Aim: to evaluate effect of different schemes of occlusion; bilateral balanced 
occlusion (BBO) and lingualized occlusion (LO) of conventional and digital 
(3D printing) complete dentures on masticatory performance (efficiency). 
Subjects and Methods: Ten completely edentulous patients were selected randomly. 
Then received a complete conventional and digital (3D printing) denture with BBO. 
After three months, all patients were recalled for recording mean values of masticatory 
efficiency that was evaluated by assessing the chewing time and number of strokes 
until first swallow and until clearance of the mouth from food using different types 
of food (carrot, apple and banana). The occlusal schemes were interchanged to LO 
schemes on the patients' denture bases, reinserted in the mouth with resting period 
three weeks between occlusal schemes. Then, masticatory efficiency measurements 
were recorded as mentioned before. One way ANOVA was used for comparison of 
the different dentures followed by Tukey HSD post hoc test used to compare between 
every two dentures. The significance level was set at P-value ≤ 0.05. Statistical 
analysis was performed using IBM® SPSS® Statistics Version 20 for Windows. 
Results: The results showed no significant difference in masticatory performance 
between different occlusal schemes or between conventional and 3D printing dentures 
and the patients were satisfied by the masticatory function when eating different types 
of food. Conclusion: BBO as LO penetrated the food polus well and provide more 
stability and favorable stress distribution in parafunctional and excursive movements. 
However, 3D printing dentures with BBO were somewhat better than other dentures