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In vitro evaluation of fracture strength of zirconia restoration veneered with various ceramic materials

PURPOSE: Fracture of the veneering material of zirconia restorations frequently occurs in clinical situations. The purpose of this in vitro study was to compare the fracture strengths of zirconia crowns veneered with various ceramic materials by various techniques. MATERIALS AND METHODS: A 1.2 mm, 3...

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Autores principales: Choi, Yu-Sung, Kim, Sung-Hun, Lee, Jai-Bong, Han, Jung-Suk, Yeo, In-Sung
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Korean Academy of Prosthodontics 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3439627/
https://www.ncbi.nlm.nih.gov/pubmed/22977725
http://dx.doi.org/10.4047/jap.2012.4.3.162
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author Choi, Yu-Sung
Kim, Sung-Hun
Lee, Jai-Bong
Han, Jung-Suk
Yeo, In-Sung
author_facet Choi, Yu-Sung
Kim, Sung-Hun
Lee, Jai-Bong
Han, Jung-Suk
Yeo, In-Sung
author_sort Choi, Yu-Sung
collection PubMed
description PURPOSE: Fracture of the veneering material of zirconia restorations frequently occurs in clinical situations. The purpose of this in vitro study was to compare the fracture strengths of zirconia crowns veneered with various ceramic materials by various techniques. MATERIALS AND METHODS: A 1.2 mm, 360° chamfer preparation and occlusal reduction of 2 mm were performed on a first mandibular molar, and 45 model dies were fabricated in a titanium alloy by CAD/CAM system. Forty-five zirconia copings were fabricated and divided into three groups. In the first group (LT) zirconia copings were veneered with feldspathic porcelain by the layering technique. In the second group (HT) the glass ceramic was heat-pressed on the zirconia coping, and for the third group (ST) a CAD/CAM-fabricated high-strength anatomically shaped veneering cap was sintered onto the zirconia coping. All crowns were cemented onto their titanium dies with Rely X™ Unicem (3M ESPE) and loaded with a universal testing machine (Instron 5583) until failure. The mean fracture values were compared by an one-way ANOVA and a multiple comparison post-hoc test (α=0.05). Scanning electron microscope was used to investigate the fractured interface. RESULTS: Mean fracture load and standard deviation was 4263.8±1110.8 N for Group LT, 5070.8±1016.4 for Group HT and 6242.0±1759.5 N for Group ST. The values of Group ST were significantly higher than those of the other groups. CONCLUSION: Zirconia crowns veneered with CAD/CAM generated glass ceramics by the sintering technique are superior to those veneered with feldspathic porcelain by the layering technique or veneered with glass ceramics by the heat-pressing technique in terms of fracture strength.
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spelling pubmed-34396272012-09-13 In vitro evaluation of fracture strength of zirconia restoration veneered with various ceramic materials Choi, Yu-Sung Kim, Sung-Hun Lee, Jai-Bong Han, Jung-Suk Yeo, In-Sung J Adv Prosthodont Original Article PURPOSE: Fracture of the veneering material of zirconia restorations frequently occurs in clinical situations. The purpose of this in vitro study was to compare the fracture strengths of zirconia crowns veneered with various ceramic materials by various techniques. MATERIALS AND METHODS: A 1.2 mm, 360° chamfer preparation and occlusal reduction of 2 mm were performed on a first mandibular molar, and 45 model dies were fabricated in a titanium alloy by CAD/CAM system. Forty-five zirconia copings were fabricated and divided into three groups. In the first group (LT) zirconia copings were veneered with feldspathic porcelain by the layering technique. In the second group (HT) the glass ceramic was heat-pressed on the zirconia coping, and for the third group (ST) a CAD/CAM-fabricated high-strength anatomically shaped veneering cap was sintered onto the zirconia coping. All crowns were cemented onto their titanium dies with Rely X™ Unicem (3M ESPE) and loaded with a universal testing machine (Instron 5583) until failure. The mean fracture values were compared by an one-way ANOVA and a multiple comparison post-hoc test (α=0.05). Scanning electron microscope was used to investigate the fractured interface. RESULTS: Mean fracture load and standard deviation was 4263.8±1110.8 N for Group LT, 5070.8±1016.4 for Group HT and 6242.0±1759.5 N for Group ST. The values of Group ST were significantly higher than those of the other groups. CONCLUSION: Zirconia crowns veneered with CAD/CAM generated glass ceramics by the sintering technique are superior to those veneered with feldspathic porcelain by the layering technique or veneered with glass ceramics by the heat-pressing technique in terms of fracture strength. The Korean Academy of Prosthodontics 2012-08 2012-08-28 /pmc/articles/PMC3439627/ /pubmed/22977725 http://dx.doi.org/10.4047/jap.2012.4.3.162 Text en © 2012 The Korean Academy of Prosthodontics http://creativecommons.org/licenses/by-nc/3.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Choi, Yu-Sung
Kim, Sung-Hun
Lee, Jai-Bong
Han, Jung-Suk
Yeo, In-Sung
In vitro evaluation of fracture strength of zirconia restoration veneered with various ceramic materials
title In vitro evaluation of fracture strength of zirconia restoration veneered with various ceramic materials
title_full In vitro evaluation of fracture strength of zirconia restoration veneered with various ceramic materials
title_fullStr In vitro evaluation of fracture strength of zirconia restoration veneered with various ceramic materials
title_full_unstemmed In vitro evaluation of fracture strength of zirconia restoration veneered with various ceramic materials
title_short In vitro evaluation of fracture strength of zirconia restoration veneered with various ceramic materials
title_sort in vitro evaluation of fracture strength of zirconia restoration veneered with various ceramic materials
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3439627/
https://www.ncbi.nlm.nih.gov/pubmed/22977725
http://dx.doi.org/10.4047/jap.2012.4.3.162
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