Eman M. Raffat , Ahmed K. Khalifa And Moustafa Abdou Elsyad,

ABSTRACT


Aim: This Study Aimed To Evaluate And Compare The Retention Of Telescopic And Milled Bar Attachments For Four Implant Supported Maxillary Overdenture.

Materials and Methods: An Acrylic Resin Model Of An Edentulous Maxilla Without Alveolar Undercuts Was Fabricated And Four Laboratory Implants Were Inserted In The Canine And Second Premolar Areas. Mucosal Simulation Was Fabricated Over The Model. Maxillary Experimental Overdenture Were Constructed Over The Model And Connected To The Model With Either Telescopic (group I) Or Milled Bar Attachment (group II). The Universal Testing Machine Was Used To Apply Vertically Oriented 4 Points Tensile Loads On A Metal Plate Attached To The Model With 4 Metal Chains Until The Attachments Separated From The Abutments. Maximum Load Needed To Dislodge The Experimental Overdenture From The Maxillary Test Model (retentive Force) Were Calculated. Initial Retentive Forces And Retentive Forces After Repeated Insertions And Removals (540 Cycles) Were Calculated.

Results: Milled Bar Attachment Recorded The Highest Initial And Final Retentive Forces, While Telescopic Attachment Recoded The Lowest One.

Conclusions: Milled Bar Attachment Recorded Significant Higher Retention Compared To Telescopic Attachment.