Metallurgical and interfacial characterization of PFM Co–Cr dental alloys fabricated via casting, milling or selective laser melting

Cobalt-chromium alloys in dentistry: An evaluation of metal ion release

“…The LS showed the highest value because of the absence of porosity and the more fine-grained structure attributed to the sintering technique. 25,26,39,40 Collected data suggested that for the LW alloy, the ion release was significantly higher (P<.05) in artificial saliva of pH 2.3 and lowest in saline solution, in agreement with findings by Mutlu-Sagesen et al 29 However, the ions released from all the alloy was very low for all the studied solutions and exposure conditions. These observations could be explained by the anticorrosion properties of Co-Cr alloy, as related to the formation of the spontaneous oxide layer on the surface of the alloy when it is exposed to atmospheric oxygen after polishing.…”

“…29 Because metal ion release can be influenced by the composition, microstructure, and surface properties of the alloy, depending on the manufacturing technique used, 40 special attention should be paid to selecting the manufacturing method. Using x-ray scanning, Al Jabari et al 39 found gross porosity only in dental alloys fabricated by means of conventional casting (LW). The interdendritic porosity due to shrinkage during the alloy solidification weakens the structure of the prosthesis.…”

“…40 LS alloy, instead, has a homogeneous and compact structure, providing higher corrosion resistance and hardness. 39,42 The purpose of the present study was to evaluate the release of heavy metal ions from 3 differently fabricated cobalt-chromium dental alloys in the presence of saliva under physiological and altered conditions. The possible role of biocorrosion caused by oral bacteria was also investigated.…”

Defects-tolerant Co-Cr-Mo dental alloys prepared by selective laser melting

“…By correlating the pore formation to the laser energy density (LED) applied they managed to achieve higher yield strength, UTS, and elongation than those of the as-cast alloy and satisfied type 5 criteria in ISO22764. Al Jabbari et al [12] investigated the metallurgical and interfacial characters of the porcelain fused on metal (PFM) CrCo alloy restorations fabricated by milling, cast and SLM processes. Barucca et al [13] studied the structural evolution of the CrCo dental restorations made by SLM and confirmed the phase transformation from ␥ (fcc) to (hcp) and the formation of carbides by means of electron microscopy characterization.…”

Use of intraoral digital scanning for a CAD/CAM-fabricated milled bar and superstructure framework for an implant-supported, removable complete dental prosthesis

“…A wide range of computer-aided subtractive and additive manufacturing technologies can then be selected for use with associated restorative materials. [10][11][12] Although subtractive manufacturing has been primarily used in dentistry, additive manufacturing processes can create fine detail and complex internal geometries and lower the waste associated with its production process. 10,11 Acquiring digital data (intraoral digital impression) for conventional removable complete dental prostheses for the edentulous arch is challenging.…”