Occlusal scheme configuration is a key factor in implant prosthodontics success. However, the choice of occlusal scheme for implant assisted prosthesis is broad and controversial. The aim of the present study was to evaluate the effect of two different occlusal concepts on the masticatory muscles activity of completely edentulous patients rehabilitated with implant assisted mandibular overdentures lined with resilient liners. Methods: Twenty completely edentulous male patients with age group of

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... 50-60 years were included. Patients were divided randomly and equally into two groups. Group-I patients received two implant assisted mandibular overdenture and maxillary complete denture with Bilateral Balanced Occlusion (BBO) using semi-anatomic teeth. Group-II patients received two implant assisted mandibular overdenture and maxillary complete denture with Lingualized Occlusion (LO) using semi-anatomic-ortho-lingual teeth. Masseter and Temporalis muscle activities were evaluated using surface Electromyography (sEMG) at insertion, three, six and 12 months of follow-up period. Results: The cumulative implant success rate at the end of follow-up period was 100%. There were no statistical significant differences along the time intervals (P ≥ 0.05) between both groups; however, Group (II) patients revealed improved masticatory muscle activity than that with Group (I) patients. Conclusions: Electromyographic activities of the masseter and temporalis muscles improved in both groups. Lingualized Occlusal scheme coupled with resilient denture liners used for implant assisted overdentures improved the masticatory muscle activity providing better masticatory efficiency and patient comfort.