Swallowing activity of lip muscles in patients with a complete upper and a partial lower denture

Abstract

In 30 partially edentulous subjects provided with an immediate complete upper and a partial lower free-end denture the lip activity in swallowing was studied before and after denture treatment and during a 2-year period of denture wearing. Electromyographic recordings of the right side upper and lower orbicularis oris, mentalis and anterior temporal muscles were obtained during swallowing saliva and during swallowing of water with and without the dentures in the mouth. In the different types of swallows recorded, the lower lip and mentalis muscles showed much stronger activity than the upper lip and anterior temporal muscles and also initiated the swallowing activity. No significant changes in mean voltages of the swallowing activity were observed during the 2-year observation period. On the other hand, the durations of the swallows showed marked increases after 1 year of denture use, when no further rebasings of the complete upper denture had been made.

Surface Electromyographic and Electroglottographic Studies in Normal Subjects Under Two Swallow Conditions: Normal and During the Mendelsohn Manuever

“…We can see that the most frequent occurrence of muscle initiation and termination sequences was the same in both normal swallow and Mendelsohn maneuver. During both normal swallow and the Mendelsohn maneuver, muscle activity of the orbicularis oris inferior most often initiated the muscle sequence as was seen by Tallgren and Tryde [16]. In some instances the submental muscle group was a close second in initiating the muscle sequence as has been seen in other studies [17,19,20].…”

“…The study did not ®nd a signi®cant dierence between activity in orbicularis oris superior and inferior during normal swallow or the Mendelsohn maneuver, contradicting the ®nding of Tallgren and Tryde [16], who found stronger activity in orbicularis oris inferior.…”

“…Variables pertaining to the temporal relationship among the ®ve muscle groups (Fig. 2): (10) time between the onset of orbicularis oris superior and inferior (between points l and 3), (11) time between the onset of orbicularis oris superior and masseter (between points 1 and 5), (12) time between the onset of orbicularis oris superior and submental muscle group (between points 1 and 7), (13) time between the onset of orbicularis oris superior and infrahyoid muscle group (between points 1 and 9), (14) time between the oset of orbicularis oris superior and inferior (between points 2 and 4), (15) time between the oset of orbicularis oris superior and masseter (between points 2 and 6), (16) time between the oset of orbicularis oris superior and submental muscle group (between points 2 and 8), (17) time between oset of orbicularis oris superior and infrahyoid muscle group (between points 2 and 10). The mean for each of these measures across 100 normal and 100 Mendelsohn maneuver swallows was calculated.…”

“…The strap muscles were likely to be involved in the pharyngeal phase of swallow when the hyoid and larynx elevated and returned to rest [1,17,18], although it has been shown that the strap muscles were involved in the oral phase of the swallow as well [19]. One study [16] found that the lower lip initiated the swallow activity. Other studies [17,20] found that submental muscles initiated swallow.…”

“…The orofacial muscles were likely to be involved in the oral phase of swallow when the lips sealed to prevent material from leaking out of the oral cavity [1,16]. The strap muscles were likely to be involved in the pharyngeal phase of swallow when the hyoid and larynx elevated and returned to rest [1,17,18], although it has been shown that the strap muscles were involved in the oral phase of the swallow as well [19].…”