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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.)

Effect of Thermocycling on Biaxial Flexural Strength of CAD/CAM, Bulk Fill, and Conventional Resin Composite Materials

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Author(s):
Benalcazar Jalkh, E. B. [1] ; Machado, C. M. [1] ; Gianinni, M. [2] ; Beltramini, I [1] ; Piza, M. M. T. [1] ; Coelho, P. G. [3] ; Hirata, R. [4] ; Bonfante, E. A. [1]
Total Authors: 8
Affiliation:
[1] Univ Sao Paulo, Bauru Sch Dent, Dept Prosthodont & Periodontol, Bauru - Brazil
[2] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba - Brazil
[3] NYU, Dept Biomat & Biomimet, Coll Dent, Mech & Aerosp Engn, NYU Tandon Sch Engn, Hansjorg Wyss Dept Plast Surg, NYU Langone Med Ctr, New York, NY - USA
[4] NYU, Dept Biomat & Biomimet, New York, NY - USA
Total Affiliations: 4
Document type: Journal article
Source: Operative Dentistry; v. 44, n. 5, p. E254-E262, SEP-OCT 2019.
Web of Science Citations: 1
Abstract

New resin-based restorative materials have been developed, such as computer-aided design/computer-aided manufacturing (CAD/CAM) and bulk-fill composites, as an alternative to traditional layering techniques. This study evaluated the biaxial flexural strength (BFS) before and after thermocycling of five different resin composites: one hybrid resin/ceramic CAD/CAM indirect material, Lava Ultimate CAD-CAM Restorative (LU, 3M Oral Care); a conventional composite, Filtek Z350 XT (Z350, 3M Oral Care); two bulk-fill composites, Tetric N-Ceram Bulk Fill (TBF, Ivoclar Vivadent) and Filtek Bulk Fill (FBF, 3M Oral Care); and one bulk-fill flow resin composite, Filtek Bulk Fill Flow (FBFF, 3M Oral Care). Three hundred disc-shaped specimens (6.5 mm in diameter and 0.5 mm thick) were fabricated and divided into five groups (n=30 for each composite and condition). The BFS test was performed in a universal testing machine at a crosshead speed of 0.5 mm/min immediately (i, 24 hours) and after thermocycling (a, 500 thermal cycles of 5 degrees C to 55 degrees C with a 30-second dwell time). The Weibull modulus (m) and characteristic stress (ii) were calculated, and a contour plot was used (m vs ii) to detect differences between groups (95% two-sided confidence intervals). Significantly higher characteristic stress was observed for LUi (286.6 MPa) and Z350i (248.8 MPa) compared to the bulk-fill groups (FBFi=187.9 MPa, FBFFi=175.9 MPa, TBFi=149.9 MPa), with no differences between LUi and Z350i. Thermocycling significantly decreased the characteristic stress of all groups with the highest values observed for LUa (186.7 MPa) and Z350a (188.9 MPa) and the lowest for FBFFa (90.3 MPa). Intermediate values were observed for FBFa (151.6 MPa) and TBFa (122.8 MPa). The Weibull modulus decreased only for FBFa compared to FBFi. Composition and thermocycling significantly influenced the biaxial flexural strength of resin composite materials. (AU)

FAPESP's process: 19/00452-5 - EXPERIMENTAL 70%Al2O3-30%ZrO2 ZTA COMPOSITES: MECHANICAL, ESTRUCTURAL AND TOPHOGRAPHICAL CHARACTERIZATION
Grantee:Ernesto Byron Benalcazar Jalkh
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
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: 18/03072-6 - Experimental 70% Al2O3-30% ZrO2 composites: structural characterization and survival probability before and after aging
Grantee:Ernesto Byron Benalcazar Jalkh
Support Opportunities: Scholarships in Brazil - Doctorate
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: 16/18657-4 - Development and characterization of optical, topographic and crystalline phase properties of conventional ZTA composite for monolithic CAD/CAM prostheses
Grantee:Mariana Miranda de Toledo Piza
Support Opportunities: Scholarships in Brazil - Scientific Initiation