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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 Abutment Fabrication Method on 3D Fit at the Implant-Abutment Connection

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Author(s):
Ramalho, Ilana [1] ; Witek, Lukasz [2] ; Coelho, Paulo G. [2] ; Bergamo, Edmara [1] ; Pegoraro, Luiz Fernando [1] ; Bonfante, Estevam A. [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo Bauru, Dept Prosthodont & Periodontol, Sch Dent, Bauru, SP - Brazil
[2] NYU, Dept Biomat & Biomimet, New York, NY - USA
Total Affiliations: 2
Document type: Journal article
Source: International Journal of Prosthodontics; v. 33, n. 6, p. 641-647, NOV-DEC 2020.
Web of Science Citations: 0
Abstract

Purpose: To three-dimensionally evaluate the internal fit at the implant-abutment interface of abutments fabricated with different workflows using a combination of the silicone replica technique and microcomputed tomography (mu CT). Materials and Methods: Thirty abutments were fabricated to restore internal-connection implants and were divided into three groups according to fabrication method: (1) full digital (abutment machined using CAD/CAM system); (2) Ti-Base (prefabricated standard Ti-Base abutments); and (3) UCLA (UCLA-type abutments) (n = 10/group). Linear and volume measurements were performed to assess the internal misfit using a silicone replica of the implant-abutment interface misfit area, which was three-dimensionally reconstructed after mu CT. The internal discrepancies in three different regions of interest (Gap(superior), Gap(marginal), and Gap(center)) were assessed. Data were statistically evaluated using ANOVA and Tukey test (P < .05). Results: Ti-Base and UCLA abutments presented significantly lower misfit volume (0.49 mm(3), 95% CI: +/- 0.045 mm(3) and 0.48 mm(3), 95% CI: +/- 0.045 mm(3), respectively) and mean internal gap (25.20 mu m, 95% CI: +/- 3.14 mu m and 27.97 mu m, 95% CI: +/- 3.14 mu m, respectively) than the full digital group (0.70 mm(3), 95% CI: +/- 0.045 mm(3); 34.90 mu m, 95% CI: +/- 3.14 mu m) (P < .001), but did not differ from each other (P = .825). While Gap(center) was significantly higher in the full digital group (P < .001), Gap(superior) and Gap(marginal) did not demonstrate significant differences among groups. All regions were statistically similar within groups, except for Gap(center) in the full digital group, which exhibited higher mean values compared to the other regions (P = .000). The 3D measurements for quantification of internal discrepancy were strongly associated with the 2D measurements. Conclusion: Ti-Base and UCLA abutments exhibited better internal fit at the implant-abutment interfaces compared to a fully digitalized workflow (CAD/CAM custom abutments). (AU)

FAPESP's process: 17/19362-0 - DEVELOPMENT, MECHANICAL AND OPTICAL CHARACTERIZATION OF 80% AL2O3 AND 20% ZRO2 ZTA COMPOSITES FOR CAD/CAM PROSTHESES
Grantee:Adolfo Coelho de Oliveira Lopes
Support Opportunities: Scholarships abroad - Research Internship - Master's degree
FAPESP's process: 19/08693-1 - Experimental glass-infiltrated alumina-zirconia composites: characterization of microstructure, optical and mechanical properties.
Grantee:Edmara Tatiely Pedroso Bergamo
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 16/18818-8 - Multi-User Equipment approved in grant 2012/19078-7: ElectroPuls E3000 Linear-Torsion All-Electric dynamic test instrument package
Grantee:Estevam Augusto Bonfante
Support Opportunities: Multi-user Equipment Program
FAPESP's process: 12/19078-7 - Development and processing of Al2O3-ZrO2 translucent composite for CAD/CAM monolithic prostheses: the effect of aging on biaxial flexural strength
Grantee:Estevam Augusto Bonfante
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 19/14798-0 - Development of pre-sintered ZTA 80% Al2O3/20% ZrO2 composite blocks for milling in CAD/CAM system
Grantee:Adolfo Coelho de Oliveira Lopes
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 16/17793-1 - Development and mechanical and optical characterization of 80% Al2O3 and 20% ZrO2 translucent composites for CAD/CAM monolithic prostheses
Grantee:Adolfo Coelho de Oliveira Lopes
Support Opportunities: Scholarships in Brazil - Master