Reliability of Metalloceramic and Zirconia-based Ceramic Crowns

Silva, N.R.F.A.; Bonfante, Estevam A.; Zavanelli, Ricardo Alexandre; Thompson, Van P.; Ferencz, Jonathan L.; Coelho, Paulo G.

doi:10.1177/0022034510375826

Cited by 83 publications

(104 citation statements)

References 25 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: 53%

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: 53%

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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“…The use of accelerated life tests in dental research has been reported in a series of studies concerning the reliability of a variety of prosthetic restorative systems where a remarkable resemblance between the resulting failure modes was observed when compared to clinical failures [22][23][24][25]. Similar findings were reported when accelerated life tests were used in implant-borne reconstructions [19].…”

Section: Introductionmentioning

confidence: 72%

Reliability evaluation of alumina-blasted/acid-etched versus laser-sintered dental implants

et al. 2012

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Step-stress accelerated life testing (SSALT) and fractographic analysis were performed to evaluate the reliability and failure modes of dental implant fabricated by machining (surface treated with alumina blasting/acid etching) or laser sintering for anterior single-unit replacements. Forty-two dental implants (3.75×10 mm) were divided in two groups (n021 each): laser sintered (LS) and alumina blasting/acid etching (AB/AE). The abutments were screwed to the implants and standardized maxillary central incisor metallic crowns were cemented and subjected to SSALT in water. Use-level probability Weibull curves and reliability for a mission of 50,000 cycles at 200 N were calculated. Polarized light and scanning electron microscopes were used for failure analyses. The Beta (β) value derived from use-level probability Weibull calculation of 1.48 for group AB/AE indicated that damage accumulation likely was an accelerating factor, whereas the β of 0.78 for group LS indicated that load alone likely dictated the failure mechanism for this group, and that fatigue damage did not appear to accumulate. The reliability was not significantly different (p>0.9) between AB/AE (61 %) and LS (62 %). Fracture of the abutment and fixation screw was the chief failure mode. No implant fractures were observed. No differences in reliability and fracture mode were observed between LS and AB/AE implants used for anterior singleunit crowns.

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“…Various ceramic materials have been developed, and in some studies, their mechanical and physical characteristics have been evaluated and reported on [5][6][7] . While all-ceramic crowns are aesthetically superior, there have been concerns about their clinical application due to their relatively lower mechanical strength than metal-ceramic crowns 8) .…”

Section: Introductionmentioning

confidence: 99%

Translucency and flexural strength of monolithic translucent zirconia and porcelain-layered zirconia

Matsuzaki

Sekine

Honma

et al. 2015

Dental Materials Journal

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This study aims to investigate the effectiveness of monolithic translucent TZP with different colors and porcelain-layered TZP by evaluating their colors and strengths. Different mixing ratios of Zpex to Zpex-Yellow as translucent TZP, conventional opaque TZP (TZ-3YB-E) (Tosoh, Tokyo) as a control, and veneering porcelain (CERABIEN ZR, body porcelain, Noritake, Tokyo) with shade A3 as a typical shade. Disk-shaped specimens of 13 mm diameter and 1.5 mm thickness were prepared. These specimens were observed under reflected and transmitted light, and the translucency parameter (TP) values were measured. Strength was also evaluated with flexural strength in a biaxial bending test. The TP values of the monolithic TZP, Zpex100>Zpex70>Zpex50>TZ3YB, were larger in this order. The flexural strength of all the monolithic TZP showed approximately 1,000 MPa. It is suggested that colored translucent TZP is clinically useful when used as monolithic restorations.

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Reliability of Metalloceramic and Zirconia-based Ceramic Crowns

Cited by 83 publications

References 25 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 evaluation of alumina-blasted/acid-etched versus laser-sintered dental implants

Translucency and flexural strength of monolithic translucent zirconia and porcelain-layered zirconia

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