Comparative In Vitro Study of the Bond Strength of Composite to Carbon Fiber Versus Ceramic to Cobalt-Chromium Alloys Frameworks for Fixed Dental Prostheses.

Rocio Cascos-Sanchez,Ruben Agustin-Panadero,Pedro Molinero-Mourelle,Rocio Ortega,Jaime Del Rio Highsmith,Miguel Gomez-Polo

doi:10.3390/ma13143173

Rocio Cascos-Sanchez, Ruben Agustin-Panadero + Show 4 more

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https://doi.org/10.3390/ma13143173

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Abstract

Purpose: The aim of this comparative in vitro study was to assess the bond strength and mechanical failure of carbon-fiber-reinforced composites against cobalt–chrome structures with ceramic veneering. Materials and methods: A total of 24 specimens (12 per group) simulating dental prosthetic frameworks were fabricated. The experimental specimens were subjected to a thermocycling aging process and to evaluate bond strength. All specimens were subjected to a three-point bending test to fracture using a universal testing machine. Results: The cobalt–chrome/ceramic group yielded a bond strength value of 21.71 ± 2.16 MPa, while the carbon-fiber-reinforced composite group showed 14.50 ± 3.50 MPa. The failure assessment reported statistical significance between groups. Although carbon-fiber-reinforced composite group showed lower bond strength values, the chipping incidence in this group was as well lower. Conclusions: The chrome–cobalt/ceramic group showed greater bonding strength compared to the carbon-fiber-reinforced composite; most of the fractures within the cobalt–chrome/ceramic group, had no possibility of direct clinical repair.

Highlights

Computer-aided design/computer-aided manufacturing (CAD/CAM) technology in dental medicine has allowed for the development of new biomaterials with the manufacturing of homogeneous prosthetic structures
The generated Standard Tesselaction Language (STL) file was processed by a 5-axis milling machine (S2, VHF Camfacture AG®, Ammerbuch, Germany), Table 1 and the specimens were made from chrome structures with ceramic veneering (Co–Cr) (Easy Disc, Starbond®, S&S Scheftner GmbH, Mainz, Germany) and Carbon-fiber-reinforced composite (CFRC) (Bio carbon tablet, MICRO MEDICA SRL®, Robbio, Italy) CAD/CAM discs
All the variables were sufficiently close to the Gaussian normality model

Summary

Introduction

Computer-aided design/computer-aided manufacturing (CAD/CAM) technology in dental medicine has allowed for the development of new biomaterials with the manufacturing of homogeneous prosthetic structures. Carbon-fiber-reinforced composite (CFRC) is a highly biocompatible material composed by 99.9% chemically pure carbon filaments with diameters of 5–10 μm, embedded in an epoxy resin matrix producing braided meshes with 5000 to 8000 fibers [1]. This is about 58% of its weight and 47% of its volume. CFRC has been mainly used in fixed dental prostheses (FDPs) and framework manufacturing [7,8] It presents a low specific weight, thermal expansion coefficient, electrical conductivity and a good buffering of vibration forces [1,2,3,4,5,6].

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