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논문 기본 정보

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학술저널
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대한치과보철학회 The Journal of Advanced of Prosthodontics The Journal of Advanced of Prosthodontics 제5권 제4호
발행연도
2013.1
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471 - 478 (8page)

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PURPOSE. The aim of the study was to evaluate the effect of annealing on the nanostructure and hardness of Co-Cr metal ceramic samples that were fabricated with a direct metal laser sintering (DMLS) technique. MATERIALS AND METHODS. Five groups of Co-Cr dental alloy samples were manufactured in a rectangular form measuring 4 × 2 × 2 mm. Samples fabricated by a conventional casting technique (Group I) and prefabricated milling blanks (Group II) were examined as conventional technique groups. The DMLS samples were randomly divided into three groups as not annealed (Group III), annealed in argon atmosphere (Group IV), or annealed in oxygen atmosphere (Group V). The nanostructure was examined with the small-angle X-ray scattering method. The Rockwell hardness test was used to measure the hardness changes in each group, and the means and standard deviations were statistically analyzed by one-way ANOVA for comparison of continuous variables and Tukey’ HSD test was used for post hoc analysis. P values of <.05 were accepted as statistically significant. RESULTS. The general nanostructures of the samples were composed of small spherical entities stacked atop one another in dendritic form. All groups also displayed different hardness values depending on the manufacturing technique. The annealing procedure and environment directly affected both the nanostructure and hardness of the Co-Cr alloy. Group III exhibited a non-homogeneous structure and increased hardness (48.16 ± 3.02 HRC) because the annealing process was incomplete and the inner stress was not relieved. Annealing in argon atmosphere of Group IV not only relieved the inner stresses but also decreased the hardness (27.40 ± 3.98 HRC). The results of fitting function presented that Group IV was the most homogeneous product as the minimum bilayer thickness was measured (7.11 Å). CONCLUSION. After the manufacturing with DMLS technique, annealing in argon atmosphere is an essential process for Co-Cr metal ceramic substructures. The dentists should be familiar with the materials that are used in clinic for prosthodontics treatments.
#Dental alloys #Hardness test #X-ray microanalysis #Metal ceramic alloys

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참고문헌 (23)

참고문헌 신청
Aboushelib MN / 2012 / Internal adaptation, marginal accuracy and microleakage of a pressable versus a machinable ceramic laminate veneers / J Dent 40 : 670 ~ 677 google schola Bauer JR / 2012 / Rodrigues-Filho LE, Pinto MM, Loguercio AD. Does the casting mode influence microstructure, fracture and properties of different metal ceramic al-loys / Br google schola Bolzoni L / 2012 / Mechanical behaviour of pressed and sintered titanium alloys obtained from master alloy addition powders / J Mech Behav Biomed Mater 15 : 33 ~ 45 google schola Castillo-de-Oyague R / 2012 / Vertical misfit of laser-sintered and vacuum-cast implantsupported crowncopings luted with definitive and temporary luting agents / Med Oral Pa google schola Chen CL / 2009 / Effect of annealing t google schola

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