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http://dx.doi.org/10.5762/KAIS.2017.18.9.244

Effect of heat treatment of core fabricated by Ni-Cr alloy on marginal and internal fit  

Kim, Jae-Hong (Department of Dental Technology, Dongnam Health University)
Kim, Ki-Baek (Department of Dental Lab Technology, Daejeon Health Institute of Technology)
Jung, Jae-Kwan (Department of Dental Lab Technology, Daejeon Health Institute of Technology)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.18, no.9, 2017 , pp. 244-250 More about this Journal
Abstract
The most important aspect determining the completeness of aprosthesis is itsmarginal and internal fit. Alloysare processed using a softening/hardening heat treatment methodin order to improve their mechanical, physical properties and polishing properties. To examinehow the heat treatment method affects the marginal and internal fit of the Ni-Cr alloy core,thirty dental stone models of the abutment of the mandibular left molar were manufactured.The Ni-Cr alloy coreswere manufactured by the dipping method for the experiment and dividedinto three groups; A for no heat treatment, B for softening heat treatment and C for hardening heat treatment. The marginal and internal fitsof all of the groups were measured by the silicone replica technique. A statistical analysis was performed using one-way ANOVA(${\alpha}=0.05$) in order to examine whether there is a significant difference in the average values of the marginal and internal fits among the three groups and it was found that themarginal fits (1, 6) were significantly different (p<0.05), but the internal fits (2, 3, 4, 5) were not significantly different (p>0.05). These results show that Ni-Cr alloys should not be processed bythe heat treatmentmethod.However, they need to be confirmed in further clinical application studies.
Keywords
Hardening heat treatment; Marginal and internal fit; Ni-Cr alloy; Softening heat treatment; Silicone replica technique;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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