Evaluating the Impact of Vertical Dimension on Masticatory Muscle Activity during Clenching in Complete Denture Wearers: An Electromyographic (EMG) Analysis

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