Impact of Complete Removble Laminar Denture Design on Phonation

Melnychuk M. V., Rozhko М. М.

DENTISTRY

Scentific article

The article intends to discuss an important issue of practical prosthetic dentistry, i. e., speech adap-tation to complete removable laminar dentures. In orthopedic treatment of edentulous patients it is important not only to restore full masticating effectiveness, but to recover the patients completely, i. e., to restore the proportions of the face, aesthetic appearance, speech and other functions. Adaptation to complete removable dentures is a complex process and speech adaptation is no exception. The attempts to improve these processes are crucial for patients. Despite the considerable activities on the improve-ment of clinical and laboratory stages of complete removable laminar dentures manufacturing, there is still a prob-lem to restore phonation during orthopedic treatment. The enhancement of orthopedic treatment in terms of recovery of phonation is only possible when construction of dentures bases will be built on extensive knowledge of speech articulation. The purpose of the study is to increase the efficiency of orthopedic treatment of patients with complete remov-able laminar dentures by improving the technique of constructing the removable denture base with regard to pat-terns of speech articulation. A profilometry have been carried out in the area of hard palate slope for objective assessment of thickness of manufactured removable dentures. After required measurements, made by profilometer, a value of the thickness of the bases of removable dentures was obtained in the area of hard palate slope and mean values were calculated by means of statistical software programs. The comparative analysis has been carried out relative to consonant “SH” pronunciation during orthopedic treatment of complete loss of teeth by removable laminar dentures made by the current and enhanced technique. The basic sequential stages were considered in terms of evaluation of the entropy characteristics of sound “SH” pronunciation on the basis of sound representation of “ISH” letter-combination. The findings established that pressed base reproduces the shape of hard palate. Hard palate shape, saved on the lingual surface of the denture base improves sound “SH” pronunciation by 1. 7 times at the stage of fixation. Besides, it allows restoring the pronunciation of consonantal sound ”SH”on the 7th day after prosthetic appliances were fixed, with entropy mean square value of 0. 02. Mean square deviation difference of sound “SH” entropy evaluation at the stage of fixation of prosthetic appli-ance, manufactured according to generally accepted technique, is due to the fact that patients put more force while pressing their tongues to the outer surface of the base. Conclusion. The optimal denture base thickness in the area of hard palate and the reproduction of hard pal-ate shape on its lingual surface improves the quality of consonant “SH” pronunciation and promotes high quality speech adaptation.

complete removable laminar denture, palatine folds, speech function

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«Bulletin of problems biology and medicine» Issue 2 part 3 (109), 2014 year, 340-342 pages, index UDK 616. 314-07+616-314-77