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The Effect of Sintering Program on the Compressive Strength of Zirconia Copings

STATEMENT OF THE PROBLEM: Considering the limitations of conventional sintering of zirconium oxide (ZrO(2)) copings, shortening the sintering time can be proposed as an alternative method for making the copings. PURPOSE: This study aimed to assess the effects of sintering time on compressive strengt...

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Autores principales: Khaledi, Amir Ali Reza, Vojdani, Mahroo, Farzin, Mitra, Pirouzi, Soudabeh
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Journal of Dentistry Shiraz University of Medical Sciences 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6092466/
https://www.ncbi.nlm.nih.gov/pubmed/30175190
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author Khaledi, Amir Ali Reza
Vojdani, Mahroo
Farzin, Mitra
Pirouzi, Soudabeh
author_facet Khaledi, Amir Ali Reza
Vojdani, Mahroo
Farzin, Mitra
Pirouzi, Soudabeh
author_sort Khaledi, Amir Ali Reza
collection PubMed
description STATEMENT OF THE PROBLEM: Considering the limitations of conventional sintering of zirconium oxide (ZrO(2)) copings, shortening the sintering time can be proposed as an alternative method for making the copings. PURPOSE: This study aimed to assess the effects of sintering time on compressive strength of Yttria Tetragonal Zirconia Polycrystal (Y-TZP) copings. MATERIALS AND METHOD: Thirty copings of pre-sintered 3Y-TZP blanks were milled and sintered in a special furnace for three different durations (n=10 per group). The sintering time was 1 h 15 min for IPS e.max ZirCAD, 4 h 20 min for Speed ZrO(2), and 7 h 20 min for the conventional ZrO(2) group. The specimens were cemented on the brass dies by using conventional glass ionomer cement. The copings were vertically loaded until fracture by using a universal testing machine. The data were analyzed through one-way analysis of variance (ANOVA) and post hoc test to compare the mean differences of compressive strength yielded in three study groups (α=0.05). RESULTS: The mean ± SD of compressive strength value was (3617 ± 543.54) N for IPS-e.maxZirCAD group, (2663 ± 508.11) N for Speed ZrO(2) group, and (1662± 466.71 N) for conventional ZrO(2) group. There were statistically significant differences among compressive strength values of the tested groups (p< 0.05). The highest compressive strength values were obtained from the IPS e.max ZirCAD group. CONCLUSION: Within the limitations of this in vitro study, it can be concluded that compressive strength of the zirconia copings is affected by the sintering time. High compressive strength of zirconia copings can be obtained by shortening the sintering time.
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spelling pubmed-60924662018-09-01 The Effect of Sintering Program on the Compressive Strength of Zirconia Copings Khaledi, Amir Ali Reza Vojdani, Mahroo Farzin, Mitra Pirouzi, Soudabeh J Dent (Shiraz) Original Article STATEMENT OF THE PROBLEM: Considering the limitations of conventional sintering of zirconium oxide (ZrO(2)) copings, shortening the sintering time can be proposed as an alternative method for making the copings. PURPOSE: This study aimed to assess the effects of sintering time on compressive strength of Yttria Tetragonal Zirconia Polycrystal (Y-TZP) copings. MATERIALS AND METHOD: Thirty copings of pre-sintered 3Y-TZP blanks were milled and sintered in a special furnace for three different durations (n=10 per group). The sintering time was 1 h 15 min for IPS e.max ZirCAD, 4 h 20 min for Speed ZrO(2), and 7 h 20 min for the conventional ZrO(2) group. The specimens were cemented on the brass dies by using conventional glass ionomer cement. The copings were vertically loaded until fracture by using a universal testing machine. The data were analyzed through one-way analysis of variance (ANOVA) and post hoc test to compare the mean differences of compressive strength yielded in three study groups (α=0.05). RESULTS: The mean ± SD of compressive strength value was (3617 ± 543.54) N for IPS-e.maxZirCAD group, (2663 ± 508.11) N for Speed ZrO(2) group, and (1662± 466.71 N) for conventional ZrO(2) group. There were statistically significant differences among compressive strength values of the tested groups (p< 0.05). The highest compressive strength values were obtained from the IPS e.max ZirCAD group. CONCLUSION: Within the limitations of this in vitro study, it can be concluded that compressive strength of the zirconia copings is affected by the sintering time. High compressive strength of zirconia copings can be obtained by shortening the sintering time. Journal of Dentistry Shiraz University of Medical Sciences 2018-09 /pmc/articles/PMC6092466/ /pubmed/30175190 Text en Copyright: © Journal of Dentistry Shiraz University of Medical Sciences http://creativecommons.org/licenses/by-nc-sa/3.0 This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Khaledi, Amir Ali Reza
Vojdani, Mahroo
Farzin, Mitra
Pirouzi, Soudabeh
The Effect of Sintering Program on the Compressive Strength of Zirconia Copings
title The Effect of Sintering Program on the Compressive Strength of Zirconia Copings
title_full The Effect of Sintering Program on the Compressive Strength of Zirconia Copings
title_fullStr The Effect of Sintering Program on the Compressive Strength of Zirconia Copings
title_full_unstemmed The Effect of Sintering Program on the Compressive Strength of Zirconia Copings
title_short The Effect of Sintering Program on the Compressive Strength of Zirconia Copings
title_sort effect of sintering program on the compressive strength of zirconia copings
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6092466/
https://www.ncbi.nlm.nih.gov/pubmed/30175190
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