Effect of annealing procedure on the bonding of ceramic to cobalt-chromium alloys fabricated by rapid prototyping

Tulga, Ayça

doi:10.1016/j.prosdent.2017.05.009

Cited by 17 publications

(17 citation statements)

References 25 publications

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“…The metallic groups assessed in this investigation are displayed in Table . Referring to Tulga's study, a total of 60 cylindrical shaped CoCr alloys (Ø = 10 mm, h = 1.5 mm) were fabricated using casting (C), milling (M), DMLS with and without annealing (EL+, EL), and SLM with and without annealing (CL+, CL) . Therefore, the metal specimens were categorized into six groups (n = 10) according to the fabrication technique …”

Section: Methodsmentioning

confidence: 99%

“…Direct metal laser sintering (DMLS) is a type of SLS framework that utilizes a metal powder to make metal pieces during the manufacturing procedure. Typically, SLS is used for nonmetallic materials, for example, ceramics or polymers, and DMLS is used for alloys …”

Section: Introductionmentioning

confidence: 99%

“…The most essential goals of annealing are to expand the flexibility of a metal to alleviate the stresses more quickly and to refine the structure by making it homogeneous. When assembling CoCr frameworks by utilizing the DMLS method, annealing is required to obtain homogeneous metallic structures …”

Section: Introductionmentioning

confidence: 99%

“…Although cobalt-chrome (CoCr) alloys have some disadvantages, they are still the most widely used substructure material for the fabrication of porcelain-fused-metal (PFM) restorations because of their good mechanical features and affordable cost. 1,2 The lost-wax casting technique was introduced in the 20th century and was used to construct dental crowns and bridges. Due to advances in dentistry, new methods have been developed to manufacture these restorations, such as computeraided design and computer-aided manufacturing (CAD-CAM).…”

Section: Introductionmentioning

confidence: 99%

“…Typically, SLS is used for nonmetallic materials, for example, ceramics or polymers, and DMLS is used for alloys. [1][2][3] When metals are made with laser sintering techniques, a warm treatment procedure, known as annealing, is utilized to propel the material toward its equilibrium state. The method for annealing a metal includes warming it over the basic temperature, maintaining it at a steady temperature, and then cooling it.…”

Section: Introductionmentioning

confidence: 99%

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Do repeated firings affect the color properties of porcelain‐fused‐metal restorations that are fabricated differently?

Çelik

Tulga

2019

Color Research & Application

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Repeated firings can affect the quality of the porcelain color. The purpose of this study is to evaluate the effect of repeated firings on the color changes of porcelain‐fused‐metal restorations that are manufactured using different methods. A total of 60 cylindrical shaped cobalt–chromium alloys (Ø = 10 mm and h = 1.5 mm) were fabricated using casting (C), milling (M), direct metal laser sintering with and without annealing (EL+, EL‐), and selective laser melting with and without annealing (CL+, CL‐). The samples were veneered with A2 (as indicated by the Vita Shade Guide) dentin porcelain of 2 mm thickness. Then the samples subjected to the repeated firings (2nd, 4th, 6th, 8th, and 10th), and the color of each sample was recorded using a spectrophotometer. The CIEDE2000 (ΔE00) formula was used to calculate color differences of the samples on repeated firings. Repeated measures analysis of variance (ANOVA) and post‐hoc Tukey's test were utilized to analyze the results (a = 05). The L*, a*, and b* values of porcelain‐fused‐metal specimens were significantly affected by the number of firings (P < 0.001) and fabrication techniques (P < 0.001). The ΔE00 values for C, M, CL‐, and EL‐ groups after 10th firing were above 0.8 unit, which indicates that visually perceivable color differences are clinically acceptable. On the other hand, the ΔE00 values for CL+ and EL+ groups were above the PT value after 8th repeated firings. The color properties of porcelain‐fused‐metal restorations were affected by the fabrication techniques and the number of firings.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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