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نویسندگان مقالات پربازدید :
مجله رفتار مکانیکی مواد زیست پزشکی
جزئیات رویداد
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  • shear bond strength of a hot pressed au–pd–pt alloy–porcelain dental composite

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    • تاریخ ارائه: 1394/01/01
    • تاریخ انتشار در تی پی بین: 1394/01/01
    • تعداد بازدید: 728
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     objectives: the purpose of this study was to evaluate the effect of hot pressing on the shear bond strength of a au–pt–pd alloy–porcelain composite. methods: several metal–porcelain composites specimens were produced by two different routes: conventional porcelain fused to metal (pfm) and hot pressing. in the latter case, porcelain was hot pressed onto a polished surface (ppps) as well as a roughened one (pprs). bond strength of all metal–porcelain composites were assessed by the means of a shear test performed in a universal test machine (crosshead speed: 0.5 mm/min) until fracture. interfaces of fractured specimens as well as undestroyed interface specimens were examined with optical microscope, stereomicroscope, scanning electron microscope (sem) and energy dispersive x-ray spectroscopy (eds). the data were analyzed using one-way anova followed by tuckey’s test (p<0.05). results: shear bond strength of conventional pfm specimens were in line with the upper range of literature data (83±14 mpa). hot pressing proved to significantly increase bond strength between metal and porcelain (p<0.05). for both polished and roughened surface the shear bond strength values for hot pressed specimens were 120±16 mpa and 129±5 mpa, respectively, which represents an improvement of more than 50% relatively to a conventional pfm. roughened surface did not have a significant effect on bond strength of hot pressed specimens (p>0.05). significance: this study shows that it is possible to significantly improve metal–porcelain bond strength by applying an overpressure during porcelain firing.

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