Modified Y-TZP Core Design Improves All-ceramic Crown Reliability

Silva, N.R.F.A.; Bonfante, Estevam A.; Rafferty, Brian T.; Zavanelli, Ricardo Alexandre; Rekow, E. Dianne; Thompson, Van P.; Coelho, Paulo G.

doi:10.1177/0022034510384617

Cited by 81 publications

(88 citation statements)

References 31 publications

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“…The fatigue of tested groups was not considered in this study. Certainly fatigue aspect is often the clinical phenomena particularly in aged restorations [26][27][28][29]. Further studies should investigate the aging of all-ceramic systems and compare the data with the findings of this study.…”

Section: Discussionmentioning

confidence: 54%

The fracture load and failure types of veneered anterior zirconia crowns: An analysis of normal and Weibull distribution of complete and censored data

et al. 2012

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OBJECTIVES: The aim of this study was to compare the fracture load of veneered anterior zirconia crowns using normal and Weibull distribution of complete and censored data. METHODS: Standardized zirconia frameworks for maxillary canines were milled using a CAD/CAM system and randomly divided into 3 groups (N=90, n=30 per group). They were veneered with three veneering ceramics, namely GC Initial ZR, Vita VM9, IPS e.max Ceram using layering technique. The crowns were cemented with glass ionomer cement on metal abutments. The specimens were then loaded to fracture (1mm/min) in a Universal Testing Machine. The data were analyzed using classical method (normal data distribution (, ); Levene test and one-way ANOVA) and according to the Weibull statistics (s, m). In addition, fracture load results were analyzed depending on complete and censored failure types (only chipping vs. total fracture together with chipping). RESULTS: When computed with complete data, significantly higher mean fracture loads (N) were observed for GC Initial ZR (=978, =157; s=1043, m=7.2) and VITA VM9 (=1074, =179; s=1139; m=7.8) than that of IPS e.max Ceram (=798, =174; s=859, m=5.8) (p<0.05) by classical and Weibull statistics, respectively. When the data were censored for only total fracture, IPS e.max Ceram presented the lowest fracture load for chipping with both classical distribution (=790, =160) and Weibull statistics (s=836, m=6.5). When total fracture with chipping (classical distribution) was considered as failure, IPS e.max Ceram did not show significant fracture load for total fracture (=1054, =110) compared to other groups (GC Initial ZR: =1039, =152, VITA VM9: =1170, =166). According to Weibull distributed data, VITA VM9 showed significantly higher fracture load (s=1228, m=9.4) than those of other groups. SIGNIFICANCE: Both classical distribution and Weibull statistics for complete data yielded similar outcomes. Censored data analysis of all ceramic systems based on failure types is essential and brings additional information regarding the susceptibility to chipping or total fracture. DOI: https://doi.org/10.1016/j.dental. 2011.11.023 Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-56996 Accepted VersionOriginally published at: Stawarczyk, Bogna; Özcan, Mutlu; Hämmerle, Christoph H F; Roos, Malgorzata (2012 Objectives: The aim of this study was to compare the fracture load of veneered anterior zirconia crowns using normal and Weibull distribution of complete and censored data.Methods: Standardized zirconia frameworks for maxillary canines were milled using a CAD/CAM system and randomly divided into 3 groups (N=90, n=30 per group). They were veneered with three veneering ceramics, namely GC Initial ZR, Vita VM9, IPS e.max Ceram using layering technique. The crowns were cemented using glass-ionomer cement on metal abutments. The specimens were then loaded to fracture (1 mm/min) in a Universal Testing Machine. The data were analyzed using classical method (nor...

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Section: Discussionmentioning

confidence: 54%

The fracture load and failure types of veneered anterior zirconia crowns: An analysis of normal and Weibull distribution of complete and censored data

et al. 2012

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“…Before final maturation, a sample at "blue block" stage was sent for marginal fit evaluation. Final crowns were cemented to resin-based composite dies (Tetric EvoCeram, Ivoclar) and aged 30 days (Coelho et al, 2009a,b;Silva et al, 2010Silva et al, , 2011) with a self-curing resin-based dental luting material (Multilink Automix, Ivoclar) according to the manufacturer's instructions. These were then stored in water for a minimum of 7 days prior to mechanical testing.…”

Section: Methodsmentioning

confidence: 99%

Reliability of Reduced-thickness and Thinly Veneered Lithium Disilicate Crowns

et al. 2011

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The present investigation hypothesized that the reliability of reduced-thickness monolithic lithium disilicate crowns is high relative to that of veneered zirconia (Y-TZP) and comparable with that of metal ceramic (MCR) systems. CAD/CAM first mandibular molar full-crown preparations were produced with uniform thicknesses of either 1.0-mm or 2.0-mm occlusal and axial reduction, then replicated in composite for standard crown dies. Monolithic 1.0-mm (MON) and 2.0-mm CAD/ CAM lithium disilicate crowns, the latter with a buccal thin veneer (BTV) of 0.5 mm, were fabricated and then sliding-contact-fatigued (step-stress method) until failure or suspension (n = 18/group). Crack evolution was followed, and fractography of post mortem specimens was performed and compared with that of clinical specimens. Use level probability Weibull calculation (use load = 1,200 N) showed interval overlaps between MON and BTV. There was no significant difference between the Weibull characteristic failure loads of MON and BTV (1,535 N [90% CI 1,740] and 1,609 N [90% CI 1,512-1,712], respectively), which were significantly higher than that of ) and comparable with that of MCR (1,304 N [90% CI 1,414]), validating the study hypothesis.

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“…Framework design modifications of porcelain fused to metal crowns have been suggested previously in an attempt to improve strength by providing support to veneering porcelain and also to improve esthetics without compromising strength. A recent study showed that framework design modifications on the lingual and proximal sides as lingual supporting structures increased the strength and support of veneering porcelain [27][28][29] . The zirconia-ceramic crown frameworks with lingual supporting structures are becoming more popular in clinical use 30) .…”

Section: Fracture Load Of Ce-tzp/amentioning

confidence: 99%

Effect of thickness of zirconia-ceramic crown frameworks on strength and fracture pattern

et al. 2013

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The aim of the present study was to evaluate the fracture load and fracture mode of thin Ceria-stabilized tetragonal zirconia polycrystals/Al 2 O 3 nanocomposites (Ce-TZP/A) and Yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) crown frameworks. Artificial maxillary second premolars were prepared for metal-ceramic crown and all-ceramic crown restorations and Co-Cr tooth analogs were duplicated. 10 standard (0.5 mm overall thickness) zirconia-ceramic crown frameworks (Y-TZPs) for all-ceramic crown preparation and 10 modified (a 0.3-mm-thick framework increased in thickness by adding a 1.0-mm-thick palatal margin with a height of 2.0 mm) zirconia-ceramic crown frameworks (Y-TZPm, Ce-TZP/Am) for metal-ceramic crown preparation were fabricated. The frameworks were cemented to the Co-Cr tooth analog and loaded vertically until fracture. The fracture load of Y-TZPs (180.0 N) and Ce-TZP/Am (183.7 N) were significantly higher than that of Y-TZPm (133.7 N). There was a significant difference in fracture mode between Y-TZPm and Ce-TZP/Am. Within the limitation of this study, Ce-TZP/Am provide sufficient strength for clinical application.

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Modified Y-TZP Core Design Improves All-ceramic Crown Reliability

Cited by 81 publications

References 31 publications

The fracture load and failure types of veneered anterior zirconia crowns: An analysis of normal and Weibull distribution of complete and censored data

The fracture load and failure types of veneered anterior zirconia crowns: An analysis of normal and Weibull distribution of complete and censored data

Reliability of Reduced-thickness and Thinly Veneered Lithium Disilicate Crowns

Effect of thickness of zirconia-ceramic crown frameworks on strength and fracture pattern

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