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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Residual stress estimated by nanoindentation in pontics and abutments of veneered zirconia fixed dental prostheses

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Author(s):
Vinicius Pavesi Fardin [1] ; Gerson Bonfante [2] ; Paulo G. Coelho ; Edmara T. P. Bergamo [4] ; Dimorvan Bordin [5] ; Malvin N. Janal [6] ; Nick Tovar [7] ; Lukasz Witek ; Estevam A. Bonfante [9]
Total Authors: 9
Affiliation:
[1] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Prótese e Periodontia - Brasil
[2] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Prótese e Periodontia - Brasil
[4] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Prótese e Periodontia - Brasil
[5] Universidade de Guarulhos - Brasil
[6] New York University College of Dentistry. Department of Epidemiology and Health Promotion - Estados Unidos
[7] New York University College of Dentistry. Department of Biomaterials - Estados Unidos
[9] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Prótese e Periodontia - Brasil
Total Affiliations: 9
Document type: Journal article
Source: Journal of Applied Oral Science; v. 30, 2022-04-22.
Abstract

Abstract Glass ceramics’ fractures in zirconia fixed dental prosthesis (FDP) remains a clinical challenge since it has higher fracture rates than the gold standard, metal ceramic FDP. Nanoindentation has been shown a reliable tool to determine residual stress of ceramic systems, which can ultimately correlate to failure-proneness. Objectives: To assess residual tensile stress using nanoindentation in veneered three-unit zirconia FDPs at different surfaces of pontics and abutments. Methodology: Three composite resin replicas of the maxillary first premolar and crown-prepared abutment first molar were made to obtain three-unit FDPs. The FDPs were veneered with glass ceramic containing fluorapatite crystals and resin cemented on the replicas, embedded in epoxy resin, sectioned, and polished. Each specimen was subjected to nanoindentation in the following regions of interest: 1) Mesial premolar abutment (MPMa); 2) Distal premolar abutment (DPMa); 3) Buccal premolar abutment (BPMa); 4) Lingual premolar abutment (LPMa); 5) Mesial premolar pontic (MPMp); 6) Distal premolar pontic (DPMp); 7) Buccal premolar pontic (BPMp); 8) Lingual premolar pontic (LPMp); 9) Mesial molar abutment (MMa); 10) Distal molar abutment (DMa); 11) Buccal molar abutment (BMa); and 12) Lingual molar abutment (LMa). Data were assessed using Linear Mixed Model and Least Significant Difference (95%) tests. Results: Pontics had significantly higher hardness values than premolar (p=0.001) and molar (p=0.007) abutments, suggesting lower residual stress levels. Marginal ridges yielded higher hardness values for connectors (DPMa, MMa, MPMp and DPMp) than for outer proximal surfaces of abutments (MPMa and DMa). The mesial marginal ridge of the premolar abutment (MPMa) had the lowest hardness values, suggesting higher residual stress concentration. Conclusions: Residual stress in three-unit FDPs was lower in pontics than in abutments. The outer proximal surfaces of the abutments had the highest residual stress concentration. (AU)

FAPESP's process: 19/08693-1 - Experimental glass-infiltrated alumina-zirconia composites: characterization of microstructure, optical and mechanical properties.
Grantee:Edmara Tatiely Pedroso Bergamo
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 21/08018-2 - Nanomechanical layer characterization of graded ATZ and ZTA composites
Grantee:Edmara Tatiely Pedroso Bergamo
Support type: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 12/19078-7 - Development and processing of Al2O3-ZrO2 translucent composite for CAD/CAM monolithic prostheses: the effect of aging on biaxial flexural strength
Grantee:Estevam Augusto Bonfante
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 11/23177-8 - Evaluation of reliability and failure modes of ceramic crown systems depending on framework design and location of load application
Grantee:Gerson Bonfante
Support type: Regular Research Grants
FAPESP's process: 16/18818-8 - Multi-User Equipment approved in grant 2012/19078-7: ElectroPuls E3000 Linear-Torsion All-Electric dynamic test instrument package
Grantee:Estevam Augusto Bonfante
Support type: Multi-user Equipment Program
FAPESP's process: 14/22859-6 - Effect of framework design of fatigued zirconia 3-unit prostheses on the nanomechanical properties
Grantee:Vinicius Pavesi Fardin
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 21/06730-7 - Towards sustainable zirconia recycled from milling waste and boosted by glass infiltration for restorative use, and of the development of strong, graded, and aging resistant multilayered zirconia blocks
Grantee:Estevam Augusto Bonfante
Support type: Research Grants - Young Investigators Grants - Phase 2
FAPESP's process: 13/20806-0 - Evaluation of damage and failure modes of fixed partial denture of totally ceramic depending on marginal ridge load application
Grantee:Vinicius Pavesi Fardin
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 11/16377-0 - Evaluation of reliability and failure modes of ceramic crown systems depending on framework design and location of load application
Grantee:Vinicius Pavesi Fardin
Support type: Scholarships in Brazil - Master