الفهرس 
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Abstract
The aim of this within patient study was to evaluate the influence of number and distribution of implants used to assist mandibular complete overdenture on patient’s maximum biting force and masticatory efficiency. Materials and Methods: Six completely edentulous healthy patients were included in the study. Each patient received a conventional complete denture before implant surgery was performed in the canine and premolar areas bilaterally. After healing period, the conventional denture was converted into implant supported overdenture using locator attachment and checked for biteforce at insertion, 3 and 6 months later by forcemeter and masticatory efficiency was evaluated at insertion, 3 and 6 months later by two-colored chewing gum. Repeated Measures ANOVA test was used to compare more than 2 studied periods with post Hoc test Tukey test. Two- & three-Way ANOVA tests were used to assess the effect of combination of 2 or 3 independent factors on continuous parametric outcome (biteforce and chewing efficiency). Results: There was a significant difference in bite force and chewing efficiency between groups at different observation times (immediately after insertion of mandibular overdenture and after 3, 6 months). group III recorded the highest bite force followed by group II, and group I showed the lowest bite force. For all Groups. The highest unmixed fraction (UF) was observed with group I, followed by group II and the lowest UF was noted with group III. Conclusion: Regardless the implant number and location, implant-retained mandibular overdenture significantly increased the bite force and masticatory efficiency compared with the conventional complete denture. The four implants located in the canine and premolar areas supported a mandibular overdenture significantly increased the clinical bite force and masticatory efficiency compared with only two implants in the canine areas or premolar areas. The implant location when only two implants used to retain mandibular overdenture has no impact on the bite force after six months of denture insertion. The mechanical retention value of locator attachment must be maintained by replacement of retention insert if necessary, to confirm high biting force and masticatory efficiency.