[Biophysical principles of partial removable denture function].
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In 1993 the Vigano attachment appeared in Hungarian commercial turnover. On the basis of 20 cases observed during one year it can be stated, that the use is simple for dental technicians, the fitting effect is good, requires small place, insertion and removal is easy for elderly and handicapped patients; it is aesthetically satisfying and the design ensures minimum likelihood of repairs.
An outfit for fixing removable dentures in single standing teeth contains internal and external telescopic crowns. The latter is fitted out with a clasp and a cut-out on the oral surface. In order to enhance the design rigidity and denture fixation safety, the two-layer internal crown is placed on the vestibular and approximate surfaces, whereas the clasp on the external layer thereof.
The aim of this study was to evaluate the longitudinal clinical and physiological changes in jaw elevator muscle activity of partially edentulous patients, for approximately 3.5 years after treatment by removable partial dentures with free-end saddles. Seven patients (4 males and 3 females, aged 38-68 years) who visited a university dental hospital, and were found to have no signs and symptoms of TMJ disorders, participated in the follow-up study. The functional impression method with wax was used in the treatment process of these patients. At the follow-up times of 0.5, 1, 2, 3, and 3.5 years after denture deriverly, EMG activities using bipolar surface electrodes were recorded from masseter and anterior temporal muscle on both sides during maximal voluntary clenching and tapping, and at the same time the maximal bite force was also recorded using the Dental Prescale System. The integrated EMG, the correlation coefficient between muscle activities of both sides, bite force, and the location of the occlusal load center, were analyzed using repeated measured ANOVA. A comparison between each measuring session was carried out using Bonferroni's method. Results were as follows: i) The muscle function of partially edentulous patients was clearly activated by wearing a removable partial denture, and the activation was kept at the same level until 3.5 years after denture deriverly. ii) The activation of jaw elevator muscles by wearing a denture was greater in masseter muscle than in anterior temporal muscle. This finding reflected the effect of the recovered occlusal contact. iii) The occlusal load center of the recovered dentition by a removable partial denture shifted antero-posteriorly close to the end abutment teeth.
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