Omar Samy Mahmoud <br/><br/>
The change in retentive values of O - ring and magnetic attachments in mandibular implant supported overdentures over periods of time :   An in vitro study /  
 والوصلات  المغناطيسية فى الاطقم المحملة على زرعات فى الفك السفلى مع مرور الوقت''O- ring''التغير فى قيم الاستبقاء فى الوصلات المرنة    
Omar Samy Mahmoud ; Supervised Hamdy Aboelfoutoh , Ehab Aboelros 
 - Cairo :   Omar Samy Mahmoud ,   2012 
 - 88 Leaves :   charts , facsimiles ;   30cm 
<br/><br/>Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Prosthodontics 
<br/><br/> The aim of this study is to evaluate and compare the change in the retentive values caused by repetitive cycles of insertion and removal of mandibular implant - supported over - dentures retained by O - ring (ball and socket) and magnetic attachments over periods of time . Results : O - ring attachments showed high but unstable retention values with statistically significant but a very stable retention values with statistically insignificant changes from the beginning of the study till the last cycle 
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<br/><br/><label>Subjects--Index Terms: </label>Magnets O-ring  Overdenture