Comparative Study of the Fit Accuracy of Full-Arch Bar Frameworks Fabricated with Different Presintered Cobalt-Chromium Alloys

Mai, Hang‐Nga; Kwon, Tae‐Yub; Hong, Min-Ho; Lee, Du‐Hyeong

doi:10.1155/2018/1962514

Cited by 10 publications

(11 citation statements)

References 28 publications

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“…Several studies focused on the connection between the dental crown framework and the prosthetic abutment (the natural tooth) [ 19 ] or the implant abutment [ 23 , 28 ].…”

Section: Discussionmentioning

confidence: 99%

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Casting over Metal Method Used in Manufacturing Hybrid Cobalt-Chromium Dental Prosthetic Frameworks Assembles

et al. 2021

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Cobalt–chromium (Co–Cr) alloys are the most widely used materials for removable and fixed dental prosthetic frameworks. The fitting accuracy between these components in dental prosthetic frameworks assembles (DPFAs) is largely influenced by the manufacturing method. This study presents a novel manufacturing method that combined two common techniques for obtaining one single framework: casting of Co–Cr inserts on top of parts previously manufactured by selective laser melting (SLM) of Co–Cr powder (CoM). Horizontal (n = 4) and vertical (n = 3) surfaces were microscopically analyzed (n = 770 count sum). The results revealed a high precision of the process and high fitting accuracy between the hybrid frameworks. The average distance measured between the frameworks in joined position was 41.08 ± 7.56 µm. In conclusion, the manufacturing of Co–Cr alloys DPFA using the CoM method reduced the deformation of hybrid frameworks and improved the joining accuracy between them.

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“…Several studies focused on the connection between the dental crown framework and the prosthetic abutment (the natural tooth) [ 19 ] or the implant abutment [ 23 , 28 ].…”

Section: Discussionmentioning

confidence: 99%

“…Hang-NgaMai et al reported internal discrepancy of fitting between implants abutments and milled Co–Cr framework ranging between 132.3 ± 70.8 and 148.8 ± 50.7 µm [ 23 ].…”

Section: Discussionmentioning

confidence: 99%

Casting over Metal Method Used in Manufacturing Hybrid Cobalt-Chromium Dental Prosthetic Frameworks Assembles

et al. 2021

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“…Few studies have investigated this new digital technology. Mai et al 18 evaluated the fit of complete-arch bar frameworks of different presintered Co-Cr alloys after their sintering contraction. They reported that geometric discrepancies during the sintering process were significantly influenced by the presintered Co-Cr alloys used.…”

Section: Introductionmentioning

confidence: 99%

Fitting accuracy of ceramic veneered Co-Cr crowns produced by different manufacturing processes

Maltzahn

Bernhard

Kohorst³

2020

J Adv Prosthodont

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PURPOSE. The purpose of this in vitro study was to evaluate the fitting accuracy of single crowns made from a novel presintered Co-Cr alloy prepared with a computer-aided design and computer-aided manufacturing (CAD/ CAM) technique, as compared with crowns manufactured by other digital and the conventional casting technique. Additionally, the influence of oxide layer on the fitting accuracy of specimens was tested. MATERIALS AND METHODS. A total of 40 test specimens made from Co-Cr alloy were investigated according to the fitting accuracy using a replica technique. Four different methods processing different materials were used for the manufacture of the crown copings (milling of presintered (Ceramill Sintron-group_cer_sin) or rigid alloy (Tizian NEM-group_ti_nem), selective laser melting (Ceramill NPL-group_cer_npl), and casting (Girobond NB-group_gir_ nb)). The specimens were adapted to a resin model and the outer surfaces were airborne-particle abraded with aluminum oxide. After the veneering process, the fitting accuracy (absolute marginal discrepancy and internal gap) was evaluated by the replica technique in 2 steps, before removing the oxide layer from the intaglio surface of the crowns, and after removing the layer with aluminum oxide airborne-particle abrasion. Statistical analysis was performed by multifactorial analysis of variance (ANOVA) (α=.05). RESULTS. Mean absolute marginal discrepancy ranged between 20 μm (group_cer_npl for specimens of Ceramill NPL) and 43 μm (group_cer_sin for crowns of Ceramill Sintron) with the oxide layer and between 19 μm and 28 μm without the oxide layer. The internal gap varied between 33 μm (group_ti_nem for test samples of Tizian NEM) and 75 μm (group_gir_nb for the base material Girobond NB) with the oxide layer and between 30 μm and 76 μm without the oxide layer. The absolute marginal discrepancy and the internal gap were significantly influenced by the fabrication method used (P<.05). CONCLUSION. Different manufacturing techniques had a significant influence on the fitting accuracy of single crowns made from Co-Cr alloys. However, all tested crowns showed a clinically acceptable absolute marginal discrepancy and internal gap with and without oxide layer and could be recommended under clinical considerations. Especially, the new system Ceramill Sintron showed acceptable values of fitting accuracy so it can be suggested in routine clinical work.

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“…The casting technique is based on melting of the alloy ingots and subsequent cooling for making the shape of the framework 3. The process is not only a time- and labor-intensive task but also inevitably involves shrinkage phenomenon during the cooling period of the liquefied alloy 4. When shrinkage is not completely controlled, misfit of the prosthesis to abutment occurs.…”

Section: Introductionmentioning

confidence: 99%

Comparative clinical study of the marginal discrepancy of fixed dental prosthesis fabricated by the milling-sintering method using a presintered alloy

Kim

Mai

et al. 2019

J Adv Prosthodont

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PURPOSEThe present study was designed to examine the clinical fit of fixed dental prosthesis fabricated by the milling-sintering method using a presintered cobalt-chromium alloy.MATERIALS AND METHODSTwo single metal-ceramic crowns were fabricated via milling-sintering method and casting method in each of the twelve consecutive patients who required an implant-supported fixed prosthesis. In the milling-sintering method, the prosthetic coping was designed in computer software, and the design was converted to a non-precious alloy coping using milling and post-sintering process. In the casting method, the conventional manual fabrication process was applied. The absolute marginal discrepancy of the prostheses was evaluated intraorally using the triple-scan technique. Statistical analysis was conducted using Mann-Whitney U test (α=.05).RESULTSEight patients (66.7%) showed a lower marginal discrepancy of the prostheses made using the milling-sintering method than that of the prosthesis made by the casting method. Statistically, the misfit of the prosthesis fabricated using the milling-sintering method was not significantly different from that fabricated using the casting method (P=.782). There was no tendency between the amount of marginal discrepancy and the measurement point.CONCLUSIONThe overall marginal fit of prosthesis fabricated by milling-sintering using a presintered alloy was comparable to that of the prosthesis fabricated by the conventional casting method in clinical use.

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Comparative Study of the Fit Accuracy of Full-Arch Bar Frameworks Fabricated with Different Presintered Cobalt-Chromium Alloys

Cited by 10 publications

References 28 publications

Casting over Metal Method Used in Manufacturing Hybrid Cobalt-Chromium Dental Prosthetic Frameworks Assembles

Casting over Metal Method Used in Manufacturing Hybrid Cobalt-Chromium Dental Prosthetic Frameworks Assembles

Fitting accuracy of ceramic veneered Co-Cr crowns produced by different manufacturing processes

Comparative clinical study of the marginal discrepancy of fixed dental prosthesis fabricated by the milling-sintering method using a presintered alloy

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