Jaw Movement Recording Research Articles

Magnetometer Recording of Jaw Movements during Speech

A new technique has been developed for transducing movements of the mandible during speech production. The equipment employed includes a three-coil magnetometer system that enables real-time recording of jaw movements without encumbrance to natural articulation. Theoretical principles underlying the technique will be discussed together with procedures for using and calibrating the equipment. Examples of one- and two-dimensional measurements will be presented, the latter being related to motion-motion pathways followed during nonspeech movements of the mandible. It is proposed that departures from two-dimensional passive opening-closing pathways can be interpreted in terms of the net muscular forces operating on the jaw. Beyond the technique described, it is suggested that magnetometers have attractive potential as a research tool in speech physiology. Within this framework, brief discussion is offered on the application of a miniature magnetometer unit to the study of lip, tongue, velar, and pharyngeal monitoring during speech production.

Jaw movements engraved in solid plastic for articulator controls. Part II. Transfer apparatus

A new apparatus and method was described for transferring recorded jaw movements through a mechanical engraving device directly into a pair of plastic blocks to form an individual set of articulator controls for each patient.

Jaw movements engraved in solid plastic for articulator controls. Part I. Recording apparatus

A new apparatus and method for measuring and recording jaw movements was described. All jaw movement information is recorded directly from the patient in the form of engravings in solid plastic. These engravings are related to the hinge axis. Part II of this article will describe a method and apparatus for transferring the information recorded directly from the patient, through a mechanical device, directly into a pair of plastic blocks to form a second set of hinge axis engravings. This pair of transferred recordings will constitute the total information needed to guide the two styluses of the mandibular part of an articulator.

Fluorescent photoanthropometry: A method for analyzing mandibular motion

M andibular motion has been studied and photographically recorded by Kurth,l+ Posselt,5 Schweitzer, 6* 7 Rudd,8 and Ahlgreng and various techniques were used. Most photographic techniques for recording jaw movements involve the attachment of indicator spheres to the maxillary and mandibular dental arches. The paths produced by these indicators during functional or simulated functional jaw movements are recorded on film for study and analysis. However, the inherent limitations of conventional photographic techniques preclude both accurate linear measurements and determination of parameters such as velocity, accleration, and the area of the envelope of motion.

A PHOTOELECTRIC METHOD FOR RECORDING JAW MOVEMENTS.

A PHOTOELECTRIC METHOD FOR RECORDING JAW MOVEMENTS.

Rumination in sheep. I. The influence of rumination and grinding upon the passage and digestion of food

The nutritional significance of rumination was investigated in relation to certain aspects of rumen function, by using:(a) a chaffed roughage ration on which rumination was either allowed to occur normally or was restricted by means of a muzzle, and (b) a finely ground ration with either the normal rumination or with the addition of polyethylene flakes to stimulate rumination. An apparatus for recording jaw movements was used to measure the extent of rumination. Compared with the chaffed ration, grinding resulted in a shorter retention time of stained particles in the digestive tract, and lower apparent dry matter, organic matter, and crude fibre digestibilities. The addition of polyethylene flakes to the ground ration tended to further decrease retention time and caused a lowering of apparent dry matter, organic matter, and crude fibre digestibilities. The effect of muzzling, to restrict rumination, was to markedly increase the retention time, and this was accompanied by higher apparent dry matter, organic matter, and crude fibre digestibilities than when rumination was not restricted. Supplementary rumen metabolic data are presented. The importance of the mechanical activity in the digestive process is stressed.