scholarly journals Study on Physiological Function of Human Temporal Muscle Related to Three-Dimensional Bite Force.

2000 ◽  
Vol 44 (4) ◽  
pp. 486-498
Author(s):  
Masaaki Iwamatsu ◽  
Tetsuo Kawata ◽  
Makoto Watanabe
Keyword(s):  
Physiological Function ◽  
Three Dimensional ◽  
Bite Force ◽  
Temporal Muscle

scholarly journals Bite force and its relationship to jaw shape in domestic dogs

2020 ◽  
Vol 223 (16) ◽  
pp. jeb224352 ◽  
Author(s):  
Colline Brassard ◽  
Marilaine Merlin ◽  
Claude Guintard ◽  
Elodie Monchâtre-Leroy ◽  
Jacques Barrat ◽  
...  
Keyword(s):  
Morphological Variability ◽  
Three Dimensional ◽  
Biomechanical Model ◽  
Bite Force ◽  
Domestic Dogs ◽  
Temporal Muscle ◽  
Molar Teeth ◽  
Mandible Shape ◽  
Force Variation

ABSTRACTPrevious studies based on two-dimensional methods have suggested that the great morphological variability of cranial shape in domestic dogs has impacted bite performance. Here, we used a three-dimensional biomechanical model based on dissection data to estimate the bite force of 47 dogs of various breeds at several bite points and gape angles. In vivo bite force for three Belgian shepherd dogs was used to validate our model. We then used three-dimensional geometric morphometrics to investigate the drivers of bite force variation and to describe the relationships between the overall shape of the jaws and bite force. The model output shows that bite force is rather variable in dogs and that dogs bite harder on the molar teeth and at lower gape angles. Half of the bite force is determined by the temporal muscle. Bite force also increased with size, and brachycephalic dogs showed higher bite forces for their size than mesocephalic dogs. We obtained significant covariation between the shape of the upper or lower jaw and absolute or residual bite force. Our results demonstrate that domestication has not resulted in a disruption of the functional links in the jaw system in dogs and that mandible shape is a good predictor of bite force.

scholarly journals A New Measuring Device for Three-dimensional Bite Force

1989 ◽  
Vol 7 ◽  
pp. 205-210 ◽  
Author(s):  
Masahiko Kikuchi ◽  
Makoto Watanabe ◽  
Yoshinori Hattori ◽  
Akio Kanuma
Keyword(s):  
Three Dimensional ◽  
Bite Force ◽  
Measuring Device

scholarly journals Bite force, cranial morphometrics and size in the fishing bat Myotis vivesi (Chiroptera: Vespertilionidae).

2018 ◽  
Vol 66 (4) ◽  
Author(s):  
Sandra Milena Ospina
Keyword(s):  
Significant Contribution ◽  
Morphological Characters ◽  
Bite Force ◽  
Multivariate Methods ◽  
Morphometric Data ◽  
Insectivorous Bats ◽  
Temporal Muscle ◽  
Skull Size ◽  
Cranial Measurements

Fish-eating in bats evolved independently in Myotis vivesi (Vespertillionidae ) and Noctilio leporinus (Noctilionidae). We compared cranial morphological characters and bite force   between these species to test the existence of evolutionary parallelism in piscivory. We collected cranial distances of M. vivesi, two related insectivorous bats (M. velifer and M. keaysi), two facultatively piscivorous bats (M. daubentonii and M. capaccinii), and N. leporinus to test for differences among the six species, morphometric data was analyzed applying multivariate methods. We also measured bite force in M. vivesi and evaluated if this value was well predicted by its cranial size. Both piscivorous species were morphologically different from the facultatively piscivorous and insectivorous species, and skull size had a significant contribution to this difference. However, we did not find morphological and functional similarities that could be interpreted as parallelisms between M. vivesi and N. leporinus. These two piscivorous species differed significantly in cranial measurements and in bite force. Bite force measured for M. vivesi was well predicted by skull size. Piscivory in M. vivesi might be associated to the existence of a vertically displaced temporal muscle and an increase in gape angle that allows a moderate bite force to process food.

scholarly journals Osteoarthrosis: Analyze of the Molar Bite Force, Thickness and Masticatory Efficiency

2020 ◽  
Vol 121 (2) ◽  
pp. 87-95
Author(s):  
Mariah Acioli Righetti ◽  
Oswaldo Luiz Stamato Taube ◽  
Marcelo Palinkas ◽  
Lígia Maria Napolitano Gonçalves ◽  
Danilo Stefani Esposto ◽  
...  
Keyword(s):  
Muscle Activity ◽  
Muscle Thickness ◽  
Voluntary Contraction ◽  
Bite Force ◽  
Electromyographic Activity ◽  
Temporal Muscle ◽  
Significance Level ◽  
Masticatory Efficiency ◽  
Linear Envelope ◽  
The Right

Osteoarthrosis is a disorder of synovial joints, resulting from destruction of the cartilage and subchondral bone. The present study is aimed to investigate the molar bite force, thickness and efficiency of the masseter and temporalis muscles of subjects with osteoarthrosis. A total of forty-eight subjects participated in the study. They were distributed into two groups: with osteoarthrosis (n=24) and asymptomatic controls (n=24). Subjects were analyzed on the basis of maximal molar bite force (right and left side), thickness (mandibular rest and dental clenching in maximal voluntary contraction) and electromyographic activity of masticatory cycles through the linear envelope integral in habitual (raisins and peanuts) and non-habitual (Parafilm M) chewing of the masseter and temporalis muscles. All the data were analyzed statistically using t-test with a significance level of p≤0.05. There was no difference between groups in maximal molar bite force, muscle thickness and non-habitual chewing. Differences were found on the raisins (p=0.02) and peanuts (p=0.05) chewing for right temporal muscle, with reduced masticatory muscle efficiency in osteoarthrosis subjects. This study showed that osteoarthrosis induces negative changes in habitual chewing, highlighting the efficiency of the right temporalis muscles. The greater temporal muscle activity in subjects with osteoarthrosis may compromise chewing and consequently the nutritional status of adult subjects.

scholarly journals Development of three-dimensional physiological function imaging of biological body by transillumination imaging using near infrared light - preliminary research -

10.29007/dvzs ◽  
2020 ◽  
Author(s):  
Ngoc An Dang Nguyen ◽  
Phuong Anh Bui ◽  
Anh Tu Tran ◽  
Trung An Dang Nguyen ◽  
Van Chinh Nguyen ◽  
...  
Keyword(s):  
Near Infrared ◽  
Physiological Function ◽  
Imaging Modality ◽  
Three Dimensional ◽  
The Body ◽  
Infrared Light ◽  
Body Parts ◽  
Two Dimensional ◽  
Animal Body ◽  
Preliminary Research

In biological tissue, there are different kinds of endogenous chromophores. Their absorption spectra in the optical range are sensitive to the physiological change of the animal body. In the near-infrared region (700-1200 nm wavelength), hemoglobin has a characteristic absorption spectrum which is dependent on its redox state. Therefore, the functional information inside the animal body could be obtained noninvasively by measuring the transmitted light. By detecting the change of the absorption characteristics of the animal body, the functional change inside the body can be detected in a two-dimensional transillumination image. In this paper, we propose preliminary research on developing a novel imaging modality of biological body parts. Using the two-dimensional images obtained in many different orientations, three-dimensional physiological function imaging of the biological body by transillumination could be expected. This paper presents a preliminary result in the experiment to show the feasibility of this technique.

Rapid formation of functional muscle in vitro using fibrin gels

2005 ◽  
Vol 98 (2) ◽  
pp. 706-713 ◽  
Author(s):  
Yen-Chih Huang ◽  
Robert G. Dennis ◽  
Lisa Larkin ◽  
Keith Baar
Keyword(s):  
Physiological Function ◽  
Three Dimensional ◽  
Force Production ◽  
Force Transducer ◽  
Force Frequency ◽  
Platinum Electrodes ◽  
Fibrin Gel ◽  
Novel Method

The transition of a muscle cell from a differentiated myotube into an adult myofiber is largely unstudied. This is primarily due to the difficulty of isolating specific developmental stimuli in vivo and the inability to maintain viable myotubes in culture for sufficient lengths of time. To address these limitations, a novel method for rapidly generating three-dimensional engineered muscles using fibrin gel casting has been developed. Myoblasts were seeded and differentiated on top of a fibrin gel. Cell-mediated contraction of the gel around artificial anchors placed 12 mm apart culminates 10 days after plating in a tubular structure of small myotubes (10-μm diameter) surrounded by a fibrin gel matrix. These tissues can be connected to a force transducer and electrically stimulated between parallel platinum electrodes to monitor physiological function. Three weeks after plating, the three-dimensional engineered muscle generated a maximum twitch force of 329 ± 26.3 μN and a maximal tetanic force of 805.8 ± 55 μN. The engineered muscles demonstrated normal physiological function including length-tension and force-frequency relationships. Treatment with IGF-I resulted in a 50% increase in force production, demonstrating that these muscles responded to hormonal interventions. Although the force production was maximal at 3 wk, constructs can be maintained in culture for up to 6 wk with no intervention. We conclude that fibrin-based gels provide a novel method to engineer three-dimensional functional muscle tissue and that these tissues may be used to model the development of skeletal muscle in vitro.

Effect of chewing and cutting condition for V-shape three-dimensional titanium miniplate for fixation of mandibular angle fractures (MAFs)

2020 ◽  
Vol 11 (4) ◽  
pp. 625-631
Author(s):  
Ruslizam Daud ◽  
Xu Wenzhao ◽  
Ishak Ibrahim ◽  
Nur Saifullah Kamarrudin ◽  
Khairul Salleh Basaruddin ◽  
...  
Keyword(s):  
Bone Structure ◽  
Three Dimensional ◽  
Stress Shielding ◽  
Stress Transfer ◽  
Bite Force ◽  
Von Mises Stress ◽  
Cutting Condition ◽  
Content Type ◽  
Force Condition ◽  
Fixation Stability

PurposeMiniplate shapes determine the fixation stability to promote best healing and osseointegration process of mandibular fracture. In clinical treatment, the common method used two straight-type miniplate or I-shape miniplate; sometimes this method is not stable enough or limited by the fracture geometry and caused high risk of failure due to screw loosening. This paper aims to investigate a new type of miniplate called V-shape miniplate design as an alternative to the standard straight plate based on total displacement, von Mises stress, stress transfer parameter (STP) and strain energy density transfer parameters (SEDPTs) for two types of bite force condition, which is cutting and chewing condition.Design/methodology/approachThe 3D fixation models were constructed and the finite element (FE) simulation is based on the two-bite force load that ranges from 50 to 700 N based on cutting and chewing bite force condition using ANSYS Workbench 19.2.FindingsIn result comparison, the maximum loading of the V-shape miniplate can reduce deformation by 5.9%, reduce stress by 0.58% reduce strain by 8.1% in cutting condition while reducing deformation by 6.43%, reduce stress by 15.25%, reduce strain by 10.1% in chewing condition. To assess the stress transfer behavior of miniplates fixations to the mandibular bone, the STP and SEDPT were evaluated at the normal cortex screw and the locking head screw. In the simulation, the locking head screw is vertical to the bone structure while the cortex screw is 95 degrees to the bone structure, as a result, the STP value for locking head screw is 1.0073 while in cortex screw is 0.7408.Research limitations/implicationsMeanwhile, the SEDPT value for locking head screw is 2.7574 and 1.8412 for cortex screw.Practical implicationsClinically, V-shape miniplate has shown factual data that can be used for prototyping. STP and SEDTP values provide evidence of how fixation stability is better than I-shape miniplate.Originality/valueIn conclusion, the newly designed V-shape miniplate has overall better stability than the standard I-shape miniplate, and the locking head screw has the STP value closer to 1 than the standard cortex screw; it means the locking screw is better in reducing the stress shielding.

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