مجله دانشکده دندان‌پزشکی اصفهان

بررسی تأثیر سفیدکننده و جرم‌گیر خانگی بر سختی و زبری سطحی بیس آکریلی پلاک‌های ارتودنسی

نوع مقاله : مقاله‌های پژوهشی

چکیده

مقدمه: استفاده‌ی روزمره از پلاک ارتودنسی در دهان، امکان تجمع میکروب‌ها را افزایش داده و بـا عملکـرد تمیز شدن خود به خود دهان تداخل دارد. هر چند تکنیک‌های مختلفی برای تمیز کردن وسایل ارتودنسی متحرک ارائه شده است، اما در مورد استفاده از روشی ایمن که خصوصیات فیزیکی دستگاه را حفظ کند، اتفاق نظر وجود ندارد. هدف از انجام این پژوهش، بررسی تأثیر استفاده از اسید هیدروکلریک 10 درصد (جهت برداشتن رسوبات کانی) و هیپوکلریت سدیم 5/25 درصد (جهت حذف مواد آلی و تغییر رنگ‌ها) بر روی سختی و زبری سطحی آکریل پلاک‌های متحرک ارتودنسی بود.
مواد و روش‌ها: ااین مطالعه‌ی مقطعی- آزمایشگاهی در دانشگاه‌های علوم پزشکی و صنعتی اصفهان انجام شد. در این مطالعه با استفاده از آکریل‌های خود سخت‌شونده‌ی ارتوکریل و آکروپارس، 80 قطعه‌ی آکریلی به ابعاد 3 × 10 × 12 میلی‌متر تهیه شد. سپس هر کدام به طور تصادفی به 4 گروه 20تایی تقسیم شدند.گروه اول شامل 15 دقیقه مغروق‌سازی در هیپوکلریت سدیم و 15 دقیقه در هیدروکلریک اسید،گروه دوم شامل دو بار فرایند مشابه گروه اول، گروه سوم شامل سه بار فرایند مشابه گروه اول و گروه چهارم یا شاهد، بدون مغروق‌سازی می‌باشد. سپس زبری سطحی و سختی نمونه‌ها مورد سنجش قرار گرفت. برای تجزیه و تحلیل داده‌ها، از آزمون Two-Way ANOVA و در سطح معنی‌داری 0/05 استفاده شد.
یافته‌ها: دفعات مغروق‌سازی، تأثیر معنی‌داری بر سختی (0/958 = p value) و زبری سطحی (0/657 = p value)گروه‌های مختلف نداشت. سختی سطح بین دو نوع آکریل تفاوت معنی‌داری نداشت (0/077 = p value) ولی زبری سطحی گروه‌های آکروپارس به میزان معنی‌داری بالاتر از ارتوکریل بود (0/001 > p value).
نتیجه‌گیری: 15 دقیقه مغروق‌سازی در اسید هیدروکلریک 10 درصد و متعاقب آن 15 دقیقه هیپوکلریت سدیم 5/25 درصد و 3 بار تکرار این فرایند اثر معنی‌داری بر سختی و زبری سطحی آکریل خود سخت‌شونده‌ی ارتودنسی نداشت.
کلید واژه‌ها: پلاک ارتودنسی، اسید هیدروکلریک، هیپوکلریت سدیم، سختی.

عنوان مقاله [English]

The Effect of Bleach Liquid and Household Cleaner on Surface Hardness and Roughness of Acrylic Base of Orthodontic Appliances

چکیده [English]

Introduction: The daily use of orthodontic removable plates can interfere with the self-cleansing function of the mouth. Although various techniques have been proposed for cleaning removable orthodontic appliances, there is no consensus on the use of a safe method that preserves the physical properties of the appliance. This study aimed to investigate the effect of using hydrochloric acid (10%, for removal of mineral deposits) and sodium hypochlorite (5.25%, to remove organic matter and discolorations) on surface hardness and roughness of self-cure orthodontic acrylic resins.
Methods and Materials: This cross-sectional laboratory study was conducted in the fall of 2017 at Isfahan University of Medical science and Isfahan University of Technology. In this study two orthodontic acrylic resins (Orthocryl® and Acropars®) were used. Eighty samples (12×10×3 mm) from each one were fabricated and divided into four groups (n = 20). Group 1: 15 minutes immersion in household cleaner liquid (Hydrochloric acid, 10%) followed by15 minutes immersion in household bleach liquid (Sodium Hypochlorite, 5.25%). In group 2, immersions were repeated just like group two times and in group 3, were done three times. Group 4 was as control and had no immersion. The surface hardness and roughness of samples were measured. Data were analyzed with Two-Way ANOVA and the significance level was set at 0.05.
Results: The number of immersion procedures did not significantly affect the surface hardness (p value = 0.958) and surface roughness (p value = 0.657) in the different study groups. There was no significant difference in the surface hardness between the two acrylic resin brands (p value = 0.077); however, Acropars acrylic resin samples exhibited significantly higher surface roughness compared to the Orthocryl acrylic resin samples(p value < 0.001).
Conclusion: 15 minutes of immersion in 10% HCl, followed by 15 minutes of immersion in 5.25% NaOCl and repetition of the procedure three times did not significantly affect the surface hardness and roughness of self-cured acrylic resins.
Keywords: Orthodontic appliances, Hydrochloric acid, Sodium hypochlorite, Hardness.

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مجله دانشکده دندان‌پزشکی اصفهان
دوره 17، شماره 2 - شماره پیاپی 2
تیر 1400
صفحه 129-136