Author(s):
Tribst, João P.M. [UNESP] ; Dal Piva, Amanda M.O. [UNESP] ; Borges, Alexandre L.S. [UNESP] ; Anami, Lilian C. ; Kleverlaan, Cornelis J. ; Bottino, Marco A. [UNESP]
Date: 2020
Persistent ID: http://hdl.handle.net/11449/200445
Origin: Oasisbr
Subject(s): Ceramics; Dental implant-abutment design; Dental implants; Dental materials; Finite element analysis; Material testing; Ceramics; Ceramics; Dental implant-abutment design; Dental implant-abutment design; Dental implants; Dental implants; Dental materials; Dental materials; Finite element analysis; Finite element analysis; Material testing; Material testing
Description
Made available in DSpace on 2020-12-12T02:06:51Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-04-01
Different techniques are available to manufacture polymer-infiltrated ceramic restorations cemented on a chairside titanium base. To compare the influence of these techniques in the mechanical response, 75 implant-supported crowns were divided in three groups: CME (crown cemented on a mesostructure), a two-piece prosthetic solution consisting of a crown and hybrid abutment; MC (monolithic crown), a one-piece prosthetic solution consisting of a crown; and MP (monolithic crown with perforation), a one-piece prosthetic solution consisting of a crown with a screw access hole. All specimens were stepwise fatigued (50 N in each 20,000 cycles until 1200 N and 350,000 cycles). The failed crowns were inspected under scanning electron microscopy. The finite element method was applied to analyze mechanical behavior under 300 N axial load. Log-Rank (p = 0.17) and Wilcoxon (p = 0.11) tests revealed similar survival probability at 300 and 900 N. Higher stress concentration was observed in the crowns' emergence profiles. The MP and CME techniques showed similar survival and can be applied to manufacture an implant-supported crown. In all groups, the stress concentration associated with fractographic analysis suggests that the region of the emergence profile should always be evaluated due to the high prevalence of failures in this area.
Department of Dental Materials and Prosthodontics São Paulo State University (Unesp/SJC) Institute of Science and Technology
Department of Dentistry Santo Amaro University (UNISA)
Department of Dental Materials Science Academic Centre for Dentistry Amsterdam (ACTA) Universiteit van Amsterdam and Vrije Universiteit
Department of Dental Materials and Prosthodontics São Paulo State University (Unesp/SJC) Institute of Science and Technology
