کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6053539 1197053 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Quantitative phase analysis from X-ray diffraction in Y-TZP dental ceramics: A critical evaluation
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی دندانپزشکی، جراحی دهان و پزشکی
پیش نمایش صفحه اول مقاله
Quantitative phase analysis from X-ray diffraction in Y-TZP dental ceramics: A critical evaluation
چکیده انگلیسی

The dentistry literature shows consensus to use the Garvie and Nicholson equation modified by Toraya to quantify the Y-TZP phase transformation. However, this method does not include the possibility of cubic phase transformation and crystallographic texture after artificial ageing, and in this case, it is possible to observe errors of quantification.ObjectivesThe aim of this study was to evaluate a dental Y-TZP ageing kinetic of phase transformation under pressure and hydrothermal conditions (130° C, 2 bar) and to compare the methods of quantification by the equation of Garvie and Nicholson modified by Toraya and the Rietveld refinement method.MethodsDiscs of Y-TZP (12 mm Ø × 1.2 mm in height) were divided into groups (n = 4) according to the ageing times (in the range of 6 and 138 h). The superficial characterisation was made using SEM and the XDR for crystallographic analysis.ResultsAn aggressive superficial degradation process at the beginning of phase transformation in 6-10 h of ageing was observed by SEM. The phase transformation quantification showed differences between the methods. It was observed the increase and stabilisation of monoclinic phase until 80% at 40 h of ageing by the Garvie and Nicholson modified by Toraya equation, compared to 60% of monoclinic phase and approximately 30% of cubic phase observed by the Rietveld method.ConclusionThe Toraya equation showed an overestimated result of monoclinic quantification compared to the Rietveld method.Clinical significanceThe overestimated result of monoclinic phase could lead to different interpretation about the dental Y-TZP ageing process.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dentistry - Volume 42, Issue 11, November 2014, Pages 1487-1494
نویسندگان
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