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Effects of Modifying Implant Screw Access Channels on the Amount of Extruded Excess Cement and Retention of Cement-Retained Implant-Supported Dental Prostheses: A Systematic Review Publisher Pubmed



Davoudi A1 ; Rismanchian M2
Authors
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Authors Affiliations
  1. 1. Postgraduate student, Department of Prosthodontics, Dental School, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2. Dental Implants Research Center and Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran

Source: Journal of Prosthetic Dentistry Published:2019


Abstract

Statement of problem: Cement-retained implant-supported prostheses eliminate screw loosening and enhance esthetics. However, retrievability and the possibility of removing extruded excess cement (EEC) have been problematic. Purpose: The purpose of this systematic review was to analyze the effects of modifying the screw access channel (SAC) on the amount of EEC and the retention of cement-retained implant-supported prostheses. Material and methods: PubMed, Web of Science, Scopus, and Google Scholar databases were searched with appropriate key words. Related titles and abstracts published up to June 2017 were screened and selected on the basis of defined inclusion criteria. Full texts of all studies were read and subjected to quality assessments. After the initial search, 1521 articles were included in the study. Of these, 11 studies were subjected to critical appraisal, and 10 of them were reliable enough in methodology to be systemically reviewed. Results: All the studies were in vitro and described a total of 260 specimens. According to the interpreted results, closed SACs caused lower retention with a higher amount of EEC, whereas open SACs caused the reverse. Also, as the abutment height decreased, retention decreased. Conclusions: Extending the crown's margin into the SAC, leaving the SAC open, and using internal vents in the SAC space are possible methods of modifying the SAC to gain higher retentive values. Also, the use of internal vents in the SAC system and open or partially filled SAC space reduce the amount of EEC. © 2018 Editorial Council for the Journal of Prosthetic Dentistry
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