Recent studies of human arm movement have suggested that the control of stiffness may be important both for maintaining stability and for achieving differences in movement accuracy. In the present study, we have examined the voluntary control of postural stiffness in 3D in the human jaw. The goal is to address the possible role of stiffness control in both stabilizing the jaw and in achieving t...

Speech production involves some of the most precise and finely timed patterns of human movement. Here, in the context of jaw movement in speech, we show that spatial precision in speech production is systematically associated with the regulation of impedance and in particular, with jaw stiffness--a measure of resistance to displacement. We estimated stiffness and also variability during movemen...

Medication-related osteonecrosis of the jaw (MRONJ) is a rare but serious disease that can affect person's upper or lower jaw.1Feng Z Ann J Zhang Y Factors influencing severity medication-related jaw: retrospective study.J Oral Maxillofac Surg. 2021; 79: 1684-1689Abstract Full Text PDF Scopus (4) Google Scholar First described in 2002, it progressive death jawbone person exposed to medication k...

Intramandibular joints (IMJ) are novel articulations between bony elements of the lower jaw that have evolved independently in multiple fish lineages and are typically associated with biting herbivory. This novel joint is hypothesized to function by augmenting oral jaw expansion during mouth opening, which would increase contact between the tooth-bearing area of the jaws and algal substratum du...

This study investigates the motor pattern and head movements during feeding of a durophagus shark, the bonnethead Sphyrna tiburo, using electromyography and simultaneous high-speed video. Sphyrna tiburo feeds almost exclusively on hard-shelled crabs, with shrimp and fish taken occasionally. It captures crabs by ram feeding, then processes or reduces the prey by crushing it between molariform te...

Precise control of jaw length during development is crucial for proper form and function. Previously we have shown that in birds, neural crest mesenchyme (NCM) confers species-specific size and shape to the beak by regulating molecular and histological programs for the induction and deposition of cartilage and bone. Here we reveal that a hitherto unrecognized but similarly essential mechanism f...

The crushing chamber is the core component of a cone crusher, consisting mantle and concave parts. Reducing impact wear on performance crushers quality crushed products while extending service life has become significant research challenge. compression ratio particle size distribution coefficient pressure investigated here in order to establish model. effect normal tangential components discuss...

This paper describes the use of a multi-objective evolutionary algorithm to solve an engineering design problem determining the geometry and operating settings for a crusher in a comminution circuit for ore processing. The outcome is a tool for consulting engineers that can be used to create and explore candidate designs for various scenarios. The tool has proved capable of deriving designs tha...

There is a limited understanding of the normal function of the lateral pterygoid muscle (LP) and the role that this muscle plays in temporomandibular disorders. This article addresses the hypothesis that a major function of the LP is in the control of horizontal jaw movements. The range of fiber alignments suited to generating a major horizontal force vector (magnitude and direction), together ...