Research: Metals
Effect of layered manufacturing techniques, alloy powders, and layer thickness on mechanical properties of Co-Cr dental alloys
The popularity of direct metal laser sintering (DMLS) and melting (DMLM) has increased in dental practice. The layered manufacturing device, the alloy powder, and the layer thickness may affect the mechanical properties of layer-fabricated metals.Comparative analysis of the microstructures and mechanical properties of Co-Cr dental alloys fabricated by different methods
Limited information is available regarding the microstructures and mechanical properties of Co-Cr dental alloys prepared using conventional casting (CAST), computer numerical control (CNC) milling, and selective laser melting (SLM).Effect of chemical surface treatment of titanium on its bond with dental ceramics
Airborne-particle abrasion of titanium is a clinically accepted method of surface preparation. As a side effect of airborne-particle abrasion, particles of the abrasive material get embedded into the surface. How particle presence or removal from the titanium surface affects the strength of the titanium-ceramic bond is unclear.Electrochemical behavior of titanium exposed to a biofilm supplemented with different sucrose concentrations
Biofilms can reduce the corrosion resistance of titanium because of the bacterial metabolism of fermentable carbohydrates, including sucrose. However, studies evaluating whether biofilms exposed to higher sucrose concentrations can affect the electrochemical behavior of titanium are lacking.Potentiodynamic polarization study of the corrosion behavior of palladium-silver dental alloys
Although palladium-silver alloys have been marketed for over 3 decades for metal-ceramic restorations, understanding of the corrosion behavior of current alloys is incomplete; this understanding is critical for evaluating biocompatibility and clinical performance.Effect of annealing procedure on the bonding of ceramic to cobalt-chromium alloys fabricated by rapid prototyping
An annealing procedure is a heat treatment process to improve the mechanical properties of cobalt-chromium (Co-Cr) alloys. However, information is lacking about the effect of the annealing process on the bonding ability of ceramic to Co-Cr alloys fabricated by rapid prototyping.Effect of layered manufacturing techniques, alloy powders, and layer thickness on metal-ceramic bond strength
Direct metal laser sintering (DMLS) and direct metal laser melting (DMLM) have become popular for fabricating the metal frameworks of metal-ceramic restorations. How the type of layered manufacturing device, layer thickness, and alloy powder may affect the bond strength of ceramic to metal substructure is unclear.Effect of repeated ceramic firings on the marginal and internal adaptation of metal-ceramic restorations fabricated with different CAD-CAM technologies
The use of computer-aided design and computer-aided manufacturing (CAD-CAM) for metal-ceramic restorations has increased with advances in the technology. However, little is known about the marginal and internal adaptation of restorations fabricated using laser sintering (LS) and soft milling (SM). Moreover, the effects of repeated ceramic firings on the marginal and internal adaptation of metal-ceramic restorations fabricated with LS and SM is also unknown.Comparison of porcelain bond strength of different metal frameworks prepared by using conventional and recently introduced fabrication methods
Most studies evaluating dental laser sintering systems have focused on the marginal accuracy of the restorations. However, the bond strength at the metal-ceramic interface is another important factor that affects the survival of restorations, and currently, few studies focus on this aspect.Effect of production method on surface roughness, marginal and internal fit, and retention of cobalt-chromium single crowns
New production methods have been developed for metal-ceramic restorations. Different production methods may show different surface roughness and fit, which may affect retention and long-term success.Effect of casting atmosphere on the marginal deficiency and misfit of Ni-Cr alloys with and without beryllium
The marginal adaptation of prosthetic crowns is still a significant clinical problem.Bond strengths of porcelain to cobalt-chromium alloys made by casting, milling, and selective laser melting
Cobalt-chromium (Co-Cr) alloys have been widely used for metal-ceramic fixed prostheses and can be fabricated using conventionally cast or new computer-aided technology. However, the effect of different manufacturing methods on the metal-ceramic bond strength needs further evaluation.Comparison of margin discrepancy of complete gold crowns fabricated using printed, milled, and conventional hand-waxed patterns
The recent application of printing for the fabrication of dental restorations has not been compared and evaluated for margin discrepancy (margin fit) with restorations fabricated using milling and conventional hand-waxing techniques.Immunostimulatory capacity of dental casting alloys on endotoxin responsiveness
Oral metal exposure has been associated with systemic and local adverse reactions, probably due to elemental release from the alloys. Although supraphysiological concentrations of salts from dentally applied metals can activate innate cells through TLR4 (Ni, Co, Pd) and TLR3 (Au), whether direct exposure to solid alloys can also trigger innate immune reactivity is still unknown.Marginal and internal fit of metal copings fabricated with rapid prototyping and conventional waxing
Given the limitations of conventional waxing, computer-aided design and computer-aided manufacturing (CAD-CAM) technologies have been developed as alternative methods of making patterns.Evaluation of metal-ceramic bond characteristics of three dental Co-Cr alloys prepared with different fabrication techniques
Limited information is available regarding the metal-ceramic bond strength of dental Co-Cr alloys fabricated by casting (CAST), computer numerical control (CNC) milling, and selective laser melting (SLM).Evaluation of the fit of metal ceramic restorations fabricated with a pre-sintered soft alloy
Fit is an important factor influencing the success or failure of restorations. Recently, there has been increasing use of a newly developed pre-sintered soft alloy for use in computer-aided design and computer-aided manufacturing (CAD-CAM) of cobalt-chromium alloys for the fabrication of metal ceramic restorations. However, almost no studies are available on the fit of restorations fabricated in this way.Effects of lipopolysaccharides on the corrosion behavior of Ni-Cr and Co-Cr alloys
Lipopolysaccharides (LPS) are constituents of gingival crevicular fluid and may affect the base metal alloys used in metal ceramic crowns. The role of LPS in base metal alloys is currently unknown.Surface properties of Ti-35Nb-7Zr-5Ta: Effects of long-term immersion in artificial saliva and fluoride solution
The mechanical properties of new titanium alloys with an elastic modulus closest to cortical bone have been studied. However, potentially damaging conditions experienced in the oral cavity, such as fluoride ions, can initiate a localized or crevice process of corrosive degradation in the alloy surfaces.Electrochemical impedance investigation of Ni-free Co-Cr-Mo and Co-Cr-Mo-Ni dental casting alloy for partial removable dental prosthesis frameworks
The pH level of the oral environment influences corrosion in dental materials. Corrosion behaviors of Co-Cr-Mo and Co-Cr-Mo-Ni alloys in different pH environments remain undetermined.Influence of stress corrosion on the mechanical properties of laser-welded titanium
Whether laser-welded (LW) titanium can resist the stress corrosion produced by the combination of fluoride ions and stress in the oral environment is unknown.Investigation of the effect of titanium alloy surface coating with different techniques on titanium-porcelain bonding
The bond strength of dental porcelain to titanium is inadequate as a clinical alternative to conventional alloys for metal ceramic restorations.Effects of multiple firings on metal-ceramic bond strength of Co-Cr alloy fabricated by selective laser melting
Selective laser melting (SLM) is a new technique for fabricating dental restorations, but the metal–ceramic bond strength of the restorations after multiple firings must be considered because adequate bond strength is a clinical requirement for long-term performance.Effect of heating palladium-silver alloys on ceramic bond strength
The effects of different heat treatments on the internal oxidation and metal–ceramic bond in Pd-Ag alloys with different trace elements require further documentation.Corrosion resistance assessment of Co-Cr alloy frameworks fabricated by CAD/CAM milling, laser sintering, and casting methods
The effects of fabrication methods on the corrosion resistance of frameworks produced with Co-Cr alloys are not clear.
