 Nov 18;2021:9693239. doi: 10.1155/2021/9693239. eCollection 2021.

DOI:10.1155/2021/9693239
PMID:34840575
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8616656/
Abstract

PURPOSE

The aim was to evaluate the effect of different metallic alloys used in the manufacture of retention screws for universal cast to long abutment (UCLA) abutments for external hexagon (HE) and Morse taper (MT) connection implants, as well as of mechanical cycling on torque maintenance and fracture resistance through electromechanical fatigue testing by mastication followed by compression testing.

METHODS

Sixty implants were used, 30 MT and 30 HE, with their respective titanium UCLA abutments and retention screws of 5 different materials ( = 6): Ti cp grade 2, Ti cp grade 4, Ti cp grade 4 hard, Ti grade 5-Ti6Al4V and surgical steel (DSP® Biomedical). The assemblies were positioned in an electromechanical masticatory fatigue testing machine. The fracture strength test was performed by compression testing in a universal testing machine EMICDL-200.

RESULTS

The cycled screws and new screws of each alloy group for each connection type were evaluated, obtaining the maximum force (FM), in order to verify the effect of mechanical cycling. The data were tabulated and submitted to appropriate statistical analysis ( = 0.05).

CONCLUSION

It was concluded that for the MT, the alloy with the best performance was steel, both in the maintenance of torque and in the compression test, and cycling negatively influenced the maintenance of preload for this connection. The alloy material did not influence torque maintenance for HE. The new screws that were subjected to EMIC showed higher strength. The alloy with the lowest strength was Ti grade 2.

摘要

目的

旨在评估用于制造外六角（HE）和莫氏锥度（MT）连接种植体的通用铸造至长基台（UCLA）基台固位螺钉的不同金属合金的效果，以及通过模拟咀嚼的机电疲劳测试后进行压缩测试来评估机械循环对扭矩维持和抗断裂性的影响。

方法

使用60颗种植体，30颗MT和30颗HE，分别搭配各自的钛制UCLA基台和5种不同材料（n = 6）的固位螺钉：2级纯钛、4级纯钛、4级硬纯钛、5级钛（Ti6Al4V）和外科手术用钢（DSP® Biomedical）。将组件放置在机电咀嚼疲劳测试机中。通过在通用测试机EMIC DL-200上进行压缩测试来进行断裂强度测试。

结果

评估每种连接类型的每个合金组的循环螺钉和新螺钉，获得最大力（FM），以验证机械循环的效果。将数据制成表格并进行适当的统计分析（α = 0.05）。

结论

得出的结论是，对于MT，在扭矩维持和压缩测试中性能最佳的合金是钢，并且循环对这种连接的预紧力维持有负面影响。合金材料对HE的扭矩维持没有影响。经过EMIC测试的新螺钉显示出更高的强度。强度最低的合金是2级钛。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/18c0/8616656/0ad4f2ff7327/IJD2021-9693239.010.jpg
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