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Biomedical subjects

M Arcan

Publications and source records attributed to M Arcan.

10 recordsLinked to original sources
PubMed1992

Foot-ground pressure pattern of flexible flatfoot in children, with and without correction of calcaneovalgus.

The footprint-measuring instrument was used to establish foot-ground pressure pattern of flexible flatfeet in male and female children, aged four to six years. Standing at ease, the children exerted most of their ground pressure by the posterior weight-bearing area (WBA). The rest was distributed between the middle and anterior WBAs, with the middle area usually exerting about 17%, and in extreme cases, as much as 30% of the total foot-ground pressure. Correcting valgus inclination of the calcaneus into neutral by inserting a leather wedge under the medial portion of the heel restored the longitudinal arch and the normal distribution of the foot-ground pressure of the standing child. The middle WBA exerted only 6% of the total pressure. This measuring system can differentiate between a normal foot, a flexible flatfoot, and a rigid flatfoot. It also can measure the exact amount of abnormal pressure being exerted by the middle WBA.

Biometry↗
PubMed1984

A method for in vivo quantitative occlusal strain and stress analysis.

A method to evaluate in vivo dental occlusal relationships by measuring strains and stresses, memorized in a thin wafer during occlusion, is presented. The method is based on the property of some polymers to memorize mechanical birefringence (the photoplastic phenomenon); it provides and records static and kinematic patterns related to the sequence of contacts during occlusion. This sequence determines the intensity levels of contacts according to impressions on the memorizing sheet. The method consists of observing and measuring, with an optical instrument, birefringence patterns appearing on a special memory sheet upon which a patient has occluded according to specific instructions. Two ways may be considered: the strain analysis and the stress analysis approach. The goal of the strain analysis approach is mostly clinical: to help attain harmonization of the static and kinematic occlusal patterns by detecting and eliminating prematurities and interferences through a step-by-step improvement of the strain uniformity. Other clinical uses include: Relating occlusal strain patterns to traumatic occlusion, bruxism or other functional disturbances. Diagnosing pain-dysfunction syndrome of supporting tissues in subjects with removable complete or partial dentures. Substantiating the comparative effect of supporting implants in combination with natural teeth in bridges, etc. The goal of the stress analysis approach is both clinical and theoretical, providing help in understanding the temporo-mandibular mechanical relationship.

Biomechanical Phenomena↗
PubMed1977

FGP assessment of postural disorders during the process of rehabilitation.

Application of the newly developed footground pressure pattern (F.G.P.) method to a number of cranio-cerebral injured patients (C.C.I.) as well as to hemiplegics and normal subjects is made. The postural disorders in standing are assessed through modifications of the F.G.P. and different stages of the rehabilitation process may be followed up. Special parameters of the standing posture, which characterize its disorders, are presented; a diagonal pressure pattern is described. The visual qualitative analysis of the pressure pattern may also be directly useful in the physiotherapy treatment.

Biomedical Engineering↗
PubMed1975

The effect of fluoride alone or fluoride followed by calcium and vitamin D on disuse osteoporosis of the rat tail vertebrae.

The therapeutic effect of fluoride alone or fluoride followed by calcium and vitamin D administration on the osteoporosis induced by immobilization of the rat tail vertebrae was investigated. Tail immobilization was carried out by musclectomy and tendectomy. After 60 days of immobilization, the vertebrae were examined for bone mass, breaking strength, ash percentage and Ca, P and F content. NaF or Ca and vitamin D as separate treatments improved the osteoporosis induced by immobilization. The effects of NaF treatment were more pronounced than those of Ca and vitamin D. NaF and NaF followed by Ca and vitamin D produced a similar degree of improvement in breaking strength. The fact that fluoride and calcium and vitamin D were administered separately and sequentially may explain the absence of a synergistic effect.

Animals↗
PubMed1975

A photoelastic force-indicating spreader for the correction of scoliosis.

The Harrington rod procedure for the surgical correction of scoliosis may be safely applied only if the spreader is instrumented with a force indicator. A method is described here of providing the surgeon with simple and direct means of controlling the force exerted with the spreader, using a photoelastic transducer with a special device for temperature compensation which is built into the spreader.

Elasticity↗