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Romanian Journal of Oral Rehabilitation 2012,Numarul 3 Orbicularis Oris Muscle Electromyographic Activity In Three Functional Conditions Before And After The Insertion Of Complete Dentures

Orbicularis Oris Muscle Electromyographic Activity In Three Functional Conditions Before And After The Insertion Of Complete Dentures

Sorin Popșor, Claudia Șoaita

The aim of this paper is to assess the changes in clinical and electromyographic activity of orbicularis oris muscle (OO) in complete edentulous patients before and after the insertion of dentures in three essential functional conditions. Material and method Seven patients were included in this study. Electromyographic records of the upper(OOS) and lower(OOI) orbicularis oris muscle were made using the BioEMG II (Bioresearch Assoc. Inc.) surface electromyography device, performed at rest, while whistling and sucking before and 3 days after the insertion of the complete dentures. Results There was a significant difference between OOS and OOI activity before inserting dentures in all three conditions (p =0.0156) as well as after the prosthesis insertion during sucking and whistling, a more pronounced activity of OOI being obvious. No statistically significant difference in the activity of the mentioned muscle groups before and after insertion of the dentures, in the three recording conditions was observed. Conclusion Within the limits of the present study, we conclude that in terms of EMG at rest as well as during functional moments of sucking or whistling there are no significant changes in OOI and OOS muscle tone, before and after conventional prosthetic treatment of complete edentation.

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