الفهرس 
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Abstract
Objective :to provide within subjects clinical evaluation of the effect of implant number and location on the magnitude of force required to dislodge mandibular overdenture and the bite force clinically in the lateral incisors, canine areas and both Material and methods : six completely edentulous patients were selected for this study. Each patient received two implants in the lateral incisors and the other two implants were installed in the canine areas bilaterally. The bite force and clinical retention were measured with conventional denture and after one week of denture insertion and 6 months in lateral incisors, canine areas and both. Results :There was a significant difference between conventional complete dentures and overdentures regarding retention and bite force. For T0, the highest retention forces were noted with 4 implant overdentures, followed by 2 canine implant overdentures followed by 2 lateral incisor implant overdentures and the lowest retention was noted with conventional complete denture. For T0, the highest bite forces were noted with 4 implant overdentures, followed by 2 canine implant overdentures followed by 2 lateral incisor implant overdentures and the lowest was noted with conventional complete denture. Conclusion : Implant-retained prosthesis was a better alternative to the conventional complete denture regarding retention and bite force. The four-implant supported overdenture was the best regarding retention and bite force initially and after six months. The most favorable position of two implants retaining mandibular overdenture regarding retention was canine position as it was associated with increased initial and six months clinical retention. In two implants overdenture, the bite force was not affected by implant position.