Passive Fit Analysis of Laser-Sintered, Three-Unit Implant Prostheses: An In Vitro Study.

IF 4.7 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2023-11-01 DOI:10.11607/ijp.7261

Stefano Del Monte, Shakeel Shahdad, Phil Taylor

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Abstract

Purpose: To assess if the implant-retained prostheses produced with laser-sintering technique present an accuracy and passive fit comparable to their milled counterpart.

Materials and methods: Two regular neck Straumann analogs were placed in a block of PMMA 15 mm apart and parallel to each other. The PMMA block was then scanned and two groups of cobalt-chromium, screw-retained, three-unit implant prostheses were fabricated using milling (control) and laser-sintering (test) techniques. The prostheses were then screwed on the PMMA block and the vertical marginal gap between the prostheses and the analogs at the implant-abutment junction was measured twice, (1) when only one screw was tightened, and (2) when both screws were fully tightened. The average of each marginal gap measurement was compared to assess the difference in term of passive fit between the laser-sintered and the milled prostheses.

Results: The mean marginal gap of the milled and the laser-sintered groups were 23.18 µm (SD = 6.2) and 23.71 µm (SD = 19.5) respectively.

Conclusions: Laser-sintered prostheses presented a marginal fit comparable to their milled counterpart and represent a clinically valid alternative to their milled counterpart. Int J Prosthodont 2023;36:e53-e60.

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激光烧结三单元种植体假体的被动拟合分析：体外研究。

目的：评估用激光烧结技术生产的植入物保留假体是否具有与铣削假体相当的准确性和被动配合性。材料和方法：将两个规则颈Straumann类似物放置在相距15mm且彼此平行的PMMA块中。然后扫描PMMA块，并使用铣削（对照）和激光烧结（测试）技术制造两组钴铬螺钉固定的三单元植入假体。然后将假体拧在PMMA块上，并测量假体和类似物之间在植入物-基牙连接处的垂直边缘间隙两次，（1）当仅拧紧一个螺钉时，以及（2）当两个螺钉都完全拧紧时。比较每个边缘间隙测量的平均值，以评估激光烧结假体和铣削假体之间的被动配合差异。结果：铣削组和激光烧结组的平均边缘间隙分别为23.18µm（SD=6.2）和23.71µm（SD=19.5）。结论：激光烧结假体与铣削假体相比具有边缘匹配性，是铣削假体的临床有效替代品。Int J Prostodont 2023；36:e53-e60。

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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464

期刊介绍： ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.