A clinical evaluation of cobalt-chromium metal-ceramic fixed partial dentures and crowns: A three- to seven-year retrospective study

Eliasson, Alf; Arnelund, Carl-Fredrik; Johansson, Anders

doi:10.1016/s0022-3913(07)60032-8

Cited by 89 publications

(68 citation statements)

References 41 publications

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“…This has been confirmed by many studies concerning the longevity of Co-Cr alloy showing no adverse reactions to the patients [5].…”

Section: Introductionsupporting

confidence: 60%

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Comparison of Retention Forces of Different Fabrication Methods of Co-Cr Crowns: Pre-sintered and Milled, Cast and Electroforming Secondary Crowns with Different Taper Angles

Stawarczyk¹,

Wagner²,

Merk³

et al. 2015

IJDOS

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To investigate the retention forces of differently fabricated secondary crowns made of Co-Cr alloy and electroforming secondary crowns considering different taper angles. Cobalt-chromium primary crowns with 0°, 1°and 2°taper angles were fabricated. Secondary crowns were made either by i) amilling and sintering, ii) castingor iii) electro-forming process. Pull-off tests were performed and data were analyzed by parametric statistics (p<0.05). With regard to the different taper angles, Co-Cr milled and cast groups, no impact on retention force was observed. Within the electroforming group, primary crowns with a taper angle of 1°showed a higher retention force than crowns with angles of 0°or 2°. With respect to the secondary crowns, primary crowns with a taper angle of 1°showed no impact on the results. Within the taper angles of 0°and 2°, the electroforming group exhibited lower retention forces than cast or milled ones. In the 0°taper angle group, milled secondary crowns displayed higher values than cast ones.

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“…This has been confirmed by many studies concerning the longevity of Co-Cr alloy showing no adverse reactions to the patients [5].…”

Section: Introductionsupporting

confidence: 60%

“…Especially metal alloys belong to these long-time proven materials under which cobalt-chromium (Co-Cr) is entrenched [2] due to its mechanical strength [3] and high young's modulus [2]. With its high corrosion resistance [4] and its high biocompatibility [3,5], CoCr alloys are especially suitable for prosthodontic restorations [2].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Retention Forces of Different Fabrication Methods of Co-Cr Crowns: Pre-sintered and Milled, Cast and Electroforming Secondary Crowns with Different Taper Angles

Stawarczyk¹,

Wagner²,

Merk³

et al. 2015

IJDOS

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“…This was in accordance with the study done by Anders Örtorp. The reason for high marginal discrepancy for conventional cast cobalt chrome alloys may be due to higher fusion temperature, which causes dimensional changes due to high coefficient of thermal contraction associated with the cooling of the solidified alloys and also due to difference in alloy compositions [7,22].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Internal and Marginal Fit of Two Metal Ceramic System – In Vitro Study

M¹,

Ifthikar²,

Subramanian³

et al. 2014

JCDR

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Precise marginal seating and internal fit of cast restorations are important factors to fulfil biological, physical and aesthetic requirements of restorations. Marginal fit and Internal fit relies on both clinical and laboratory procedures. Accurate fit of the restoration margin to the finish line is necessary to prevent gingival inflammation and secondary caries, which will lead to failure of prosthesis [2].The ability to fabricate precisely fitting casting is the principle objective [3]. Though there has been many recent advances in investing materials, alloy composition and casting techniques to improve the internal adaptation and marginal seating of cast restoration the casting procedure is very technique sensitive and discrepancies are very much common [4,5]. The common causes of discrepancies are due to cumulative results of many variables such as distortion of Dentistry SectionEvaluation of Internal and Marginal Fit of Two Metal Ceramic System -In Vitro Study ABSTRACT Introduction: The high strength porcelain fused metal crowns have been extensively used in dentistry. However, the fit is the most encountered problems in porcelain fused metal crowns. This mainly depends on the fabrication technique. Aim:The purpose was to compare the internal and marginal fit of laser sintered and conventionally casted Cobalt-Chromium copings. Materials and Methods:Twenty stainless steel dies of dimension 15 x 10 mm with 1 mm finish margin were fabricated using CAD-CAM technology. Twenty dies were divided into two groups Group 1 and Group 2 containing 10 samples each. All 20 dies were scanned using LAVA 3M scanner and data were used to fabricate metal copings using Laser sintering technique (Group-1) and Conventional casting technique (Group-2).Copings were cemented onto respective dies and finished and standardized sectioning were made. The sectioned models were scanned under stereomicroscope at 50 x magnification for internal and marginal fit evaluation.Results: Mean and standard deviation of internal and marginal discrepancy of laser sintered copings/conventional cast metal copings was 107.6 ± 10.9µ and 102.1 ± 17.2µ/187.09 ± 11.47 µ and 176.57 ± 25.82 µ respectively. Statistical analysis showed the laser sintered copings have lesser internal and marginal discrepancy than conventional casted copings with p value < 0.001. Conclusion:The laser sintered Co-Cr copings showed better internal and marginal fit when compared to that of conventional Co-Cr casted copings.

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“…Dental alloys on the basis of cobalt and chromium are one of the most preferred for production of metal frameworks of dental constructions because of their high strength, high corrosion and wear resistance, high biocompatibility, and a relatively low cost [1,2]. The chemical composition of Co-Cr dental alloys consists of 53-67% of Co, 25-32% of Cr, 2-6% of Mo, and small quantities of W, Si, Al, and others [3].…”

Section: Introductionmentioning

confidence: 99%

Properties of Co-Cr Dental Alloys Fabricated Using Additive Technologies

Dikova¹

2018

Biomaterials in Regenerative Medicine

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The aim of the present paper is to make a review of the properties of dental alloys, fabricated using Additive Technologies (AT). The microstructure and mechanical properties of Co-Cr alloys as well as the accuracy and surface roughness of dental constructions are discussed. In dentistry two diferent approaches can be applied for production of metal frameworks using AT. According to the irst one the wax/polymeric cast paterns are fabricated by 3D printing, than the constructions are cast from dental alloy with asprinted paterns. Through the second one the metal framework is manufactured form powder alloy directly from 3D virtual model by Selective Electron Beam Melting (SEBM) or Selective Laser Melting (SLM). The microstructure and mechanical properties of Co-Cr dental alloys, cast using 3D printed paterns, are typical for cast alloys. Their dimensional and adjustment accuracy is higher comparing to constructions, produced by traditional lost-wax casting or by SLM. The surface roughness is higher than that of the samples, cast by conventional technology, but lower comparing to the SLM objects. The microstructure of SLM Co-Cr dental alloys is ine grained and more homogeneous comparing that of the cast alloys, which deines higher hardness and mechanical properties, higher wear and corrosion resistance.Keywords: materials science and engineering, biomaterials, regenerative stomatology, additive technologies, Co-Cr dental alloys, microstructure and properties IntroductionDental alloys on the basis of cobalt and chromium are one of the most preferred for production of metal frameworks of dental constructions because of their high strength, high corrosion and wear resistance, high biocompatibility, and a relatively low cost [1,2]. The chemical composition of Co-Cr dental alloys consists of 53-67% of Co, 25-32% of Cr, 2-6% of Mo, and small © 2018 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.quantities of W, Si, Al, and others [3]. Cr, Mo, and W are added for strengthening of the solid solution. Due to the relatively large amount of Cr, dense passive layer of Cr 2 O 3 with 1-4 nm thickness on the surface as well as carbides in the microstructure of the details is formed, determining the high hardness, high corrosion, and wear resistance [4,5]. According to the phase diagram, Co-Cr dental alloys are characterized with face-centered cubic (fcc) latice, γ phase in high temperatures, and with hexagonal close packed (hcp) latice, ε phase in room temperature [4,6]. The γ phase deines the ductility, while the ε phase deines the corrosion and wear resistance of the alloy [7]. In proper alloying, the microstructure of the Co-Cr dental alloys consists mainly of γ phase and carbides of the M 23 C 6 type [4]. Therefore, the properties of Co-Cr dental alloys depend on the ratio between...

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A clinical evaluation of cobalt-chromium metal-ceramic fixed partial dentures and crowns: A three- to seven-year retrospective study

Cited by 89 publications

References 41 publications

Comparison of Retention Forces of Different Fabrication Methods of Co-Cr Crowns: Pre-sintered and Milled, Cast and Electroforming Secondary Crowns with Different Taper Angles

Comparison of Retention Forces of Different Fabrication Methods of Co-Cr Crowns: Pre-sintered and Milled, Cast and Electroforming Secondary Crowns with Different Taper Angles

Evaluation of Internal and Marginal Fit of Two Metal Ceramic System – In Vitro Study

Properties of Co-Cr Dental Alloys Fabricated Using Additive Technologies

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