Aisha Ali Abdo Albahbah, Moustafa Abduo Elsyad And Radwa M.K. Emera,

ABSTRACT


Purpose: This Study Aimed To Evaluate Of Different Degrees Of Lingual Implant Inclination On Retention Of Locator Attachments Used For 2-implant Retained Mandibular Overdentures .

Materials and Methods: Four Identical Acrylic Resin Models Representing A Completely Edentulous Mandibular Ridges Were Used. Each Model Received Two Implants Inserted At Canine Area Bilaterally With Different Degree Of Lingual Inclination. Group I (0,control), Group II (5), Group III (10), And Group IV (20). For Each Degree Of Implant Inclination Retention (vertical Dislodging Forces). The Residual Ridge And The Retromlar Regions For Each Acrylic Resin Model Was Covered By Base Plate Wax To Simulate The Oral Mucosa. Four Acrylic, Metal Reinforced Overdenture Was Fabricated And Connected To The Implants Using Locator Attachments. U Tilizing The Universal Testing Machine, Vertical And 3 Types Of Rotational (anterior, Lateral And Posterior) Dislodgments Were Performed On A Metal Plate Attached To The Model With Metal Chains Until The Attachments Separated From The Abutments. The Initial Retentive Force (maximum Dislodging Force) And Final Retention After 540 Cycles Of Insertions And Removals Were Measured For Each Example. Results : For Initial Retentive Force And Retentive Force After Repeated Insertions And Removals, 0 Degree Inclination Recorded The Highest Retentive Forces, Followed By 5 Degrees, And 10 Degrees (whitout Significant Differences ) And 20 Degree Recoreded The Lowest Retention Values.Locator Transparent Recoreded The Highest Retentive Force, Followed By Locator Nylon Pink, Locator Nylon Blue, Locator Nylon Green, And Locator Nylon Red Recorded The Lowest Retention Values.

Conclusions: For Parallel (0o), And Medium (10o) Inclination, The Highest Initial And Final Retention And Stability Was Noted With Transparent Inserts, Followed By Pink Inserts, And Blue Inserts Showed The Lowest Values. For Slight Inclination (5o), The Highest Initial And Final Retention And Stability Was Noted With Blue Inserts. For Sever Implant (20o) Inclination, The Highest Initial And Final Retention And Stability Was Noted With Transparent Inserts And The Lowest Values Were Noted For Red Inserts.