Aims: This study aimed to investigate the impact of vertical dimension (VD) on
the activity of masticatory muscles during clenching in complete denture wearers
using electromyography (EMG) Materials and Methods: A group of participants with
complete dentures participated in the study. Three VD conditions were established for
each participant: ideal VD, increased VD (VDO+3mm), and decreased VD (VDO-
3mm). Surface EMG electrodes were placed on the masseter and temporalis muscles
bilaterally. Participants performed standardized clenching tasks at each VD condition,
and EMG data was recorded. Statistical analysis was conducted to assess the influence
of VD on muscle activity. Results: The results revealed significantly lower electrical
activity in both masseter and temporalis muscles at the ideal VD compared to increased
or decreased VD conditions. No significant difference in muscle activity was observed
between VDO+3mm and VDO-3mm conditions. Conclusion: Achieving an accurate
vertical dimension is crucial for maintaining balanced muscle activity during clenching
in complete denture wearers. Deviations from the ideal VD lead to increased activity in
masticatory muscles, potentially contributing to discomfort or fatigue. These findings
highlight the importance of accurate VD determination in complete denture fabrication
for optimal patient comfort and function.