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The masticatory system is the functional unit composed of the teeth, their supporting structures, the jaws, the temporomandibular joints, the associated muscles, and vascular and nervous systems for these tissues. Mastication is a highly coordinated neuromuscular function involving fast effective movements of the jaw and continuous modulation of force.1 It is an alternating rhythm of isotonic and isometric contractions governed by a central pattern generator located in the brainstem.2 It is characterized by rhythmicity and a diversity of patterns of jaw, tongue and facial movements that vary depending on the species and food ingested.3 Masticatory function is generated by rhythmic contraction of the masticatory muscles. These muscles have the capacity to contract during daily use of the stomatognathic system and maintain muscle tone in mandibular rest position. In older subjects these mechanisms act with marked differences. They have a reduced capacity in various functions of stomatognathic system. Some age related changes, such as deterioration in the fast and slow-twitch fibers of the striated muscles, result in impaired muscle force. Chewing efficiency is reduced when teeth are replaced by complete dentures. The loss of teeth and elimination of Introduction: Mastication is a highly coordinated neuromuscular function involving fast effective movements of the jaw and continuous modulation of force. In older subjects these mechanisms act with marked differences. They have a reduced capacity in various functions of stomatognathic system. Objectives: To evaluate the elevator and depressor muscle activity with and without complete denture prosthesis. Materials and methods: For the purpose of the study 12 patients between the age of 40 and 70 years were selected. Surface electrodes from the electromyographic unit were placed in the region of right and left anterior temporal muscles, Masseter muscle and depressor muscle at the region of anterior belly of digastric and the electromyographic activity was recorded. Results and discussion: The obtained values were subjected to statistical analysis. A paired ttest was performed to determine the difference between the subjects with and without denture prosthesis. Conclusion: The elevator muscles showed higher activity in subjects wearing the denture prosthesis when compared to those without denture prosthesis. No significant change in muscle activity was seen on maximal opening of the depressor muscle between the subjects with and without denture prosthesis.

To Determine the Influence of the Complete Denture Prosthesis on Masticatory Muscle Activity in Elderly Patients: An in vivo Study