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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.)

Influence of Cyclic Fatigue in Water on Screw Torque Loss of Long-Span One-Piece Implant-Supported Zirconia Frameworks

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Author(s):
Tiossi, Rodrigo ; Gomes, Erica Alves ; Lapria Faria, Adriana Claudia ; Silveira Rodrigues, Renata Cristina ; Ribeiro, Ricardo Faria
Total Authors: 5
Document type: Journal article
Source: JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY; v. 26, n. 4, p. 315-320, JUN 2017.
Web of Science Citations: 3
Abstract

PurposeIt is still unclear whether four, six, or more implants should be used when restoring fully edentulous maxillae. This research evaluated the in vitro screw torque loss of zirconia frameworks supported by six implants and cantilevered zirconia frameworks supported by four implants. Materials and MethodsComputer aided design/computer-assisted machining was used to fabricate 10 one-piece frameworks. Standardized pressable porcelain crowns were fabricated and luted to the frameworks. Specimens were divided into two groups (n = 5): AO4, cantilevered 12-unit full-arch fixed dental prosthesis supported by four implants; AO6, 14-unit supported by six implants. An opposing mandibular dental arch was fabricated with bis-acrylic composite resin. Specimens were submitted to 200 N underwater cyclic load at 2-Hz frequency for 1 x 10(6) cycles in a controlled 37 degrees C temperature. A digital torque gauge assessed the initial and postload screw removal torque. Linear mixed-effects model was used for statistical analysis ( = 0.05). ResultsSignificant screw torque loss was found for AO6 after cyclic loading (before: 36.20%/after: 52.82%; p < 0.05). Group AO6 (36.20%) presented lower preload loss before the cyclic loadings compared with AO4 (60.10%) (p < 0.05). ConclusionsCyclic loading and lower implant-to-replaced-units ratio do not seem to compromise screw stability compared with higher implant-to-replaced-units ratio; however, a steep drop in preload was found before cyclic loading for both groups. (AU)

FAPESP's process: 11/01506-0 - A digital image correlation analysis and non-linear 3D-FEM on the strain distribution of screwed and cemented fixed partial dentures fabricated by a CAD/CAM system in titanium and zirconia
Grantee:Ricardo Faria Ribeiro
Support type: Regular Research Grants
FAPESP's process: 10/00124-3 - Influence of mechanical cycling on loosening of retention screw in cemented and screwed fixed partial dentures fabricated with titanium and zirconia cad/cam system. In vitro analysis and non-linear analysis by 3D-FEA.
Grantee:Erica Alves Gomes
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 10/02218-5 - Influence of mechanical cycling on loosening of retention screw in cemented and screwed fixed partial dentures fabricated with titanium and zirconia cad/cam system. In vitro analysis and non-linear analysis by 3D-FEA
Grantee:Ricardo Faria Ribeiro
Support type: Regular Research Grants
FAPESP's process: 10/19221-9 - A digital image correlation analysis and non-linear 3D-FEM on the strain distribution of screwed and cemented fixed partial dentures fabricated by a CAD/CAM system in titanium and zirconia
Grantee:Rodrigo Tiossi
Support type: Scholarships in Brazil - Post-Doctorate