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Effect of framework design of fatigued zirconia 3-unit prostheses on the nanomechanical properties

Grant number: 14/22859-6
Support Opportunities:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): January 31, 2015
Effective date (End): January 30, 2016
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Gerson Bonfante
Grantee:Vinicius Pavesi Fardin
Supervisor: Paulo G. Coelho
Host Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil
Research place: New York University, United States  
Associated to the scholarship:13/20806-0 - Evaluation of damage and failure modes of fixed partial denture of totally ceramic depending on marginal ridge load application, BP.DR


The excellent mechanical properties of zirconia (Y- TZP) allow it to be the choice system for posterior fixed dental prostheses (FDP). However, problems related to porcelain veneer crack persist. The lack of framework support to porcelain and the residual stress of the porcelain veneer are indicated as possible cause. Twenty maxillary 3-unit FDPs with second premolar pontic were fabricated (Ceramil Amanngirbach, Koblach, Austria) to comprise the following groups: 1) Y-TZP even: even framework thickness of 0,5 mm and 9 mm2 connector area; 2) Y-TZP mod: Y-TZP with modified framework (2 mm lingual collar with 3,5 mm height proximal struts) and 12 mm2 connector area). The porcelain veneer (IPS e.max Ceram Transpaclear) was hand layered and the open furnace at 450° C for glaze firing was respect. Forty composite-resin replicas of both first premolar and first molar prepared crowns were fabricated, cemented (RelyX-U200, 3M-Espe), and subjected to cyclic loading in water (1 million cycles or until fracture with load range from 30-300 N, at 2Hz, 3.18 mm radius lithium disilicate indenter) at 37°C. After the fatigue test, a precision diamond saw will cut parallel to occlusal surface to obtain one flat piece with 1 mm of thickness that will be ground in water and polished with diamond suspensions. Fifteen indentations with 10 µm of minimum separation from four different surfaces of each crown will be nanomechanically (TI 950 TriboIndenter) evaluated under dry. The specimen will be loaded to a peak load 4 µN, without hold constant and unload. Elastic modulus (E, GPa) and hardness (H, GPa) will be computed. (AU)

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Scientific publications (7)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
VINICIUS PAVESI FARDIN; GERSON BONFANTE; PAULO G. COELHO; EDMARA T. P. BERGAMO; DIMORVAN BORDIN; MALVIN N. JANAL; NICK TOVAR; LUKASZ WITEK; ESTEVAM A. BONFANTE. Residual stress estimated by nanoindentation in pontics and abutments of veneered zirconia fixed dental prostheses. Journal of Applied Oral Science, v. 30, . (12/19078-7, 16/18818-8, 19/08693-1, 13/20806-0, 14/22859-6, 21/06730-7, 11/23177-8, 21/08018-2, 11/16377-0)
HIRATA, RONALDO; BONFANTE, ESTEVAM A.; ANCHIETA, RODOLFO B.; MACHADO, LUCAS S.; FREITAS, GILEADE; FARDIN, VINICIUS P.; TOVAR, NICK; COELHO, PAULO G.. Reliability and failure modes of narrow implant systems. CLINICAL ORAL INVESTIGATIONS, v. 20, n. 7, p. 1505-1513, . (14/22859-6, 13/20806-0)
BONFANTE, ESTEVAM A.; SUZUKI, MARCELO; HIRATA, RONALDO; BONFANTE, GERSON; FARDIN, VINICIUS P.; COELHO, PAULO G.. Resin composite repair for implant-supported crowns. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS, v. 105, n. 6, p. 1481-1489, . (14/22859-6, 10/06152-9, 13/20806-0)
FARDIN, VINICIUS P.; DE PAULA, VITOR GUARCONI; BONFANTE, ESTEVAM A.; COELHO, PAULO G.; BONFANTE, GERSON. Lifetime prediction of zirconia and metal ceramic crowns loaded on marginal ridges. Dental Materials, v. 32, n. 12, p. 1543-1554, . (13/20806-0, 11/23177-8, 14/22859-6, 11/16377-0, 12/19078-7)
FARDIN, VINICIUS P.; BERGAMO, EDMARA T. P.; BORDIN, DIMORVAN; HIRATA, RONALDO; BONFANTE, ESTEVAM A.; BONFANTE, GERSON; COELHO, PAULO G.. Effect of different tightening protocols on the probability of survival of screw-retained implant-supported crowns. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 126, . (21/08018-2, 11/16377-0, 16/18818-8, 13/20806-0, 14/22859-6, 21/06730-7, 11/23177-8)
BORDIN, DIMORVAN; WITEK, LUKASZ; FARDIN, VINICIUS P.; BONFANTE, ESTEVAM A.; COELHO, PAULO G.. Fatigue Failure of Narrow Implants with Different Implant-Abutment Connection Designs. JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY, v. 27, n. 7, p. 659-664, . (14/22859-6, 13/20806-0)
FARDIN, VINICIUS P.; BONFANTE, ESTEVAM A.; COELHO, PAULO G.; JANAL, MALVIN N.; TOVAR, NICK; WITEK, LUKASZ; BORDIN, DIMORVAN; BONFANTE, GERSON. Residual stress of porcelain-fused to zirconia 3-unit fixed dental prostheses measured by nanoindentation. Dental Materials, v. 34, n. 2, p. 260-271, . (16/18818-8, 12/19078-7, 11/23177-8, 14/22859-6, 13/20806-0, 11/16377-0)

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