Title: 0386 - Electromyographic Changes in Patients With Bruxism After Using Occlusal Splint
Fernando Angeles-Medina (Presenter)
Universityersidad Nacional Autonoma de Mexico
Julio Morales, Universityersidad Nacional Autonoma de Mexico
Luis Cruz-Hervert, Instituto Nacional de Salud Pública
David Elias Vinas, Universityersidad Nacional Autonoma de Mexico
Nicolas Pacheco-Guerrero, Universityersidad Nacional Autonoma de Mexico
Objectives: Some authors suggest that sings and symptoms decreased after one month of using the occlusal splint. However, there is no evidence related to electromyographical changes after one month of oclusal splint treatmet and the time that oclusal splint is worn in patients with bruxism remains unclear. The aim of this study is to evaluate the differences of Root Mean Square activity in Masseters after one month of using oclusal splint.
Methods: We performed a cohort study and measured bilateral electromyographic activity (EMG) of masseter muscles for 30 seconds in maximum intercuspation. We measured EMG in three times: 1) at basal time without oclusal splint; 2) basal time with oclusal splint, and, 3) after one month. EMG activity was measured by using a digital electromyograph, developed by our group (Hardware and software) to determine µV every 0.001 seconds and root medium square (RMS) values were recorded. Patients were treated at the Department and Physiology Laboratory in the UNAM in 2017. We performed a descriptive, bivariate analysis and a random effects linear regression model for repeated measurements adjusted by confounders.
Results: We analyzed the information of 60 adult patients, aged between 20 to 55 years old. 66.0% of participants were female. As result of the multivariate analysis we were not able to indetified statistical differences of EMG activity in basal time using oclusal splint (Regression coeficiente [Coef] -14.27 µV; 95% Confidence interval [95%CI -45.98; 17.44; p=0.372] and after one month of oclusal splint treatment (Coef. -19.83 µV; 95%CI -49.49-8.51; p=0.163), when compared to basal time without using oclusal splint.
Conclusions: EMG in patients with bruxism there were no difference after one month of oclusal splint. According to our results, we suggest to increase over one month period the time of oclusal splint teraphy, in order to be able to indentify EMG changes in masseters.
This abstract is based on research that was funded entirely or partially by an outside source:
This work was supported by the Support Program for Research Projects and Technological Innovation (PAPIIT) of National Autonomous University of Mexico (No. IT201817-DGAPA). The funding agencies did not participate in the study design; in the collection, analysis and interpretation of data; in the writing of the report; and in the decision to submit the article for publication.
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: This work was supported by the Support Program for Research Projects and Technological Innovation (PAPIIT) of National Autonomous University of Mexico (No. IT201817-DGAPA). The funding agencies did not participate in the study design; in the collection, analysis and interpretation of data; in the writing of the report; and in the decision to submit the article for publication.