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Biomedical subjects

A Szentpétery

Publications and source records attributed to A Szentpétery.

12 recordsLinked to original sources
PubMed1999

[Dynamic correction of occlusal surfaces with CAD/CAM methods. Part I. General description of dental CAD/CAM-systems].

The first part of the article presents a brief history and the present stand of dental CAD/CAM systems. The three basic components--scanning, design (CAD) and milling (CAM)--of such systems are described. Their advantages and disadvantages against conventional dental techniques are presented also. One of the most serious shortcomings of these "high-tech" systems is their impossibility to produce dynamic occlusal surfaces.

Computer-Aided Design↗
PubMed1999

[Dynamic correction of occlusal surfaces by means of the CAD-CAM methods. II].

A method of computer aided dynamic correction of digitised occlusal surfaces has been described. A mathematically simulated fully adjustable software articulator has been designed and used in place of a mechanical dental articulator. An optical impression of plaster models is performed using a laser scan device. The digitised models are oriented automatically to each other and to the coordinate-system of the software articulator. A correction algorythmus is supervising the two occlusal surfaces during basic articulator movements and correcting them at places of interference according to a pre-set scheme. An electronic face-boe is being constructed to enhance the preciseness of the model orientation. After completion the method can be used as an integrated part of a foreign dental CAD/CAM system to dynamize static occlusal surfaces, or as a separate system for computer aided functional analysis and correction of natural and artificial occlusal surfaces.

Algorithms↗
PubMed1993

Clinical utility of mandibular movement ranges.

The range of mandibular movements was studied on 600 randomly selected people. Mandibular mobility varied widely from subject to subject. There were considerable age and sex differences but no differences were found between the mobility values of persons who were functionally healthy and those with dysfunctions. These factors make it difficult to construct cutoff values that reflect normalcy in mandibular mobility and thus render the clinical utility of such values questionable. The use of age- and sex-corrected border values for mandibular mobility is proposed. The clinical utility of patients' opinions concerning mouth-opening capacity is stressed. On the basis of statistically significant differences, the use of different border values for the protrusive and laterotrusive movements seems to be necessary.

Adolescent↗
PubMed1990

The problem of the bifid mandibular condyle.

In a survey of 1,882 prehistoric and historic skulls with 2,077 condyles, 7 double (bifid) mandibular condyles were found. One mandible with bilaterally bifid condyles is presented in detail. Possible causes and consequences of the anomaly are discussed. It is assumed that bifid mandibular condyles with anteroposteriorly situated heads are caused by early childhood fractures, whereas those with mediolaterally situated heads are caused by the persistence of connective tissue septa.

Animals↗
PubMed1987

An epidemiologic study of mandibular dysfunction dependence on different variables.

Age and sex characteristics of different signs and symptoms of mandibular dysfunction were studied in 600 randomly selected urban persons. With regard to mandibular mobility marked differences were observed between the sexes, and a steady decrease parallel with ageing. Against this, the percentages of the objective dysfunction signs of impaired mobility and TMJ-sounds, as well as those of the pooled percentages of all the objective signs (Di-I + II + III), increased parallel with ageing. The percentages of headache occurrence peaked in different age groups for men and women. Statistically significant correlations were found between headache, parafunctions, stress, age, the existence of a preferred chewing side, as well as several dental-occlusal factors, and the prevalence of mandibular dysfunction; between Ai and Di according to Helkimo, and between excessive tooth wear and parafunctions.

Adolescent↗
PubMed1986

Prevalence of mandibular dysfunction in an urban population in Hungary.

600 randomly selected subjects from an urban community in Hungary were examined anamnestically and clinically concerning signs and symptoms of mandibular dysfunction. The anamnestic (Ai) and clinical dysfunction (Di) indices according to Helkimo were used. The percentage distribution of the sample was the following: AiO = 79.3%, AiI = 15.3%, AiII = 5.3%; DiO = 20.1%, DiI = 72.3%, DiII = 7%, DiIII = 0.5%. Headache was reported in 23%, bruxism in 10%, joint sounds in 9%, pain in the face, neck, or around the ears in 6%. Clinical signs found at the examination were joint sounds in 46% (crepitation 29%, clicking 22%), muscle tenderness on palpation in 17%, joint tenderness in 3%, pain on movement in 2.5%, restricted mouth opening in 4%, deviation of the mandible in 20%.

Adolescent↗