Lee SJ, McCall WD, Jr., Kim YK, Chung SC, JW: Effect of botulinum toxin injection on nocturnal bruxism: A randomized controlled trial. Objective: To evaluate the effect type bruxism. Design: Twelve subjects reporting bruxism were recruited for a double-blind, clinical Six bruxers injected with in both masseters, and six saline. Nocturnal electromyographic activity was recorded subject's natural sleeping environment from masseter temporalis muscles before injection, 4, 8, 12 wks after then...

In contrast to sleep‐related oral parafunctional behaviors, little is known about waking behaviors. The Oral Behaviors Checklist contains terms referring a variety of non‐observable behaviors that are reliable when prompted (e.g. ‘clench’) but validity data absent. Our goal was assess whether (i) each behavioral term distinct electromyographically, and (ii) temporomandibular disorder (TMD) subjects differ from non‐TMD in their performance. Surface electromyographic (EMG) activity used...

A numerical model of the mandible, its articulating surfaces, and forces exerted by primary masticatory muscles has been developed for purpose investigating loading temporomandibular joint. Evidence is presented which shows that joint a load-bearing over normal functional range bite-force positions angles. In this investigation, loads were found to vary from maximum appositional force 60% bite (when applied incisors) distracting about 5% distal surfaces third molars). TMJ tended reach...

The purpose of the present study was to determine whether stress induced a consistent pattern increased electromyographic (EMG) activity in different masticatory muscles, and produced changes jaw position. Thirty-five dental students at Taipei Medical College volunteered for this study. Mental arithmetic used create condition relaxation instruction help relax subjects. Subjects were asked evaluate they felt under each experimental with visual analogue scale (VAS). Surface electrodes monitor...

The purpose of this research was to compare, in the subjects, duration EMG silent period with jaw motion error. results indicate that both error and are large patients TMJ-muscle-pain dysfunction, small normal successfully treated patients. There is a statistically significant correlation (r = 0.91; P < 0.01) between two diagnostic parameters dysfunction.

Gonzalez Y, Iwasaki LR, McCall Jr WD, Ohrbach R, Lozier E, Nickel JC. Reliability of electromyographic activity vs. bite-force from human masticatory muscles. Eur J Oral Sci 2011; 119: 219–224. © 2011 The reproducibility (EMG) in relation to static muscles for a given biting situation is largely unknown. Our aim was evaluate the reliability EMG humans. Eighty-four subjects produced five unilateral bites different forces at positions on molars and incisors, two separate sessions, surface...

Randomized clinical trials of amitriptyline will require data from pilot studies to be used for sample size estimates, but such are lacking. This study investigated the 6-week and 1-year effectiveness low dose (10-30 mg) treatment patients with chronic temporomandibular disorder (TMD) pain. Based on examination, were divided into two groups: myofascial mixed (myofascial joint disorders). Baseline pain was assessed by a Visual Analogue Scale (VAS) intensity McGill Pain Questionnaire (MPQ)....

During voluntary jaw clenching, a sharp tap to the menton of mandible resulted in transitory silent period (pause) electromyographic activity masseter and anterior temporalis muscles. Factors that could influence duration were studied, including direction magnitude stimulus applied by operator, amount muscular effort exerted subjects, varying occlusal vertical dimensions. Decreased isometric muscle force statistically significant increases durations.

The hypotheses that latency or duration of the EMG silent period evoked by a tap to chin during maximal clench would be more prolonged in severe TMJ patients were tested. mean did not, and did, increase significantly with increased severity dysfunction.

Muscle forces determine joint loads, but the objectives governing mix of muscle involved are unknown. This study tested hypothesis that masticatory exerted during static biting consistent with minimization loads (MJL) or effort (MME). To do this, we compared numerical model predictions data measured from six subjects. Biting tasks which produced moments on molar and incisor teeth were modeled based MJL MME. The slope predicted vs. electromyographic (EMG) for an individual was a perfect match...

Analysis of previous data suggested the hypothesis that temporomandibular joint (TMJ) eminence shapes develop ideally to minimize loads. Hence, we tested this in nine females and eight males each two groups, with without TMJ disc displacement. Participants provided anatomical used a load minimization numerical model predict, jaw-tracking measure, shapes. Coordinate (x,y) were fit third-order polynomials for sessions, sides, methods (predicted, measured) participant. Inter-session reliable...

Structured Abstract Authors – Nickel J, Spilker R, Iwasaki L, Gonzalez Y, McCall WD, Ohrbach Beatty MW, Marx D Objectives To determine the combined effects 1) of stress‐field aspect ratio and velocity compressive strain 2) joint load, on temporomandibular (TMJ) disc mechanics. Setting Sample Population Fifty‐two subjects (30 ♀; 22 ♂) participated in TMJ load experiments. Material Methods In absence human tissue, pig discs were used to variables surface plowing forces, build a biphasic finite...