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A Comparative Study of the Accuracy between Plastic and Metal Impression Transfer Copings for Implant Restorations

Identifieur interne : 000013 ( Istex/Corpus ); précédent : 000012; suivant : 000014

A Comparative Study of the Accuracy between Plastic and Metal Impression Transfer Copings for Implant Restorations

Auteurs : Monica A. Fernandez ; Carmen Y. Paez De Mendoza ; Jeffrey A. Platt ; John A. Levon ; Suteera T. Hovijitra ; Arthur Nimmo

Source :

RBID : ISTEX:04CCCC12C5B13F0C3528380803CB20B8E067E760

English descriptors

Abstract

A precise transfer of the position and orientation of the antirotational mechanism of an implant to the working cast is particularly important to achieve optimal fit of the final restoration. This study evaluated and compared the accuracy of metal and plastic impression copings for use in a full‐arch mandibular edentulous simulation with four implants.

Url:
DOI: 10.1111/jopr.12015

Links to Exploration step

ISTEX:04CCCC12C5B13F0C3528380803CB20B8E067E760

Le document en format XML

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<div type="abstract">A precise transfer of the position and orientation of the antirotational mechanism of an implant to the working cast is particularly important to achieve optimal fit of the final restoration. This study evaluated and compared the accuracy of metal and plastic impression copings for use in a full‐arch mandibular edentulous simulation with four implants.</div>
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Purpose
<p>A precise transfer of the position and orientation of the antirotational mechanism of an implant to the working cast is particularly important to achieve optimal fit of the final restoration. This study evaluated and compared the accuracy of metal and plastic impression copings for use in a full‐arch mandibular edentulous simulation with four implants.</p>
Materials and Methods
<p>Metal and plastic impression transfer copings for two implant systems, Nobel Biocare™ Replace and Straumann SynOcta®, were assessed on a laboratory model to simulate clinical practice. The accuracy of producing stone casts using these plastic and metal impression transfer copings was measured against a standard prosthetic framework consisting of a cast gold bar. A total of 20 casts from the four combinations were obtained. The fit of the framework on the cast was tested by a noncontact surface profilometer, the Proscan 3D 2000 A, using the one‐screw test. The effects of implant/system and impression/coping material on gap measurements were analyzed using repeated measures ANOVA.</p>
Results
<p>The findings of this in vitro study were as follows: plastic copings demonstrated significantly larger average gaps than metal for Straumann (
<hi rend="italic">p</hi>
= 0.001). Plastic and metal copings were not significantly different for Nobel (
<hi rend="italic">p</hi>
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<hi rend="italic">p</hi>
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<hi rend="italic">p</hi>
< 0.001), indicating significant differences among the four screw locations, but the location differences were not the same for the two systems. A rank transformation of the data was necessary due to the nonnormal distribution of the gap measurements. No adjustments were made for multiple comparisons.</p>
Conclusions
<p>The metal impression copings were more accurate than plastic copings when using the Straumann system, and there was no difference between metal and plastic copings for the Nobel Replace system. The system‐by‐screw location was not conclusive, showing no correlation within each system</p>
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<p>A precise transfer of the position and orientation of the antirotational mechanism of an implant to the working cast is particularly important to achieve optimal fit of the final restoration. This study evaluated and compared the accuracy of metal and plastic impression copings for use in a full‐arch mandibular edentulous simulation with four implants.</p>
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<title type="main">Materials and Methods</title>
<p>Metal and plastic impression transfer copings for two implant systems, Nobel Biocare™ Replace and Straumann SynOcta®, were assessed on a laboratory model to simulate clinical practice. The accuracy of producing stone casts using these plastic and metal impression transfer copings was measured against a standard prosthetic framework consisting of a cast gold bar. A total of 20 casts from the four combinations were obtained. The fit of the framework on the cast was tested by a noncontact surface profilometer, the Proscan 3D 2000 A, using the one‐screw test. The effects of implant/system and impression/coping material on gap measurements were analyzed using repeated measures ANOVA.</p>
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<p>The findings of this in vitro study were as follows: plastic copings demonstrated significantly larger average gaps than metal for Straumann (
<i>p</i>
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<i>p</i>
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<i>p</i>
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<i>p</i>
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<p>The metal impression copings were more accurate than plastic copings when using the Straumann system, and there was no difference between metal and plastic copings for the Nobel Replace system. The system‐by‐screw location was not conclusive, showing no correlation within each system</p>
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<i>Submitted to the Graduate Faculty of the School of Dentistry in partial fulfillment of the requirements for the degree of Master of Science in Dentistry, Indiana University School of Dentistry</i>
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<i>This research was funded by The American College of Prosthodontists Education Foundation (ACPEF) through the 2006‐2007 Research Fellowship Award. In addition, the Whip Mix Corporation collaborated with the design and manufacturing of the holding device used to position the implant/abutment interface for the standardized and repeatable scannings with the noncontact profilometer</i>
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<affiliation>Professor & Director, Division of Prosthodontics, Department of Restorative Dental Sciences, University of Florida College of Dentistry, FL, Gainesville</affiliation>
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<publisher>Blackwell Publishing Ltd</publisher>
<dateIssued encoding="w3cdtf">2013-07</dateIssued>
<dateCreated encoding="w3cdtf">2013-07-18</dateCreated>
<dateValid encoding="w3cdtf">2012-09-20</dateValid>
<copyrightDate encoding="w3cdtf">2013</copyrightDate>
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<languageTerm type="code" authority="rfc3066">en</languageTerm>
<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
</language>
<abstract>A precise transfer of the position and orientation of the antirotational mechanism of an implant to the working cast is particularly important to achieve optimal fit of the final restoration. This study evaluated and compared the accuracy of metal and plastic impression copings for use in a full‐arch mandibular edentulous simulation with four implants.</abstract>
<abstract>Metal and plastic impression transfer copings for two implant systems, Nobel Biocare™ Replace and Straumann SynOcta®, were assessed on a laboratory model to simulate clinical practice. The accuracy of producing stone casts using these plastic and metal impression transfer copings was measured against a standard prosthetic framework consisting of a cast gold bar. A total of 20 casts from the four combinations were obtained. The fit of the framework on the cast was tested by a noncontact surface profilometer, the Proscan 3D 2000 A, using the one‐screw test. The effects of implant/system and impression/coping material on gap measurements were analyzed using repeated measures ANOVA.</abstract>
<abstract>The findings of this in vitro study were as follows: plastic copings demonstrated significantly larger average gaps than metal for Straumann (p = 0.001). Plastic and metal copings were not significantly different for Nobel (p = 0.302). Nobel had significantly larger average gaps than Straumann for metal copings (p = 0.003). Nobel had marginally smaller average gaps than Straumann (p = 0.096) for plastic copings. The system‐by‐screw location interaction was significant as well (p < 0.001), indicating significant differences among the four screw locations, but the location differences were not the same for the two systems. A rank transformation of the data was necessary due to the nonnormal distribution of the gap measurements. No adjustments were made for multiple comparisons.</abstract>
<abstract>The metal impression copings were more accurate than plastic copings when using the Straumann system, and there was no difference between metal and plastic copings for the Nobel Replace system. The system‐by‐screw location was not conclusive, showing no correlation within each system</abstract>
<subject>
<genre>keywords</genre>
<topic>Implant</topic>
<topic>impressions</topic>
<topic>jig</topic>
<topic>gap</topic>
<topic>screw test</topic>
<topic>prosthetic framework</topic>
<topic>misfit</topic>
</subject>
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<title>Journal of Prosthodontics</title>
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<title>Journal of Prosthodontics</title>
</titleInfo>
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<genre>article-category</genre>
<topic>Original Article</topic>
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<identifier type="ISSN">1059-941X</identifier>
<identifier type="eISSN">1532-849X</identifier>
<identifier type="DOI">10.1111/(ISSN)1532-849X</identifier>
<identifier type="PublisherID">JOPR</identifier>
<part>
<date>2013</date>
<detail type="volume">
<caption>vol.</caption>
<number>22</number>
</detail>
<detail type="issue">
<caption>no.</caption>
<number>5</number>
</detail>
<extent unit="pages">
<start>367</start>
<end>376</end>
<total>10</total>
</extent>
</part>
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<identifier type="istex">04CCCC12C5B13F0C3528380803CB20B8E067E760</identifier>
<identifier type="ark">ark:/67375/WNG-W52TFF5T-K</identifier>
<identifier type="DOI">10.1111/jopr.12015</identifier>
<identifier type="ArticleID">JOPR12015</identifier>
<accessCondition type="use and reproduction" contentType="copyright">© 2013 American College of Prosthodontists© 2013 by the American College of Prosthodontists</accessCondition>
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