دراسة مقارنة لتأثير أنظمة التصليب الضوئي على قوة ربط الزيركونيا إلى النسج السنية المحضرة باستخدام الاسمنت الراتنجي ثنائي التصلب
Abstract
يهدف هذا البحث إلى تقييم أثر أنظمة التصليب الضوئي في قوة إلصاق الزيركونيا إلى الأسنان المحضرة عند استخدام الاسمنت الراتنجي ثنائي التصلب, لما لذلك من أهمية في تثبيت الوجوه التجميلية (veneer) .
أجريت هذه الدراسة على 30 رحى بشرية سليمة سحل سطحها الطاحن لجعله مستوياً, ثم ألصق قرص
زيركوني مخزف على السطح الإطباقي المحضر لكل رحى باستخدام الاسمنت الراتنجي ثنائي التصلب
(Variolink II-Ivoclar).
قسمت الأرحاء إلى ثلاث مجموعات (عشرة لكل مجموعة):
صلب الاسمنت في المجموعة الأولى باستخدام ضوء LED عالي الشدة, وفي المجموعة الثانية صلب الاسمنت باستخدام ضوء LED بتقنية Soft Start , أما المجموعة الثالثة صلب الاسمنت فيها باستخدام ضوء Halogen عالي الشدة, ثم خزنت العينات في سائل ملحي بدرجة حرارة 37º ولمدة 7 أيام .
أجري بعد ذلك اختبار القص باستخدام Universal Testing Machine(بسرعة 0.5 مم/دقيقة), وأظهر التحليل الإحصائي للنتائج باستخدام اختبار T-ستيودنت وجود فروق جوهرية في قوة الربط للمجموعات الثلاث لصالح المجموعتين الأولى والثانية, وبالتالي يجب توخي الحذر والدقة في اختيار جهاز التصليب الضوئي المناسب لتصليب الاسمنت الراتنجي ثنائي التصلب عبر الوجوه الزيركونية.
The aim of this research is to evaluate the influence of Light-Cured Systems on adhesion strength of zirconia to prepared teeth by dual-cured cement, because it is an important theme for adhesion veneer.
This study is performed at 30 sound human molars. Their occlusal surfaces were prepared to be flat, then ceramic zirconia disc was cemented to prepared occlusal surface of each molar by dual-cured resin cement (Variolink II-Ivoclar). The molars were divided into three ten-molar groups:
The cement was polymerized by high intensity LED light for group 1. It was polymerized by LED light-soft start method for group 2, and was polymerized by high intensity Halogen light for group 3. Then, the specimens were stored in saline solution at 37ºc for 7 days. After that, shear testing was performed by Universal Testing Machine (rpm 0.5 mm/min).
The statistical analysis of the results by T-test student showed that significant difference was found of Bond Strength among groups. Groups 1 and 2 were the best. Thus, clinician should be careful for accurate light-curing unit selection to polymerize dual-cured resin cement across zirconia veneer.
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