Reem Abd El-Moatty Abd El -Monem, Doaa Tawfik Hassan, Ahmed Gamal Ahmed Hassan And Emad Mohamed Tolba M. Agamy,

ABSTRACT
Background: Mandibular Implant-supported Overdentures Solved The Problems Of Retention, Stability And Patient Comfort. In These Cases The Implants May Be Inserted With Angulations That Affect The Choice Of Attachments Used. This Study Aimed To Evaluate Effect Of Implant Angulations On Retention Of Two Stud Attachments For Implant Supported Mandibular Overdenture.

Materials and Methods: Two Implants Were Fixed At Canine Region Bilaterally In A Heat Cured Acrylic Resin Model At (0, 5, 20)?. Ball And Socket Attachment As Well As Locator Were Tested At The Aforementioned Angles. Retention Force Was Measured After Applying Insertion And Removal Cycles Simulating 24 Months Using Universal Testing Machine. The Summed Retentive Values Were Compared Using Paired T Test.

Results: Both Attachments Showed Retention Loss From Initial Values Till End Of Simulation Period, At (0, 5)? Ball And Socket Attachment Showed Higher Mean Retentive Force Values Than Locator, While At 20? Locator Attachment Showed Higher Mean Retentive Force Values. Conclusion: Under The Limitations Of Current Study, It Can Be Concluded That Both Attachments Shows Retention Loss After Simulated Period Of Usage. At (0, 5)? Angles, Ball And Socket Attachment Is More Retentive Than Locator, While At 200 Angle Locator Attachment Is More Retentive Than Ball And Socket.