Purpose : the present study was assess the outcome of different occlusal concepts which are balanced occlusion and canine guided occlusion on the masticatory efficiency of muscles of mastication in implant supported mandibular overdentures wearers. Material and method: Ten totally edentulous patients were chosen for this study, aged 50 to 60 years old. All patients free from any systematic dieses. The patients were divided according to the treatment protocol into two groups; all patients wore denture with intra oral adjustment as a control group, (GI) five patients wore denture with bilateral balanced occlusion and (GII) five patients wore denture with canine guided occlusion. All patients were submitted to masticatory efficiency test, after one month by using different textures of foods. All data selected during the study were evaluated using ANOVA followed by Tukey's post hoc test using LSD test. P< 0.05 was considered statistically significant. Results: with soft food, there was no significant difference among the three groups, while for chewing hard type of food; the greatest mean was recorded in occlusion after oral adjustment, whereas the lowest mean was recorded in bilateral balanced occlusion. Conclusion: The two groups selected in the study, bilateral balanced occlusion as balanced concept and as a non-balanced concept canine guided occlusion both can be considered for usage effectively in implant retained overdentures without disturbing chewing efficiency.