Evaluation of fracture resistance of all-ceramic crowns screwed to osseointegrated implants with different connections.

• Grant number: 09/11491-0
• Support Opportunities: Scholarships in Brazil - Doctorate
• Effective date (Start): March 01, 2010
• Effective date (End): October 31, 2012
• Field of knowledge: Health Sciences - Dentistry
• Principal Investigator: Wirley Goncalves Assuncao
• Grantee: Juliana Aparecida Delben
• Host Institution: Faculdade de Odontologia (FOA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil

Abstract

The aim of this study is to evaluate the fracture resistance of all-ceramic crowns fabricated with zirconia abutments screwed to osseointegrated implants with different connections. Three groups (n=24) will be characterized: Group I - ceramic crown attached to external hexagon implants, Group II - ceramic crown attached to internal hexagon implants, Group III - ceramic crown attached to Cone Morse implant. Each group will be divided into 2 subgroups (n=12). The replicas of subgroups I.a, II.a and III.a will not be submitted to mechanical cycling while the replicas of subgroups I.b, II.b and III.b will be submitted to 2 million of cycles with oblique loading of 50N at 2hz. The implants will be embedded with autopolymerizing acrylic resin at 130° of inclination in relation to the horizontal plane. The all-ceramic crowns similar to a superior central incisor will be fabricated with zirconia abutments and ceramic veneering and attached to the implants with titanium retaining screw. All replicas will be submitted to fracture resistance test in a universal testing machine with compressive loading at 130° of inclination at 2mm/min. This test will be carried out after mechanical cycling for the replicas of subgroups I.b, II.b and III.b. Detorque measurements will be obtained after 1 million of cycles. Data will be tabled and submitted to statistical analysis.

Scientific publications

(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)

DELBEN, JULIANA A.; BARAO, VALENTIM A. R.; FERREIRA, MAYARA B.; DA SILVA, NELSON R. F. A.; THOMPSON, VAN P.; ASSUNCAO, WIRLEY G.. Influence of abutment-to-fixture design on reliability and failure mode of all-ceramic crown systems. Dental Materials, v. 30, n. 4, p. 408-416, APR 2014. (09/15060-3, 09/11491-0)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

DELBEN, Juliana Aparecida. Avaliação da confiabilidade e modo de falha de coroas cerâmicas parafusadas a implantes osseointegráveis de diferentes conexões. 2012. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Faculdade de Odontologia. Araçatuba Araçatuba.