Evaluation of Marginal/Internal Fit and Fracture Load of Monolithic Zirconia and Zirconia Lithium Silicate (ZLS) CAD/CAM Crown Systems

Fit accuracy and fracture strength of milled monolithic zirconia (Zi) and zirconia-reinforced lithium silicate (ZLS) crowns are important parameters determining the success of these restorations. This study aimed to evaluate and compare the marginal and internal fit of monolithic Zi and ZLS crowns,...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Haneen A. Sadeqi, Mirza Rustum Baig, Mohammad Al-Shammari
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	monolithic zirconia lithium silicate ceramic fracture load marginal fit Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/1f2c1fc366d942539906847c61686c8b
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:1f2c1fc366d942539906847c61686c8b
record_format	dspace
spelling	oai:doaj.org-article:1f2c1fc366d942539906847c61686c8b2021-11-11T17:55:00ZEvaluation of Marginal/Internal Fit and Fracture Load of Monolithic Zirconia and Zirconia Lithium Silicate (ZLS) CAD/CAM Crown Systems10.3390/ma142163461996-1944https://doaj.org/article/1f2c1fc366d942539906847c61686c8b2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6346https://doaj.org/toc/1996-1944Fit accuracy and fracture strength of milled monolithic zirconia (Zi) and zirconia-reinforced lithium silicate (ZLS) crowns are important parameters determining the success of these restorations. This study aimed to evaluate and compare the marginal and internal fit of monolithic Zi and ZLS crowns, along with the fracture load, with and without mechanical aging. Thirty-two stone dies acquired from a customized master metal molar die were scanned, and ceramic crowns (16 Zi Ceramill Zolid HT<sup>+</sup> and 16 ZLS Vita Suprinity) were designed and milled. Absolute marginal discrepancies (AMD), marginal gaps (MG), and internal gaps (IG) of the crowns, in relation to the master metal die, were evaluated using x-ray nanotomography (<i>n</i> = 16). Next, thirty-two metal dies were fabricated based on the master metal die, and crowns (16 Zi; 16 ZLS) cemented and divided into four groups of eight each; eight Zi with mechanical aging (MA), eight Zi without mechanical aging (WMA), eight ZLS (MA), and eight ZLS (WMA). Two groups of crowns (Zi-MA; ZLS-MA) were subjected to 500,000 mechanical cycles (200 ± 50 N, 10 Hz) followed by axial compressive strength testing of all crowns, until failure, and the values were recorded. Independent sample <i>t</i> tests (α = 0.05) revealed no significant differences between Zi and ZLS crowns (<i>p</i> > 0.05); for both internal and marginal gaps, however, there were significant differences in AMD (<i>p</i> < 0.005). Independent samples Mann–Whitney U and Kruskal–Wallis tests revealed significant differences between the two materials, Zi and ZLS, regardless of fatigue loading, and for the individual material groups based on aging (α = 0.05). Multiple comparisons using Bonferroni post-hoc analysis showed significant differences between Zi and ZLS material groups, with or without aging. Within the limitations of this study, the ZLS crown fit was found to be on par with Zi, except for the AMD parameter. As regards fracture resistance, both materials survived the normal range of masticatory forces, but the Zi crowns demonstrated greater resistance to fracture. The monolithic Zi and ZLS crowns seem suitable for clinical application, based on the fit and fracture strength values obtained.Haneen A. SadeqiMirza Rustum BaigMohammad Al-ShammariMDPI AGarticlemonolithiczirconialithium silicateceramicfracture loadmarginal fitTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6346, p 6346 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	monolithic zirconia lithium silicate ceramic fracture load marginal fit Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	monolithic zirconia lithium silicate ceramic fracture load marginal fit Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Haneen A. Sadeqi Mirza Rustum Baig Mohammad Al-Shammari Evaluation of Marginal/Internal Fit and Fracture Load of Monolithic Zirconia and Zirconia Lithium Silicate (ZLS) CAD/CAM Crown Systems
description	Fit accuracy and fracture strength of milled monolithic zirconia (Zi) and zirconia-reinforced lithium silicate (ZLS) crowns are important parameters determining the success of these restorations. This study aimed to evaluate and compare the marginal and internal fit of monolithic Zi and ZLS crowns, along with the fracture load, with and without mechanical aging. Thirty-two stone dies acquired from a customized master metal molar die were scanned, and ceramic crowns (16 Zi Ceramill Zolid HT<sup>+</sup> and 16 ZLS Vita Suprinity) were designed and milled. Absolute marginal discrepancies (AMD), marginal gaps (MG), and internal gaps (IG) of the crowns, in relation to the master metal die, were evaluated using x-ray nanotomography (<i>n</i> = 16). Next, thirty-two metal dies were fabricated based on the master metal die, and crowns (16 Zi; 16 ZLS) cemented and divided into four groups of eight each; eight Zi with mechanical aging (MA), eight Zi without mechanical aging (WMA), eight ZLS (MA), and eight ZLS (WMA). Two groups of crowns (Zi-MA; ZLS-MA) were subjected to 500,000 mechanical cycles (200 ± 50 N, 10 Hz) followed by axial compressive strength testing of all crowns, until failure, and the values were recorded. Independent sample <i>t</i> tests (α = 0.05) revealed no significant differences between Zi and ZLS crowns (<i>p</i> > 0.05); for both internal and marginal gaps, however, there were significant differences in AMD (<i>p</i> < 0.005). Independent samples Mann–Whitney U and Kruskal–Wallis tests revealed significant differences between the two materials, Zi and ZLS, regardless of fatigue loading, and for the individual material groups based on aging (α = 0.05). Multiple comparisons using Bonferroni post-hoc analysis showed significant differences between Zi and ZLS material groups, with or without aging. Within the limitations of this study, the ZLS crown fit was found to be on par with Zi, except for the AMD parameter. As regards fracture resistance, both materials survived the normal range of masticatory forces, but the Zi crowns demonstrated greater resistance to fracture. The monolithic Zi and ZLS crowns seem suitable for clinical application, based on the fit and fracture strength values obtained.
format	article
author	Haneen A. Sadeqi Mirza Rustum Baig Mohammad Al-Shammari
author_facet	Haneen A. Sadeqi Mirza Rustum Baig Mohammad Al-Shammari
author_sort	Haneen A. Sadeqi
title	Evaluation of Marginal/Internal Fit and Fracture Load of Monolithic Zirconia and Zirconia Lithium Silicate (ZLS) CAD/CAM Crown Systems
title_short	Evaluation of Marginal/Internal Fit and Fracture Load of Monolithic Zirconia and Zirconia Lithium Silicate (ZLS) CAD/CAM Crown Systems
title_full	Evaluation of Marginal/Internal Fit and Fracture Load of Monolithic Zirconia and Zirconia Lithium Silicate (ZLS) CAD/CAM Crown Systems
title_fullStr	Evaluation of Marginal/Internal Fit and Fracture Load of Monolithic Zirconia and Zirconia Lithium Silicate (ZLS) CAD/CAM Crown Systems
title_full_unstemmed	Evaluation of Marginal/Internal Fit and Fracture Load of Monolithic Zirconia and Zirconia Lithium Silicate (ZLS) CAD/CAM Crown Systems
title_sort	evaluation of marginal/internal fit and fracture load of monolithic zirconia and zirconia lithium silicate (zls) cad/cam crown systems
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/1f2c1fc366d942539906847c61686c8b
work_keys_str_mv	AT haneenasadeqi evaluationofmarginalinternalfitandfractureloadofmonolithiczirconiaandzirconialithiumsilicatezlscadcamcrownsystems AT mirzarustumbaig evaluationofmarginalinternalfitandfractureloadofmonolithiczirconiaandzirconialithiumsilicatezlscadcamcrownsystems AT mohammadalshammari evaluationofmarginalinternalfitandfractureloadofmonolithiczirconiaandzirconialithiumsilicatezlscadcamcrownsystems
_version_	1718431928961466368

Evaluation of Marginal/Internal Fit and Fracture Load of Monolithic Zirconia and Zirconia Lithium Silicate (ZLS) CAD/CAM Crown Systems

Ejemplares similares