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

Fracture loads and failure modes of customized and non-customized zirconia abutmentsIzabela

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Mauricio Moris, Izabela Cristina [1] ; Chen, Yung-Chung [2] ; Lapria Faria, Adriana Claudia [1] ; Ribeiro, Ricardo Faria [1] ; Fok, Alex Sui-Lun [3] ; Silveira Rodrigues, Renata Cristina [1]
Total Authors: 6
[1] Univ Sao Paulo, Dept Dent Mat & Prosthodont, Dent Sch Ribeirao Preto, Ave Cafe S-N, BR-14040904 Ribeirao Preto, SP - Brazil
[2] Natl Cheng Kung Univ Tainan, Coll Med, Inst Oral Med, 1 Daxue Rd, Tainan 701 - Taiwan
[3] Univ Minnesota, Sch Dent, Minnesota Dent Res Ctr Biomat & Biomech, 16-212 Moos Tower, 515 Delaware St SE, Minneapolis, MN 55455 - USA
Total Affiliations: 3
Document type: Journal article
Source: Dental Materials; v. 34, n. 8, p. E197-E204, AUG 2018.
Web of Science Citations: 0

Objective. This study aimed to evaluate the fracture load and pattern of customized and non-customized zirconia abutments with Morse-taper connection. Methods. 18 implants were divided into 3 groups according to the abutments used: Zr - with non-customized zirconia abutments; Zrc - with customized zirconia abutments; and Ti - with titanium abutments. To test their load capacity, a universal test machine with a 500-kgf load cell and a 0.5-mm/min speed were used. After, one implant-abutment assembly from each group was analyzed by Scanning Electron Microscopy (SEM). For fractographic analysis, the specimens were transversely sectioned above the threads of the abutment screw in order to examine their fracture surfaces using SEM. Results. A significant difference was noted between the groups (Zr=573.7 +/- 11.66 N, Zrc = 768.0 +/- 8.72 N and Ti = 659.1 +/- 7.70 N). Also, the zirconia abutments fractured while the titanium abutments deformed plastically. Zrc presented fracture loads significantly higher than Zr (p = 0.009). All the zirconia abutments fractured below the implant platform, starting from the area of contact between the abutment and implant and propagating to the internal surface of the abutment. All the zirconia abutments presented complete cleavage in the mechanical test. Fractography detected differences in the position and pattern of fracture between the two groups with zirconia abutments, probably because of the different diameters in the transmucosal region. Significance. Customization of zirconia abutments did not affect their fracture loads, which were comparable to that of titanium and much higher than the maximum physiological limit for the anterior region of the maxilla. (C) 2018 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 12/00407-0 - Analysis of misfit and torque loss after thermomechanical cycling and fracture resistance of zirconia abutments for morse cone implants.
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 10/20632-3 - In vitro biomechanical analysis of esthetical zirconia abutments, personalized and not-personalized, submitted to thermo-mechanical cycling
Grantee:Renata Cristina Silveira Rodrigues Ferracioli
Support type: Regular Research Grants