scholarly journals Studies on the Standardization of Parameters for Jaw Movements Analysis-Jaw Movement Analysis at the Incisal Point-

2008 ◽  
Vol 52 (3) ◽  
pp. 311-320 ◽  
Author(s):  
Hisahiro Takeuchi ◽  
Eiichi Bando ◽  
Susumu Abe
Keyword(s):  
Movement Analysis ◽  
Jaw Movements ◽  
Jaw Movement

Coordination of Tongue Pressure and Jaw Movement in Mastication

2006 ◽  
Vol 85 (2) ◽  
pp. 187-191 ◽  
Author(s):  
K. Hori ◽  
T. Ono ◽  
T. Nokubi
Keyword(s):  
Late Stage ◽  
Healthy Subjects ◽  
Hard Palate ◽  
Early Stage ◽  
Pressure Sensors ◽  
Tongue Pressure ◽  
Normal Pattern ◽  
Jaw Movements ◽  
Jaw Movement ◽  
Palatal Plate

The tongue plays an important role in mastication and swallowing by its contact with the hard palate. Using an experimental palatal plate with 7 pressure sensors, and recording jaw movement using mandibular kinesiography, we assessed, in healthy subjects, the coordination of tongue and jaw movements during the entire masticatory sequence of solids, by measuring tongue pressure against the hard palate. Tongue pressure appeared during the occlusal phase, reached a peak near the start of opening, and disappeared during opening. Specific patterns in order, duration, and magnitude of tongue pressure were seen at the 7 pressure sensors in each chewing stroke. Magnitude and duration were significantly larger in the late stage of chewing (8 strokes before initial swallowing) than in the early stage (until 8 strokes after starting mastication). The normal pattern of tongue contact against the hard palate, control of tongue activity, and coordination with jaw movement during mastication is described.

scholarly journals Development of 2-D Jaw Movement Simulator (JSN/S1)

1998 ◽  
Vol 10 (6) ◽  
pp. 499-504 ◽  
Author(s):  
Shin-ichi Nakajima ◽  
◽  
Toyohiko Hayashi ◽  
Hiroshi Kobayashi ◽  
◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Sagittal Plane ◽  
Jaw Movements ◽  
Occlusal Force ◽  
Neural Network Learning ◽  
Jaw Movement ◽  
Network Learning ◽  
Control Scheme ◽  
Muscle Actuators ◽  
Dc Servomotor

Human mastication is performed by coordinated activities of several jaw muscles. To clarify functions of these muscles, we developed a jaw movement simulator (JSN/Sl) consisting of a 2 degrees of freedom (2DOF) mechanism and five muscle actuators able to reproduce jaw movements on a sagittal plane. The actuator is a cable-tendon driven by a DC servomotor controlled by a compliance control scheme to obtain viscoelastic muscle characteristics. To simulate life-like clenching, we controlled occlusal position and force by incorporating position and force sensors, using neural network learning control. Occlusal force successfully converged to a desired value through learning. Tension patterns of muscle actuators during clenching well coincided with human jaw activities.

Mechanical Perturbation of Jaw Movements during Speech: Effects on Articulation and Phonation

1995 ◽  
Vol 80 (3_suppl) ◽  
pp. 1108-1112 ◽  
Author(s):  
Anne Bauer ◽  
Lutz Jäncke ◽  
Karl Theodor Kalveram
Keyword(s):  
Mechanical Load ◽  
Load Application ◽  
Mechanical Perturbation ◽  
Jaw Movements ◽  
Jaw Movement ◽  
Opening And Closing ◽  
Stress Patterns

12 subjects uttered the testword /papapas/ repeatedly with three different speech rates and two stress patterns. On 17% randomly chosen trials, a mechanical load was applied unpredictably to the jaw in the direction of the opening movement. Load onset was triggered by the start of the first phonation. Analysis showed that the opening and closing displacements of the jaw movement in the first syllable were not influenced significantly by the perturbation. The load application prolonged the duration of the jaw movement in unstressed syllables but not in stressed syllables. Further, the mechanical perturbation of the jaw led to increased duration of phonation in unstressed syllables only, the effect for duration of phonation being greater at higher speech rates. These results demonstrate a coupling between articulation and phonation.

Occlusal Movements of the Brushtail Possum, Trichosurus-Vulpecula, From Microwear on the Teeth

1990 ◽  
Vol 38 (1) ◽  
pp. 41 ◽  
Author(s):  
WG Young ◽  
CKP Brennan ◽  
RI Marshall
Keyword(s):  
Sagittal Plane ◽  
Contralateral Side ◽  
Brushtail Possum ◽  
Trichosurus Vulpecula ◽  
Jaw Movements ◽  
Dental Wear ◽  
Jaw Movement ◽  
Mandibular Molars ◽  
Molar Teeth

This study characterises the jaw movements of the brushtail possum, Trichosurus vulpecula, from an analysis of microwear on the premolar and molar teeth. From 10 skulls of T, vulpecula, micrographs of tooth replicas which exhibitied progressive degrees of dental wear were examined for the location of wear facets and the orientation of striae on them. These data were transferred to transparencies overlying occlusal photographs of the jaws. Two movements, a vertical sectorial movement in the premolars segment and an anteromedial shearing and grinding stroke in the molar segment, were inferred. The directions of wear striations with respect to the sagittal plane supported the concept that the mandible rotates around the contralateral condyle from the working side. No evidence of balancing contact facets were found on the teeth of the contralateral side, in agreement with an anisognathous jaw movement. Videoradiographic observations of the chewing cycle of one brush-tailed possum confirmed that puncture crushing is employed early in the chewing cycle, followed by an anisognathous labiolingual transit of the mandibular molars. However, the resolution of the condyle by videoradiography was insufficient to determine the point of rotation of the jaw movements.

scholarly journals Changes of the Rumination Characteristics in Dairy Cows After Change TMR Composition

2019 ◽  
Vol 67 (5) ◽  
pp. 1153-1157
Author(s):  
Peter Juhás ◽  
Katarína Špulerová ◽  
Klára Vavrišínová ◽  
Katarína Hozáková ◽  
Peter Strapák
Keyword(s):  
Dairy Cattle ◽  
Dairy Cows ◽  
Lactation Period ◽  
Jaw Movements ◽  
Total Mixed Ration ◽  
Jaw Movement ◽  
Reproduction Management ◽  
Holstein Dairy Cows

Rumination behavior in cattle is important for health and reproduction management of herd. The aim of presented paper was to evaluate change in rumination behavior in dairy cattle after changing total mixed ration (TMR) composition. Twenty-eight multiparous Red Holstein dairy cows were observed during rumination in first month after calving and in fourth month after calving. Cows were fed different total mixed ratio at beginning of lactation in first month after calving (TMR1) and in mid of lactation period in fourth month after calving (TMR2). TMR2 has higher content of roughage. Length of the single rumination period and number of jaw movements during rumination one bolus were recorded. Frequency of jaw movement per minute was calculated from recorded rumination characteristics. Rumination of one bolus TMR2 was longer (TMR1 = 53.97 ±8.241 sec, TMR2 = 57.57 ±6.290 sec) and cow perform more jaw movements (TMR1 = 61.0 ±10.674, TMR2 = 65.99 ±9.682) than ruminating bolus TMR1. Difference in duration of rumination one bolus as well as number of jaw movement was significant (P < 0.001). Frequency of jaw movement was not significantly affected (P > 0.05) and seem to be intra-individual stable. Rumination evaluated by correlation of rumination characteristics for TMR1 and TMR2 was intra-individual stable despite of changes in times of jaw movement and duration of one bolus rumination.

Smoothness of Human Jaw Movement during Chewing

1999 ◽  
Vol 78 (10) ◽  
pp. 1662-1668 ◽  
Author(s):  
K. Yashiro ◽  
T. Yamauchi ◽  
M. Fujii ◽  
K. Takada
Keyword(s):  
Time Profile ◽  
Rate Of Change ◽  
Movement Trajectory ◽  
Jaw Movements ◽  
Jaw Movement ◽  
Movement Trajectories ◽  
Gum Chewing ◽  
Minimum Jerk ◽  
Jaw Opening ◽  
Movement Smoothness

Human limb movements are successfully modeled based on the assumption that the central nervous system controls the movements by maximizing movement smoothness. Movement smoothness is quantified by means of a time integral of squared jerk (jerk-cost), where jerk is defined as the rate of change in acceleration. This study was performed to investigate whether the control of human masticatory vertical jaw movements can also be explained by a minimum-jerk (maximum-smoothness) model. Based on the assumption that minimum-jerk models account for vertical jaw-opening and -closing movements during chewing, the actual time profile of the movement trajectory was simulated by the model. The simulated jerk-costs and peak velocities were compared with those obtained by actual measurements of jaw movements during chewing. Jerk-costs and peak velocities of the jaw movements during chewing were significantly correlated with those predicted by minimum-jerk models (P < 0.0001, r between 0.596 and 0.799). The minimum-jerk models predicted closing movement trajectories more accurately than opening movement trajectories (jaw opening, root-mean-square error = 1.19 mm; jaw closing, 0.52 mm, t = 4.375, P < 0.0001). The results indicated that the vertical jaw movement control during chewing was represented by the minimum-jerk control model and that the vertical jaw-closing movement is smoother than the opening movement during gum-chewing.

Anatomical location of various condylar points for jaw movement analysis in Japanese women

2010 ◽  
Vol 37 (4) ◽  
pp. 235-241
Author(s):  
H. TOKIWA ◽  
F. NAKAZAWA ◽  
M. OZAKI ◽  
Y. NAKAMURA
Keyword(s):  
Movement Analysis ◽  
Japanese Women ◽  
Anatomical Location ◽  
Jaw Movement

scholarly journals Kinematic Features of Jaw and Lips Distinguish Symptomatic From Presymptomatic Stages of Bulbar Decline in Amyotrophic Lateral Sclerosis

2018 ◽  
Vol 61 (5) ◽  
pp. 1118-1129 ◽  
Author(s):  
Andrea Bandini ◽  
Jordan R. Green ◽  
Jun Wang ◽  
Thomas F. Campbell ◽  
Lorne Zinman ◽  
...  
Keyword(s):  
Amyotrophic Lateral Sclerosis ◽  
Movement Analysis ◽  
Speaking Rate ◽  
Classification Algorithms ◽  
Facial Movement ◽  
Jaw Movements ◽  
Lower Lip ◽  
Facial Movements ◽  
Work Supports ◽  
Lateral Sclerosis

Purpose The goals of this study were to (a) classify speech movements of patients with amyotrophic lateral sclerosis (ALS) in presymptomatic and symptomatic phases of bulbar function decline relying solely on kinematic features of lips and jaw and (b) identify the most important measures that detect the transition between early and late bulbar changes. Method One hundred ninety-two recordings obtained from 64 patients with ALS were considered for the analysis. Feature selection and classification algorithms were used to analyze lip and jaw movements recorded with Optotrak Certus (Northern Digital Inc.) during a sentence task. A feature set, which included 35 measures of movement range, velocity, acceleration, jerk, and area measures of lips and jaw, was used to classify sessions according to the speaking rate into presymptomatic (> 160 words per minute) and symptomatic (< 160 words per minute) groups. Results Presymptomatic and symptomatic phases of bulbar decline were distinguished with high accuracy (87%), relying only on lip and jaw movements. The best features that allowed detecting the differences between early and later bulbar stages included cumulative path of lower lip and jaw, peak values of velocity, acceleration, and jerk of lower lip and jaw. Conclusion The results established a relationship between facial kinematics and bulbar function decline in ALS. Considering that facial movements can be recorded by means of novel inexpensive and easy-to-use, video-based methods, this work supports the development of an automatic system for facial movement analysis to help clinicians in tracking the disease progression in ALS.

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