تغيرات الانطباق الحفافي للتيجان الخزفية المعدنية المتعلقة بتصميم الحافة العنقية في أثناء دورات خبز الخزف
Abstract
إن التيجان الخزفية المعدنية هي مرممات شائعة تستخدم في التعويضات الثابتة بسبب دقة القلنسوات المعدنية وميزات المقاومة العالية للمعدن والمظهر الجمالي للخزف، لكن تمت ملاحظة تغير الانطباق الحفافي للقلنسوات المعدنية بعد دورة خبز الخزف .
تمت دراسة هذا التغير في الانطباق الحفافي باستخدام نموذجين من الستانلس ستيل لثنية محضرة بخط إنهاء على شكل كتف وآخرعلى شكل شبه كتف. تم تصنيع 20 قلنسوة معدنية، تم تقسيمها إلى10 قلنسوات بكتف
و10 قلنسوات بشبه كتف. تم استخدام خليطة معدنية غير ثمينة wiron99 ( Bego ) وخزف VMK95 Vita) ).
تمت القياسات باستخدام مجهر مزود بكاميرا حيث تصل دقة القياس إلى 0.1 ميكرون .
أظهرت المقارنة خلال دورات الخبز تغيرات أكبر خلال مرحلة إحماء المعدن Degassing.
أظهرت النهاية العنقية بشكل كتف تغيراً حفافياً أقل من شبه الكتف عندما تمت المقارنة من حيث شكل النهاية العنقية للتحضير، حيث تم استخدام تحليل Duncan,s multiple range test الإحصائي.
Metal-ceramic crowns are common restorations used in fixed prosthodontics because of their casting accuracy, the high strength properties of the metal, and the cosmetic appearance of porcelain. However, deterioration of the initial fit of the metal coping has been observed after the porcelain firing cycles.
The study of this change in the marginal fit is achieved using two tooth master models prepared with steel, one with a shoulder margin and the other with a chamfer margin. This represented preparations for metal-ceramic restorations of a maxillary central incisor. Twenty metal copings were fabricated and divided into ten with a shoulder and other ten with a chamfer.
We used nonprecious alloy ( wiron 99, bego Germany ) and ceramic (VMK95-Vita ). Comparisons of the firing cycles revealed a greater change during the degassing stage. The cervical end with a shoulder revealed a marginal fit change less than that with a chamfer when the comparison is occurred depending on the marginal design.
Measurements were made by a microscope with camera ( WM2BV-Germany ). Measurements accuracy at 0.1 micron depending on Duncan,s multiple range test .
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