مقارنة مقاومة قوى القص للحاصرات المعدنية المعاد إلصاقها بعد تحضير قاعدتها بطريقة ميكانيكة(دراسة مخبرية)
Abstract
تهدف هذه الدراسة الى مقارنة مخبريةلقوى القص للحاصرات المعدنية المعاد الصاقها بعد تحضير سطحها بطريقة ميكانيكية. العينة مكونة من 40 ضاحك أول مقلوع حيث تم تقسيمها عشوائيا إلى مجموعتين كل منهما 20 سن بعد ذلك تمت إزالةالكومبوزيت المتبقي على سطح السن وقاعدة الحاصرة بواسطة تنغستينكاربايدوإعادة إلصاقها ومن ثم تم تقييم قوى القص للحاصرات المعاد إلصاقها لنفس العينة بواسطة جهاز KN)6)tecnotestبسرعة 1مم/دقيقة أظهرت النتائج أن متوسط قيمة قوى القص بالنسبة للكومبوزيتReselience كانت (19.25)ميغا باسكال بينما كان متوسط قوى القص للكومبوزيتHeliosit (10.25),كما وجدنا ان متوسط قيمة قوى القص عند إعادة الإلصاق بالنسبة للكومبوزيتReselience كانت (13.70) وكانت بالنسبة للكومبوزيتHeliosit (7.95) حيث أظهر اختبار تي ستيودنت وجود علاقة هامة احصائيا بين الالصاق الأولي وإعادة الإلصاق. كما لاحظنا ان هناك فروقات ذات دلالة إحصائية بين قوى الإلصاق الأولي وإعادة الإلصاق بالنسبة للكومبوزيتReselience,بينما لم نجد فروقات ذات دلالة إحصائية بين قوى الإلصاق الأولي وإعادة الإلصاق بالنسبة للكومبوزيتHeliosit. The aim of this study To compare in vitro shear bond strength (SBS) of different orthodontic adhesives in and rebonding metal brackets after preparing their bases mechanically. Material and methods:Sample consisted of 40 extracted first premolars, randomly divided into two groups (n=20),.Adhesive removed by tungsten carbide bur later the brackets were rebonded. The tests were performed in a tecnotest (6kN) SBS testing machine, at a speed of 1 mm/min. It was found that the mean shear bond strength of Reseliencewas 19.25 MPa and that of Heliosit orthodontic was 10.25MPa.We foundthat the mean shear bond strength of rebonding forReselience was 13.70 and 7.95 forHeliosit.The t-test revealed that there was a significant difference between the shear bond strength of the two groups. We found a significant difference between bonding and rebondingfor Reselience,while there was no significant difference between bonding and rebonding for Heliosit.Downloads
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