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:: Volume 21, Issue 1 (jrds 2024) ::
J Res Dent Sci 2024, 21(1): 53-60 Back to browse issues page
In vitro effect of zirconia type on marginal and internal fit of a three-unit bridge.
Vahid Fakhrzadeh , Amirhossein Rafiei , Ghazal Ranjbar , Elnaz Moslehifard *
Faculty of Dentistry, Tabriz University of Medical , elnaz_moslehi@yahoo.com
Abstract:   (921 Views)
Background and Aims: The purpose of this study is to evaluate the effect of the type of zirconia (multilayer or monochrome) on the marginal and internal fit of a three-unit bridge.
Material and Methods: In a maxillary model, the first premolar and first molar were prepared to receive 3-unit zirconia fixed dental prostheses and then scanned. Each scan was used to make two bridges (one with multi-layer and the other with monochrome zirconia). With Exocad software, the bridge was designed and then milled. The bridges milled in the previous stage were evaluated and compared with the replica method in terms of internal and marginal fit. For statistical analysis, an independent t-test was used to evaluate marginal, cervical, and axial fit, and the Mann-Whitney test was used to evaluate occlusal fit. (P = 0.05)
Result: The average marginal and cervical gaps in monochrome zirconia were 65.30±20.00 and 72.42 ±10.11 micrometers, respectively, and in multi-layer zirconia were 70.76±14.71 and 78.74±11.91 micrometers, and this difference was not statistically significant (P>0.05). The average axial and occlusal gaps in monochrome zirconia were 102.5±10.70 and 118.9±18.52 micrometers respectively and in multilayer zirconia 114.8±18.88 and 141.6±29.88 micrometers, this difference was statistically significant and the average gap in monochrome zirconia was less than multilayer zirconia (P<0.05).
Conclusion: Monochrome zirconia restorations show similar marginal and internal fit compared to multilayer zirconia restorations. Although the occlusal and axial gap in multi-layer zirconia is more than in monochrome zirconia, it is within the clinically acceptable range. Multilayer zirconia is generally clinically usable.

 
Keywords: internal fir, marginal fir, replica
Full-Text [PDF 732 kb]   (622 Downloads)    
Type of Study: original article | Subject: Prothesis
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Ethics code: IR.TBZMED.VCR.REC.1401.413



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Fakhrzadeh V, Rafiei A, Ranjbar G, Moslehifard E. In vitro effect of zirconia type on marginal and internal fit of a three-unit bridge.. J Res Dent Sci 2024; 21 (1) :53-60
URL: http://jrds.ir/article-1-1487-en.html


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Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Volume 21, Issue 1 (jrds 2024) Back to browse issues page
مجله تحقیق در علوم دندانپزشکی Res Dent Sci
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