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The effect of the digital manufacturing technique of cantilevered implant-supported frameworks on abutment screw preload

PURPOSE: The purpose of this study was to investigate the misfit and screw preload at the implant abutment connection of implant supported fixed dental prosthesis with cantilever (ICFDP) manufactured using different digital manufacturing techniques and to compare the screw preload before and after c...

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Autores principales: Altuwaijri, Shahad Mohammmed, Alotaibi, Hanan Nejer, Alnassar, Talal Mughaileth
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Korean Academy of Prosthodontics 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8891687/
https://www.ncbi.nlm.nih.gov/pubmed/35284054
http://dx.doi.org/10.4047/jap.2022.14.1.22
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author Altuwaijri, Shahad Mohammmed
Alotaibi, Hanan Nejer
Alnassar, Talal Mughaileth
author_facet Altuwaijri, Shahad Mohammmed
Alotaibi, Hanan Nejer
Alnassar, Talal Mughaileth
author_sort Altuwaijri, Shahad Mohammmed
collection PubMed
description PURPOSE: The purpose of this study was to investigate the misfit and screw preload at the implant abutment connection of implant supported fixed dental prosthesis with cantilever (ICFDP) manufactured using different digital manufacturing techniques and to compare the screw preload before and after cyclic loading. MATERIALS AND METHODS: Mandibular jaw model with four intra-foraminal implants was scanned using digital scanner. Stereolithography file was used to design a framework with nonengaging (NE) abutments and 10 mm cantilever distal to one terminal implant. Five frameworks were constructed using combined digital-conventional techniques (CAD-cast), and five frameworks were constructed using three-dimensional printing (3DP). Additional CAD-cast framework was constructed in a way that ensures passive fit (PF) to use as control. Scanning electron microscope (SEM) measured the implant abutment connection misfit. Sixty screws were used on the corresponding frameworks. Screws were torqued and pre-cyclic loading reverse torque value (RTV) was recorded. Frameworks were subjected to 200,000 loading cycles with a loading point 9 mm from the center of terminal implants adjacent to the cantilever and post-cyclic loading RTVs were recorded. RESULTS: Microscopic readings showed significant differences between frameworks. PF demonstrated the lowest measurements of 16.04 (2.6) µm while CAD-cast demonstrated the highest measurements of 29.2 (3.1) µm. In all groups, RTVs were significantly lower than the applied torque. Post-cyclic loading RTV was significantly lower than pre-cyclic loading RTV in PF and 3DP frameworks. Differences in RTVs between the three manufacturing techniques were insignificant. CONCLUSION: Although CAD-cast and three-dimensionally printed (3DP) both produce frameworks with clinically acceptable misfit, 3DP might not be the technique of choice for maintaining screw’s preload stability under an aggressive loading situation.
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spelling pubmed-88916872022-03-10 The effect of the digital manufacturing technique of cantilevered implant-supported frameworks on abutment screw preload Altuwaijri, Shahad Mohammmed Alotaibi, Hanan Nejer Alnassar, Talal Mughaileth J Adv Prosthodont Original Article PURPOSE: The purpose of this study was to investigate the misfit and screw preload at the implant abutment connection of implant supported fixed dental prosthesis with cantilever (ICFDP) manufactured using different digital manufacturing techniques and to compare the screw preload before and after cyclic loading. MATERIALS AND METHODS: Mandibular jaw model with four intra-foraminal implants was scanned using digital scanner. Stereolithography file was used to design a framework with nonengaging (NE) abutments and 10 mm cantilever distal to one terminal implant. Five frameworks were constructed using combined digital-conventional techniques (CAD-cast), and five frameworks were constructed using three-dimensional printing (3DP). Additional CAD-cast framework was constructed in a way that ensures passive fit (PF) to use as control. Scanning electron microscope (SEM) measured the implant abutment connection misfit. Sixty screws were used on the corresponding frameworks. Screws were torqued and pre-cyclic loading reverse torque value (RTV) was recorded. Frameworks were subjected to 200,000 loading cycles with a loading point 9 mm from the center of terminal implants adjacent to the cantilever and post-cyclic loading RTVs were recorded. RESULTS: Microscopic readings showed significant differences between frameworks. PF demonstrated the lowest measurements of 16.04 (2.6) µm while CAD-cast demonstrated the highest measurements of 29.2 (3.1) µm. In all groups, RTVs were significantly lower than the applied torque. Post-cyclic loading RTV was significantly lower than pre-cyclic loading RTV in PF and 3DP frameworks. Differences in RTVs between the three manufacturing techniques were insignificant. CONCLUSION: Although CAD-cast and three-dimensionally printed (3DP) both produce frameworks with clinically acceptable misfit, 3DP might not be the technique of choice for maintaining screw’s preload stability under an aggressive loading situation. The Korean Academy of Prosthodontics 2022-02 2022-02-25 /pmc/articles/PMC8891687/ /pubmed/35284054 http://dx.doi.org/10.4047/jap.2022.14.1.22 Text en © 2022 The Korean Academy of Prosthodontics https://creativecommons.org/licenses/by-nc/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0 (https://creativecommons.org/licenses/by-nc/4.0/) ) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Altuwaijri, Shahad Mohammmed
Alotaibi, Hanan Nejer
Alnassar, Talal Mughaileth
The effect of the digital manufacturing technique of cantilevered implant-supported frameworks on abutment screw preload
title The effect of the digital manufacturing technique of cantilevered implant-supported frameworks on abutment screw preload
title_full The effect of the digital manufacturing technique of cantilevered implant-supported frameworks on abutment screw preload
title_fullStr The effect of the digital manufacturing technique of cantilevered implant-supported frameworks on abutment screw preload
title_full_unstemmed The effect of the digital manufacturing technique of cantilevered implant-supported frameworks on abutment screw preload
title_short The effect of the digital manufacturing technique of cantilevered implant-supported frameworks on abutment screw preload
title_sort effect of the digital manufacturing technique of cantilevered implant-supported frameworks on abutment screw preload
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8891687/
https://www.ncbi.nlm.nih.gov/pubmed/35284054
http://dx.doi.org/10.4047/jap.2022.14.1.22
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