[Voice production in wearers of upper and lower complete dentures].
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A common problem of the mylohyoid ridge in the resorbed edentulous mandible is discussed. A surgical technique that is simple, though efficient, is described for the elimination of the anomaly in the ambulant patient. A prosthetic technique is suggested for maximum advantage to be gained from the operation.
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1. The load capacity of complete upper dentures objectively proved greater than that of lower dentures. 2. The load capacity and, consequently, the stability of position of the lateral area of upper dentures objectively diminished with advancing time of wearing, but increased in the lower jaw. 3. The stability of complete dentures is not determined exclusively by the quality of the denture bearing tissue. 4. The measured stability of position of complete dentures did not correspond with the subjective impression of full function; in general, this was stated to be as good as ever by all patients.
Clinical experience in the prosthetical care of edentulous patients shows that primarily patients wearing dentures for the first time express the desire, after a few months, to have original denture adhesion restored. Especially for complete lower dentures diminishing adhesion is unfavorable. Measurements regarding the adhesive strength of complete lower dentures of 34 patients showed that adhesive strength is decreasing. This was measured and statistically evaluated in this investigation. 33 percent of the original adhesive strength is lost within 6 months. With originally strong adhesion (2, 000 p) this reduction is more drastic than with originally small adhesion (200 p). It was not possible to establish that adhesive strength is declining preferably as a result of a specific anatomic situation.
In a cross-sectional study involving 185 full denture wearers, the stability of upper and lower dentures was determined by means of active test movements according to Herbst. The percentages of instable dentures and their confidence intervals were calculated. It was found that all sections of upper full dentures can be regarded as equal with regard to stability, whereas the sections of lower full dentures showed considerable differences. Finally, practice-relevant conclusions are drawn from the results of the present study.