Amjad A .alfaleeth , Radwa M.K. Emera And Mustafa A. ELsyad,

ABSTRACT


Aim: This Study Aimed To Evaluate And Compare The Effect Of Round Versus Milled Bar Attachments On The Retention Of Implant Supported Maxillary Overdenture.

Materials and Methods: An Acrylic Resin Model Of An Edentulous Maxilla Without Alveolar Undercut Was Fabricated And Four Laboratory Implant Analogs Were Inserted In The Canine And Second Premolar Areas. Mucosal Simulation Was Prepared Over Model. The Implants Were Attached By Bar Attachment. According To The Types Of Bar Attachment Were Classified Into Two Groups: Group I: Round Bar Attachment (Control Group).Group II: Milled Bar Attachment. (Test Group). Maxillary Experimental Overdentures Were Made. The UTM Was Used To Measure Dislodging Forces At The Beginning Of The Study (initial Retention) And After 540 Cycles Of Denture Insertion And Removal (final Retention). Then The Statistical Was Analysis.

Results: The Initial And Final Retention Forces After Repeated Insertion And Removals For Vertical Dislodging Force, Rounded Bar Recorded The Higher Retentive Force Than Milled Bar. Conclusion: Rounded Bar Recorded Significant Higher Retentive Forces Compared To Milled Bar.