بررسی اثر پخت‌های مکرر بر روی رنگ نمونه‌های لیتیوم دی‌سیلیکات با دو سطح متفاوت ترانسلوسنسی: یک مطالعه‌ی آزمایشگاهی

نوع مقاله : مقاله‌های پژوهشی

چکیده

مقدمه: افزایش انتظارات بیماران نسبت به درمان‌های ترمیمی- زیبایی، پژوهشگران را تشویق به مطالعه‌ی بیشتر در زمینه‌ی مواد و روش‌هایی که ظاهری مطلوب را برای بیماران فراهم می‌کند، نموده است. هدف از این مطالعه، ارزیابی اثر پخت‌های مکرر بر رنگ گلاس ‌سرامیک لیتیوم دی‌سیلیکات با ترانسلوسنسی‌های متفاوت بوده است.
مواد و روش‌ها: در این مطالعه‌ی آزمایشگاهی، بیست نمونه از گلاس ‌سرامیک‌های لیتیوم دی‌سیلیکات (IPS e. Max CAD) با ترانسلوسنسی زیاد و کم در دو گروه تهیه شد (10 = n). نمونه‌ها به شکل مستطیل در ابعاد 12×14×1 میلی‌متر برش داده شدند. سپس نمونه‌ها سه ‌مرتبه پخت و بعد از پخت اول و سوم با استفاده از اسپکتروفتومتر، مختصات تعیین‌کننده‌ی رنگ اندازه‌گیری شد. بین پخت اول و سوم محاسبه شد. اطلاعات با استفاده از نرم‌افزار  SPSSنسخه‌ی 16 و آزمون تی‌مستقل تجزیه و تحلیل شدند (α = 0/05).
یافته‌ها: تغییر رنگ ناشی از سه پخت در نمونه‌های لیتیوم دی‌سیلیکات با ترانسلوسنسی کم (0/88 ± 1/342) و ترانسلوسنسی زیاد (0/40 ± 0/757) به دست آمد. میانگین تفاوت رنگ لیتیوم دی‌سیلیکات با ترانسلوسنسی کم نسبت به نوع با ترانسلوسنسی زیاد، تحت تأثیر پخت‌های مکرر قرار گرفت (p value < 0/05).
نتیجه‌گیری: سیکل‌های پخت متعدد، تغییر رنگ بیشتری در لیتیوم دی‌سیلیکات با ترانسلوسنسی کم نسبت به نوع با ترانسلوسنسی زیاد ایجاد می‌کند.
کلید واژه‌ها: رنگ، سرامیک، ترمیم دندانی، CAD/CAM

عنوان مقاله [English]

Effect of Repeated Firing on the Color Changes of Lithium Di-silicate with High and Low Translucency: An In-vitro Study

چکیده [English]

Introduction: Increasing patients' expectations about restorative therapies and the beauty of researchers encourages researchers to study more about materials and methods that have the desired appearance for patient satisfaction. The purpose of this study was to evaluate theeffect of repeated firing on color changes of lithium disilicate (with high and low translucency).
Materials and Methods: In this in-vitro study, 20 samples of high and low lithium disilicate were prepared forboth groups (n = 10). Samples were sectioned and polished to provide a thickness of 1mm. The specimens were subjected to firing for three times. The color coordinationafter the first and second firing were measured using spectrophotometer. Delta E was calculated between first and second firing.the data were analyzed by SPSS (version 16) stastical software (α = 0.05).
Results: The mean and standard deviation of low translucency was 1.342 ± 0.88 and high transcendental was 0.757 ± 0.49.Pair- wise comparison of color change prepared by three  times firing in lithium dicliate samples caused higher ΔE of LDS with low translucent significantly (p value = 0.019).
Conclusions: Multiple firing casued significantly higher color changes in lithium disilicate with low translucency than that of with high translucent.
Key Words: Color, Ceramics, Dental restoration, CAD/CAM

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