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Biomedical subjects

H F Atkinson

Publications and source records attributed to H F Atkinson.

At least 19 recordsLinked to original sources
PubMed1989

Unity in dentistry.

Explore the source record for details and available documents.

Comprehensive Dental Care↗
PubMed1984

Mandibular movement in lateral excursions.

Mandibular movement during lateral articulatory movements was studied in young subjects with no apparent dental disease or malocclusion. A closed circuit television movement detector was used. Signals of each vector of movement were combined in pairs to provide envelopes of movement in three planes, mutually at right angles. Symmetry of movement was not as common as expected and sudden small changes in direction were frequently observed. Maximum displacement in each vector of movement was not always coincident. It is postulated that treatment factors, such as simple restoration of teeth, are initiating factors which cause variation in mandibular movement from the normal.

Adolescent↗
PubMed1983

An analysis of tooth position on initial tooth contact.

A closed circuit television movement detector was used to study mandibular movement in the form of tooth tapping, in subjects with no apparent dental disease or malocclusion. The velocity and form of various phases of movement was studied, in the transverse, sagittal and coronal planes, from measurements made on u.v. charts and X-Y recordings. It was shown that closing movements were more direct and faster than opening movements; that initial contact on closing is in a well-defined contact area, followed by a sliding of cusps over each other to a final centric position and that the closing path of the mandible in tapping movements is in the form of a smooth curve showing simple axis rotation through distances normally greater than those accepted clinically. It was also shown that microphone signals can be detected at times other than when normally expected, indicating displacement with tooth contact, at times other than at the fully intercuspated position.

Dental Occlusion, Centric↗
PubMed1977

In vitro strength of the human periodontal ligament.

The tensile properties of the human periodontal ligament were studied by direct loading and compression experiments. It was found that the ligament behaved in an elastic manner up to an elastic limit after which rupture occurred. The values obtained for the tensile strength of the ligament are in general agreement with those of other workers for similar tissues.

Dental Stress Analysis↗
PubMed1976

Research into mastication.

An electronic method of recording displacement was used to study mandibular movement during mastication. The technique enables the parameters of muscle activity, the sound of tooth contact, the force developed between opposing teeth, and the displacement of the mandible to be recorded at the same time on a single U/V chart. Previous reports on mandibular movement using cine-photographic techniques were confirmed in relation to mastication, but additional information was obtained in relation to muscle activity in the final closing movements. It appears that tooth contact initiates a latent-silent period in masseter and temporalis which occurs before movement is arrested in the final intercuspal position. It is considered that the kinetic energy of the mandible on closing is reduced by the cessation of activity in these two muscles during the silent period and finally absorbed by the crushing of food during the terminal intercuspal slide to rest. A description of mastication is given and a theory advanced that this may be controlled by a central clock mechanism.

Electromyography↗