Ehab Mohmed Abd-Al Halim, Maged Gaber M. El Saadawy And Alaa Bashir Kassem,

ABSTRACT
Background: The Purpose Of This Prospective Study Is To Compare Between Effects Of Two Occlusal Systems On The Biting Force And Masticatory Efficiency Of Implant Bar Retained Mandibular Over Denture Opposed By Maxillary Complete Denture. Methods: After Evaluation Of 10 Completely Edentulous Patients Using Panoramic X-ray, Mucoperiosteal Flaps Were Reflected Exposing The Mandibular Interforaminal Region. Two Implants Were Placed In The Interforaminal Region For Each Of The 10 Patients. After A Healing Period Of 3�months, Acrylic Maxillary And Mandibular Overdentures Were Fabricated With Bilateral Balanced Occlusion For All Patients, Positioner Attachments Were Used And Incorporated Into The Dentures Using Direct Pickup Method. All Patients Used Their Dentures With Bilateral Balanced Occlusion For 1�month As Adaptation Period Then Were Evaluated 3-6-9 Months. Following Evaluation At 9 Months Post Insertion, It Was Converted Into Canine Guidance Occlusion Using The Same Denture. This Was Achieved Clinically By Remounting Using The Semi-adjustable Articulator. Light-cured Composite Resin Was Then Added In The Mandibular Canines To Provide An Interarch Disocclusion Space Of 2�mm During Eccentric Movements.Then Evaluated After3-6-9 Months For The New Occlusion Then Comparing The Results Of Masticatory Efficiency And Biting Force For Both Types Of Occlusion. Results : The Results Of This Study Showed No Significant Difference For The Masticatory Efficiency And Biting Force Between The Occlusal Concepts Proposed.

Conclusions: Both Bilateral Balanced Occlusion And Canine Guidance Occlusion Can Be Used Successfully In Implant-retained Mandibular Overdentures Without Affecting Masticatory Efficiency And Biting Forces.