Electromyographic Analysis of Masticatory and Accessory Muscles in Subjects With Implant-Supported Fixed Prostheses: A Three-Arm Comparative Clinical Study

Abstract

This study compares the electromyographic (EMG) activity of the masticatory and accessory muscles in patients with natural teeth and those wearing full-mouth fixed prostheses supported by implants. MethodIn this study, 30 subjects of 30-69 years performed static and dynamic EMG measurements of masticatory and accessory muscles (masseter, anterior temporalis, SCM, and anterior digastric) and were divided into three groups: Group 1 (G1, Control, Dentate), comprising 10 subjects with 14 or more natural teeth (30-51 years of age); Group 2 (G2, single arch implant-supported fixed prosthesis) composed of 10 patients with unilateral edentulism who were successfully rehabilitated with implant-supported fixed prostheses in the maxilla or mandible, restoring occlusion to 12-14 teeth per arch; (39-61 years of age); and Group 3 (G3, full mouth implant-supported fixed prosthesis) with 10 subjects with completely edentulous arches with full mouth implant-supported fixed prosthesis with 12 occluding pairs of teeth (46-69 years of age). The left and right masseter, anterior temporalis, superior sagittal, and anterior digastric muscles were examined at rest, as well as maximum voluntary clenching (MVC), swallowing, and unilateral chewing. On muscle bellies, disposable, pre-gelled silver/silver chloride bipolar surface electrodes were parallel to muscle fibers. BIO-PAKeight® channels recorded electrical muscle activity (Bio-

Skull Biomechanics and Simplified Cephalometric Lines for the Estimation of Muscular Lines of Action

“…Similar differences were found in the Bolton traces (Table 3). Thus, the present mean angle is in good agreement with the self-viewing findings of 45 • by van Eijden et al and about 54 • by Kasai et al Conversely, it differs from the 60-90 • range (mean 70-78 • ) reported in recent magnetic resonance studies [13][14][15]17,[33][34][35][36]. In magnetic resonance testing, muscles are virtually sectioned along several spatial planes and their lines of action are mathematically reconstructed in three spatial dimensions.…”

“…Some authors have stated that asymmetry at rest, during maximal clenching, and during mastication is not statistically significant [23,[28][29][30][31][32]. Farronato et al proposed to investigate changes in temporalis and masseter muscle activity before and after SARPE (Surgically Assisted Rapid Palatal Expansion) in adult patients by measuring electromyographic and electrokinetic activity [33].…”

A Comparative Electromyographic Analysis of Masticatory Muscles Between Skeletal Class II and Skeletal Class I Malocclusion: A Cross-Sectional Study on a Syrian Population

“…Awareness of the causes of malocclusion emphasizes the impact of function on form and justifies the goals of functional orthodontic treatment, which aims to improve the balance of the masticatory muscles and promote the correct development of the facial skeleton. Electromyography provides an objective, non-invasive assessment of the masticatory muscles [10].…”

“…The patient's head was supported on the back of the chair, and based on this, electromyography was performed. The temporalis, masseter, orbicularis, buccinator, mentalis, and digastric muscles were located by palpation [10].…”

“…On the other hand, Custodio and colleagues found an increase in myoelectric activity in a horizontal growth pattern [9]. Ramsundar et al found that the amount of protrusion associated with Class II malocclusion did not affect the extent of muscle activity at rest and during chewing [10]. Cha et al did not find clear differences in the electrical activity of the temporalis and masseter muscles when comparing different growth patterns [11].…”