Omar Hashem Kamal Mohamed,  <br/><br/>
Retention of mandibular implant supported overdentures using CM-LOC and locator attachment systems :   A randomized in vitro study / 
 استبقاء الاطقم الكاملة المدعومة بغرسات فى الفك السفلى باستخدام  Locator و CM-LOC من الوصلات المستخدمة لاستبقاء دراسة معملية   
by Omar Hashem Kamal Mohamed ; Supervisor Dr. Nouran Abd Al Naby, Dr. Nada Sherin El Khourazaty.  
 - 101 pages :   illustrations ;   25 cm. +   CD. 
<br/><br/>Thesis (M.Sc.)-Cairo University, 2020. 
<br/><br/>Bibliography: pages 86-100. 
<br/><br/> Aim: Implant supported overdentures have proved to be a better treatment option compared to <br/>conventional dentures in treating edentulous jaws. The present study was carried out to compare the <br/>retention of two different types of attachments used to retain single implant supported mandibular <br/>overdenture using universal testing machine after mechanical aging that was done by chewing simulator. <br/>The two attachments used in this study were Locator and Cendres and Meteaux Locator (CM-LOC). <br/><br/> <br/><br/>Methodology: Ten epoxy resin models of completely edentulous mandible were constructed and <br/>prepared to receive a single implant in the midline area. Ten overdentures were constructed with steel <br/>rods fixed to the denture using auto polymerized acrylic resin at the geometric center, two attachment <br/>systems; Locator attachmrent with nylon matrix and Cendres &Meteaux Locator (CM-LOC) with a <br/>PEKK matrix were investigated, with each type of attachment, the pickup procedure consisted of <br/>attaching matrix to the fitting surface of the denture with self-cure acrylic resin. All of the overdentures <br/>were subjected to different chewing cycles 500 cycles = (3 month), 1000 cycles = (6 month), 1500 <br/>cycles = (9 month) and 2000 cycles = (12 month) , then retention was evaluated using universal testing <br/>machine.. <br/>Results: The Locator attachment have shown a decrease in retention when subjected to different <br/>chewing cycles (p=0.001), with pairwise comparison showing a statistically significant difference <br/>between baseline and 2000 cycles ( p=0.011), between 500 cycle and 2000 cycle ( p=0.024). <br/>While for the CM-LOC group there was a decrease in retention when subjected to 500, 1000, 1500 <br/>cylces ( p=0.001), and with a slight increase in retention after 2000 cycles. With pairwise comparisons <br/>there was statistically significant difference at 500 cycles = 3 month and 1500 cycles (9 month). <br/>Conclusion: Within in limitation of the present study in vitro study it can be concluded that both the <br/>Locator and CM-LOC attachment have shown acceptable retention values to support single implant <br/>mandibular retained overdentures. However both attachments have shown a decrease in retention when <br/>subjected to different chewing cycles , The CM-LOC attachment has shown significant better retention <br/>when compared to Locator attachment after 500 cycles .   اجريت هذه الرسالة لمقارنة القدرة الاحتياطية لنوعين مختلفين من الملحقات المستخدمة للاحتفاظ في الاطقم المدعومة بالزرعة الواحدة بواسطة ألة اختبار علمية بعد التقدم الميكانيكي الذي تم بواسطة جهاز محاكاة المضغ.<br/>بينما كانت مجموعة التدخل هي مجموعة CM-LOC  وكانت مجموعة التحكم هيLOCATOR <br/>تم بناء نموذج ايبوكسي للفك السفلي عديم الاسنان تماماً وتجهيزه لتلقي زرعة واحدة في منطقة خط الوسط. تم بناء عشرة أطقم مفردة خمسة تحتوي على مصفوفة من النايلون وخمسة أخرى تحتوي على مصفوفة من PEEK<br/>ثم يتم قياس قيم الاحتفاظ عند خط الاساس باستخدام ألة اختبارعالمية ثم تعرضت الأطقم في كل مجموعة لدورات مضغ مختلفة 500 و 1000 و 1500 و 2000 دورة. تم قياس الاستبقاء طوال هذه الدورات لكلا المجموعتين. 
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<br/><br/><br/>Text in English and abstract in Arabic & English. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Prosthodontics<br/>الاستعاضه الصناعية
<br/><br/><label>Subjects--Index Terms: </label>Retention Of Mandibular Implant    Supported Overdentures  CM-LOC And Locator   Attachment Systems  
<br/><br/><label>Dewey Class. No.: </label>617.69