Effect of sintering parameters on the mechanical properties of monolithic zirconia
Background. Zirconia restorations with high mechanical properties are the current treatment options for fixed restorations with advantages of high biocompatibility and low pulp irritation. Although the effect of sintering time and temperature on the optical and mechanical properties of zirconia core...
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Tabriz University of Medical Sciences
2019-12-01
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doaj-eaa2f2ce3de143cf9794a3a5a6a1d3332020-11-25T03:28:34ZengTabriz University of Medical SciencesJournal of Dental Research, Dental Clinics, Dental Prospects2008-210X2008-21182019-12-0113424725210.15171/joddd.2019.038joddd-27493Effect of sintering parameters on the mechanical properties of monolithic zirconiaCaner Öztürk0Gülşen Can1Department of Prosthodontics, Faculty of Dentistry, Hatay Mustafa Kemal University, Hatay, TurkeyDepartment of Prosthodontics, Faculty of Dentistry, İstanbul Aydın University, Istanbul, TurkeyBackground. Zirconia restorations with high mechanical properties are the current treatment options for fixed restorations with advantages of high biocompatibility and low pulp irritation. Although the effect of sintering time and temperature on the optical and mechanical properties of zirconia core material were investigated, the effect of these parameters on the translucent monolithic zirconia is still uncertain. This study aimed to evaluate the effect of the changes in sintering temperature and holding time on the mechanical and structural properties of monolithic zirconia. Methods. Totally, 340 self-colored (A2) zirconia specimens from two different monolithic zirconia groups (n=170) were prepared, measuring 15.5×12.5×1.2 mm. Then, 17 subgroups (n=10), including the control groups, were sintered according to sintering parameters. XRD analysis was used to determine phase transformations. The surface roughness of the specimens was evaluated using profilometry, and the flexural strength of the specimens was evaluated by the three-point bending test. The data were analyzed using three-way ANOVA and post hoc multiple comparison test with Bonferroni correction (a=0.05) at a significance level of 0.05. Independent-samples t-test was used to compare the subgroups between the control groups (P˂0.05). Results. No tetragonal-to-monoclinic phase transformation was observed in the groups. Changes in the sintering parameters did not significantly affect the surface roughness and flexural strength of monolithic zirconia. Surface roughness values for all the subgroups were above the clinically critical limit. Conclusion. According to the results of this study, changes in the sintering parameters did not affect the surface phase transformation, surface roughness, and flexural strength of monolithic zirconia.https://joddd.tbzmed.ac.ir/PDF/joddd-27493flexural strengthmonolithic zirconiasintering parameterssurface roughness |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Caner Öztürk Gülşen Can |
spellingShingle |
Caner Öztürk Gülşen Can Effect of sintering parameters on the mechanical properties of monolithic zirconia Journal of Dental Research, Dental Clinics, Dental Prospects flexural strength monolithic zirconia sintering parameters surface roughness |
author_facet |
Caner Öztürk Gülşen Can |
author_sort |
Caner Öztürk |
title |
Effect of sintering parameters on the mechanical properties of monolithic zirconia |
title_short |
Effect of sintering parameters on the mechanical properties of monolithic zirconia |
title_full |
Effect of sintering parameters on the mechanical properties of monolithic zirconia |
title_fullStr |
Effect of sintering parameters on the mechanical properties of monolithic zirconia |
title_full_unstemmed |
Effect of sintering parameters on the mechanical properties of monolithic zirconia |
title_sort |
effect of sintering parameters on the mechanical properties of monolithic zirconia |
publisher |
Tabriz University of Medical Sciences |
series |
Journal of Dental Research, Dental Clinics, Dental Prospects |
issn |
2008-210X 2008-2118 |
publishDate |
2019-12-01 |
description |
Background. Zirconia restorations with high mechanical properties are the current treatment options for fixed restorations with advantages of high biocompatibility and low pulp irritation. Although the effect of sintering time and temperature on the optical and mechanical properties of zirconia core material were investigated, the effect of these parameters on the translucent monolithic zirconia is still uncertain. This study aimed to evaluate the effect of the changes in sintering temperature and holding time on the mechanical and structural properties of monolithic zirconia. Methods. Totally, 340 self-colored (A2) zirconia specimens from two different monolithic zirconia groups (n=170) were prepared, measuring 15.5×12.5×1.2 mm. Then, 17 subgroups (n=10), including the control groups, were sintered according to sintering parameters. XRD analysis was used to determine phase transformations. The surface roughness of the specimens was evaluated using profilometry, and the flexural strength of the specimens was evaluated by the three-point bending test. The data were analyzed using three-way ANOVA and post hoc multiple comparison test with Bonferroni correction (a=0.05) at a significance level of 0.05. Independent-samples t-test was used to compare the subgroups between the control groups (P˂0.05). Results. No tetragonal-to-monoclinic phase transformation was observed in the groups. Changes in the sintering parameters did not significantly affect the surface roughness and flexural strength of monolithic zirconia. Surface roughness values for all the subgroups were above the clinically critical limit. Conclusion. According to the results of this study, changes in the sintering parameters did not affect the surface phase transformation, surface roughness, and flexural strength of monolithic zirconia. |
topic |
flexural strength monolithic zirconia sintering parameters surface roughness |
url |
https://joddd.tbzmed.ac.ir/PDF/joddd-27493 |
work_keys_str_mv |
AT canerozturk effectofsinteringparametersonthemechanicalpropertiesofmonolithiczirconia AT gulsencan effectofsinteringparametersonthemechanicalpropertiesofmonolithiczirconia |
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1724583300728619008 |