Electromyographic evaluation of masseter and anterior temporalis muscles in rest position of edentulous patients with temporomandibular disorders, before and after using complete dentures with sliding plates.
OBJECTIVE
This study was performed with the purpose of investigating electromyographic (EMG) activity of the anterior temporalis and masseter muscles in edentulous individuals with temporomandibular disorder (TMD), before and after using sliding plates on complete dentures in the mandibular rest position.


BACKGROUND
Edentulous patients may present TMD, which is characterised by pain in temporomandibular joints, masticatory and neck muscles, uncoordinated and limited mandible movements, joint sounds and an altered occlusal relationship. It is imperative to offer treatment in order to re-establish stomatognathic system structures before submitting the individual to any definitive restorative treatment.


METHODS
The patients were edentulous for at least 10 years. EMG recordings were made before the insertion of the dentures (0 months) and also after using the sliding plates at the fourth month, 9th month and 12th month, using computerised electromyography K6-I/ EMG Light Channel Surface. EMG evaluations of the muscles were performed under the following clinical conditions: rest position with dentures (R1), rest position without dentures (R2), rest position with dentures post-activity (chewing) (R3), rest position without dentures post-activity (chewing) (R4).


RESULTS
All patients obtained remission of muscular fatigue and reduced pain in stomatognathic system structures. Temporalis muscle showed significant increase in EMG activity compared with initial values (p < 0.01). Masseter muscles showed significantly lower mean values (p < 0.01) compared with initial values.


CONCLUSIONS
The sliding plates allowed the process of neuromuscular deprogramming, contributing to muscular balance of the masticatory system, and are therefore indicated to be used before the fabrication of definitive complete dentures in patients with TMD.
Zuccolotto
Maria Cristina Candelas
MC
Discipline of Complete Denture Prosthetics and Occlusion, School of Dentistry, University of Ribeirão Preto (UNAERP), Brazil.
Vitti
Mathias
M
Nóbilo
Krunislave Antônio
KA
Regalo
Simone Cecílio Hallak
SC
Siéssere
Selma
S
Bataglion
César
C
D000368:Aged; D016302:Centric Relation; D003819:Denture Bases; D003779:Denture Design; D003824:Denture, Complete; D004576:Electromyography; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007574:Jaw Relation Record; D008297:Male; D008406:Masseter Muscle / Q000503:physiopathology*; D008875:Middle Aged; D009066:Mouth, Edentulous / Q000150:complications* / Q000503:physiopathology / Q000534:rehabilitation; D013703:Temporal Muscle / Q000503:physiopathology*; D013705:Temporomandibular Joint Disorders / Q000150:complications / Q000503:physiopathology / Q000628:therapy*; D016896:Treatment Outcome