Effect of occlusal splints on the electromyographic activities of masseter and temporal muscles during maximum clenching. 2007

Omid Savabi, and Farahnaz Nejatidanesh, and Saeed Khosravi
Department of Prosthodontics, School of Dentistry, Esfahan University of Medical Sciences, Esfahan, Israel. savabi@hotmail.com

OBJECTIVE Despite the broad use of occlusal splints in the treatment of temporomandibular disorders, the efficacy of splints is a source of controversy. In this study, the effectiveness of occlusal splints on the electromyographic activity of the masseter and temporal muscles in healthy individuals was investigated. METHODS An occlusal splint was made for 25 healthy individuals. Surface electromyographic recordings were done during maximum clenching without the splint and immediately after application of the splint. The relative level of activity in the masseter and temporal muscles was quantified by means of activity index. Paired t test and Wilcoxon signed-rank tests were used for data analysis. RESULTS The mean electromyographic activities of masseter and temporal muscles (in mV/s) were 0.7712 and 1.0488 without the splint and 0.8396 and 0.9276 immediately after application of the splint. There was no significant difference between the electromyographic activities of both muscles before and after insertion of the splints. The activity index increased after application of the occlusal splints. This increase was also insignificant. CONCLUSIONS Immediate application of occlusal splints has no significant effect on the activity of masseter and temporal muscles. It could decrease the relative activity of the temporal to the masseter muscle (increasing the activity index).

UI MeSH Term Description Entries
D008297 Male Males
D008406 Masseter Muscle A masticatory muscle whose action is closing the jaws. Masseter Muscles,Muscle, Masseter,Muscles, Masseter
D001732 Bite Force The force applied by the masticatory muscles in dental occlusion. Masticatory Force,Occlusal Force,Bite Forces,Force, Bite,Force, Masticatory,Force, Occlusal,Forces, Bite,Forces, Masticatory,Forces, Occlusal,Masticatory Forces,Occlusal Forces
D004576 Electromyography Recording of the changes in electric potential of muscle by means of surface or needle electrodes. Electromyogram,Surface Electromyography,Electromyograms,Electromyographies,Electromyographies, Surface,Electromyography, Surface,Surface Electromyographies
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D013703 Temporal Muscle A masticatory muscle whose action is closing the jaws; its posterior portion retracts the mandible. Muscle, Temporal,Muscles, Temporal,Temporal Muscles
D017090 Occlusal Splints Rigid or flexible appliances that overlay the occlusal surfaces of the teeth. They are used to treat OBSTRUCTIVE SLEEP APNEA, clenching, BRUXISM, and their sequelae, and to provide temporary relief from muscle or temporomandibular joint pain. Dental Night Guard,Mandibular Advancement Devices,Mandibular Advancement Splints,Splints, Occlusal,Advancement Device, Mandibular,Advancement Devices, Mandibular,Advancement Splint, Mandibular,Advancement Splints, Mandibular,Dental Night Guards,Device, Mandibular Advancement,Devices, Mandibular Advancement,Guard, Dental Night,Guards, Dental Night,Mandibular Advancement Device,Mandibular Advancement Splint,Night Guard, Dental,Night Guards, Dental,Occlusal Splint,Splint, Mandibular Advancement,Splint, Occlusal,Splints, Mandibular Advancement
D018709 Statistics, Nonparametric A class of statistical methods applicable to a large set of probability distributions used to test for correlation, location, independence, etc. In most nonparametric statistical tests, the original scores or observations are replaced by another variable containing less information. An important class of nonparametric tests employs the ordinal properties of the data. Another class of tests uses information about whether an observation is above or below some fixed value such as the median, and a third class is based on the frequency of the occurrence of runs in the data. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed, p1284; Corsini, Concise Encyclopedia of Psychology, 1987, p764-5) Kolmogorov-Smirnov Test,Kruskal-Wallis H Statistic,Mann-Whitney U Test,Rank-Sum Tests,Spearman Rank Correlation Coefficient,Wilcox Test,Wilcoxon Rank Test,Non-Parametric Statistics,Nonparametric Statistics,Statistics, Non-Parametric,Kolmogorov Smirnov Test,Mann Whitney U Test,Non Parametric Statistics,Rank Sum Tests,Rank Test, Wilcoxon,Rank-Sum Test,Statistics, Non Parametric,Test, Kolmogorov-Smirnov,Test, Mann-Whitney U,Test, Rank-Sum,Test, Wilcox,Test, Wilcoxon Rank,Tests, Rank-Sum,U Test, Mann-Whitney

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