Mechanical performance of implant-supported posterior crowns

Kok, Paul de; Kleverlaan, Cornelis J.; Jager, Niek de; Kuijs, R.H.; Feilzer, Albert J.

doi:10.1016/j.prosdent.2014.10.015

Cited by 110 publications

(90 citation statements)

References 35 publications

(47 reference statements)

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“…Monolithic zirconia crowns concentrate more stress than when made in the other evaluated materials, which corroborates previous studies 18,19 . However, it is important to note that the critical stress fracture of zirconia is so high that this stress difference observed between the groups will first cause the crown fracture when made in the other materials 4,18 .…”

Section: Discussionsupporting

confidence: 91%

Influence of crown and hybrid abutment ceramic materials on the stress distribution of implant-supported prosthesis

Tribst

Bottıno

2018

Rev. odontol. UNESP

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ResumoIntrodução: Um novo design de pilar para implantes dentários está disponível com a possibilidade de melhorar a estética sem comprometer a resistência mecânica, usando blocos cerâmicos perfurados para CAD/CAM. Objetivo: Este estudo avaliou a influência da combinação de diferentes materiais cerâmicos para coroa e para pilar híbrido na distribuição de tensões de prótese sobre implante hexágono externo. Método: Zircônia, dissilicato de lítio e cerâmica híbrida foram avaliados, totalizando 9 combinações de materiais para coroa e mesoestrutura. Para análise de elementos finitos, uma coroa monolítica cimentada sobre um pilar híbrido (mesoestrutura + base de titânio) foi modelada sobre um implante de hexágono externo. Os modelos foram exportados em formato STEP para o software de análise, e os materiais foram considerados isotrópicos, lineares, elásticos e homogêneos. Uma carga oblíqua (30°, 300N) foi aplicada no fundo da fossa central e a fixação do sistema ocorreu na base do osso. Resultado: Para a estrutura da coroa, os materiais flexíveis concentram menos tensão que os rígidos. Ao analisar o pilar híbrido, maiores valores de tensão foram observados quando feito com zircônia combinada com uma coroa de cerâmica híbrida. Em todas as combinações simuladas, a distribuição de tensões foi semelhante para o parafuso de fixação e o implante. Conclusão: Associar um material cerâmico com elevado módulo elástico para a coroa com um material de menor módulo elástico para o pilar híbrido resulta em menor concentração de tensão máxima principal, sugerindo um comportamento mecânico promissor para o sistema hexágono externo.Descritores: Cerâmica; análise de elementos finitos; implantes dentários; desenho do pilar-implante; materiais dentários. AbstractIntroduction: A new dental implant-abutment design is available with the possibility of improving aesthetic with no compromise of mechanical strength, using perforated CAD/CAM ceramic blocks. Objective: This study evaluated the influence of crown and hybrid abutment ceramic materials combination on the stress distribution of external hexagon implant supported prosthesis. Method: Zirconia, lithium disilicate and hybrid ceramic were evaluated, totaling 9 combinations of crown and mesostructure materials. For finite element analysis, a monolithic crown cemented over a hybrid abutment (mesostructure + titanium base) was modeled and screwed onto an external hexagon implant. Models were then exported in STEP format to analysis software, and the materials were considered isotropic, linear, elastic and homogeneous. An oblique load (30°, 300N) was applied to the central fossa bottom and the system's fixation occurred on the bone's base. Result: For crown structure, flexible materials concentrate less stress than rigid ones. In analyzing the hybrid abutment, it presented higher stress values when it was made with zirconia combined with a hybrid ceramic crown. The stress distribution was similar regarding all combinations for the fixation screw and implant. Conclusion: For external hexagon ...

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Section: Discussionsupporting

confidence: 91%

Influence of crown and hybrid abutment ceramic materials on the stress distribution of implant-supported prosthesis

Tribst

Bottıno

2018

Rev. odontol. UNESP

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“…Further, a linear correlation between fracture load of ceramic crown materials with adhesive cement (MLA, VAF) and flexural strength was found. These findings stand in contrast to those found in another study where crowns of various ceramic, composite or polymer materials were cemented on steel implant replicas with only one cement (RelyX Ultimate) the flexural strength of the crown materials and the fracture load did not correlate 22) . This might be due to the variety of the tested material groups (ceramic, composite, polymer) that also differ in their fracture behavior that may result in different correlations for each material group.…”

Section: Influence Of the Cement On The Fracture Loadcontrasting

confidence: 99%

Correlations between fracture load of zirconia implant supported single crowns and mechanical properties of restorative material and cement

Rohr

Märtin

Fischer

2018

Dental Materials Journal

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Zirconia implants that were restored with veneered zirconia displayed severe chipping rates of the restorations in clinical studies. Purpose of this study was to evaluate the fracture load of different zirconia implant supported monolithic crown materials (zirconia, alumina, lithium disilicate, feldspar ceramic and polymer-infiltrated ceramic) cemented with various cements (Harvard LuteCem SE, Harvard Implant Semi-permanent, Multilink Automix, VITA Adiva F-Cem). Flexural strength and fracture toughness of crown materials and compressive strength of the cements were measured. Fracture load values of crowns fabricated from lithium disilicate, feldspar ceramic and polymer-infiltrated ceramic were increased when cement with high compressive strength was used. Fracture loads for zirconia and alumina crowns were not influenced by the cement. Flexural strength and fracture toughness of the ceramics correlated linearly with the respective fracture load when using adhesive cement with high compressive strength. To achieve sufficient fracture load values, cementation with adhesive cement is essential for feldspar and polymer-infiltrated ceramic.

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“…Among different materials, monolithic zirconia crowns performed the best [120]. An in vivo follow-up study confirmed this finding, since chipping frequently occurred [59].…”

Section: Application With Dental Implantssupporting

confidence: 56%

Zirconia ceramics in metal-free implant dentistry

Han

Zhao

Shen

2016

Advances in Applied Ceramics

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Because of their outstanding mechanical properties, chemical stability, and biocompatibility, 3-mol % yttria-stabilised tetragonal zirconia polycrystals (3Y-TZP), known as zirconia ceramics in dentistry, are an important choice for various types of prosthesis. In addition to extensive use for crown and bridge construction, considerable interest has been generated for applications in implant dentistry, including full-contour zirconia crowns as supra-constructions, zirconia abutments, and novel zirconia implants. However, their use among dentist and researchers is controversial, especially compared with the well-established implants made of titanium alloys. As a latecomer, the merits and limitations of 3Y-TZP are awaiting careful investigation. Design, manufacturing, and clinical operation guidelines are urgently needed. The aim of this review was to address the present status of the application of zirconia ceramics related to implant dentistry by analysing the published data from both in vitro and in vivo studies. Suggestions are provided for potential improvements and suitable applications of zirconia ceramics in metal-free implant dentistry. ARTICLE HISTORY

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Mechanical performance of implant-supported posterior crowns

Cited by 110 publications

References 35 publications

Influence of crown and hybrid abutment ceramic materials on the stress distribution of implant-supported prosthesis

Influence of crown and hybrid abutment ceramic materials on the stress distribution of implant-supported prosthesis

Correlations between fracture load of zirconia implant supported single crowns and mechanical properties of restorative material and cement

Zirconia ceramics in metal-free implant dentistry

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