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W W Bowley

Publications and source records attributed to W W Bowley.

6 recordsLinked to original sources
PubMed1984

Extensibility characteristics of human cheek--visco-elastic properties.

Using a hydraulic bellows system mounted on a maxillary partial denture, continuous force-displacement data were taken in an edentulous area in the maxillary bicuspid-molar region on ten adults. Both loading and unloading force-displacement curves showed three segments. Two visco-elastic properties - hysteresis and relaxation - were consistently evident. The maximum difference in force-magnitude of the hysteresis loop was 1.02 g. A pre-conditioning phenomenon of the cheek tissue, evidence by a reduction of the area of the hysteresis loop, was observed in a series of repeated runs. The significance of the study was that: (1) in some individuals, the cheek could be displaced, by expansion of the molars, up to 1 mm into a second stable position; and (2) the relaxation phenomenon suggests a limited adjustive capacity in cheek stiffness.

Adult↗
PubMed1982

Physical properties of human lips: experimental and theoretical analysis.

The lip stiffness characteristics in the vertical plane of a white population sample, aged 18-26, were studied. The physical properties of the lip system were analyzed and a mathematical model was derived to approximate this system. The instrumentation consisted of a force-transducer bar, a head holder and a three-directional micrometer adjustment. Four specific contact areas were used. Individual lower lip is stiffer than upper lip and the corresponding male lip is stiffer than the female lip. The force-displacement relationship approximates a linear function at small displacements (less than 1 mm) and is a second order function at larger displacements. A mechanical T-spring model approximates the system to an accuracy of about 96%.

Adult↗
PubMedDate not supplied

Determination of arbitrary tooth displacements.

The noninvasive, modern technique based on the method of double-exposure hologram interferometry was used to measure arbitrary displacements of teeth in the three dimensional space. The experimental studies were carried out on an idealized model of the maxillary central incisor. The results show that the experimental data, based on component loading, are inadequate to accurately predict tooth displacement from an arbitrary force acting in the three dimensional space.

Alveolar Process↗