مجله دانشکده دندان‌پزشکی اصفهان

مقایسه‌ی میزان گیر روکش‌های سرامیکی زیرکونیوم اکساید در زاویه‌ی تقارب 24 درجه با چهار نوع سمان متفاوت

نوع مقاله : مقاله‌های پژوهشی

چکیده

مقدمه: این مطالعه با هدف مقایسه‌ی میزان گیر روکش‌های سرامیکی زیرکونیوم اکساید، در زاویه‌ی تقارب 24 درجه با چهار نوع سمان متفاوت به انجام رسید. 
مواد و روش‌ها: در این مطالعه‌ی تجربی، 40 دندان پرمولر اول و دوم به روش تصادفی در چهار گروه ده‌تایی تقسیم و پس از آماده‌سازی نمونه‌ها، copingهای زیرکونیا با استفاده از سمان‌های RelyX Ultimate، Panavia F ،Resin modified GI و Zinc phosphate چسبانده و تحت نیروی kg5 قرار گرفتند. سپس تحت ترموسایکلینگ (3000 دور c 55-5) به مدت 24 ساعت در آب با 7 = pH و دمای 37 درجه قرار گرفتند و تحت تست Tensile strength با Electromechanical universal testing machine با سرعت mm/min 0/5 جدا گردیدند، سپس میزان گیر آنها اندازه‌گیری شد. داده‌ها در نرم‌افزار SPSS نسخه‌ی 25 با آزمون‌های کروسکال- والیس و من‌ویتنی مورد تجزیه و تحلیل قرار گرفتند.
یافته‌ها: میانگین و انحراف معیار قدرت گیر در گروه RelyX ultimate 1/13 ± 7/01، در گروه Panavia F 0/37± 4/26، در گروه Resin Modified GI 0/43± 2/72و در گروه Zinc phosphate 0/57± 2/3 مگاپاسکال بود و تفاوت معنی‌دار بین گروه‌ها وجود داشت (0/001 > p value).
نتیجه‌گیری: قدرت گیر روکش‌ها در زاویه‌ی تقارب 24 درجه بر حسب نوع سمان، متفاوت و سمان RelyX Ultimate بالاترین قدرت گیر را داشت. 
کلید واژه‌ها: زیرکونیوم، آماده‌سازی دندان، گیر، سمان‌های دندانی، روکش‌ها.

عنوان مقاله [English]

Comparison of Retention of Zirconium Oxide Ceramic Copings with A 24-Degree Convergence Angle with Four Different Types of Cement

چکیده [English]

Introduction: The aim of this study was to compare the retention of zirconium oxide ceramic copings at a 24 degree convergence angle with four different types of cement.
Materials & Methods: In this experimental study, 40 first and second premolars were  randomly divided into four groups (n = 10). After preparing the specimens, zirconia copings were cemented using RelyX Ultimate, Panavia F, resin-modified GI and zinc phosphate cements under a 5-kg force, followed by thermocycling (3000 rounds 5-55°C) for 24 hours in water with pH = 7 and a temperature of 37°C. Then the copings were separated under a tensile strength in an electromechanical universal testing machine at a strain rate of 0.5 mm/min and their retention was measured. Data were analyzed using SPSS 25 with Kruskal- Wallis and Mann-Whitney tests. 
Results: The means and standard deviations of retention in the RelyX Ultimate, Panavia F, resin-modified GI and zinc phosphate groups were 7.17 ± 1.13, 4.26 ± 0.37, 2.72 ± 0.43 and 2.3 ± 0.57 MPa, respectively, with significant differences between the groups (p value < 0.001).
Conclusion: Based on the results of this study, the retention of ceramic copings of zirconium oxide at a 24-degree convergence angle was different in terms of the cement type, with RelyX Ultimate cement exhibiting the highest retention.
Key words: Crowns, Dental cements, Prosthodontic tooth preparation, Retention, Zirconium.

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مجله دانشکده دندان‌پزشکی اصفهان
دوره 15، شماره 3 - شماره پیاپی 3
مرداد 1398
صفحه 246-256