A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . ished by scraping the metal casts, and if too long, theobturator can be reduced. These movements should be done cautiously, however,if the obturator-model has been properly formed, because the subsequent functionalefforts of the muscles to completely close an almost closed opening in uttering allof the oral elements, except m, n, and ng, will cause these muscles which have neverbeen used under speech impulses, to develop surprisingly. To leave the largestpossible space at the po
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . ished by scraping the metal casts, and if too long, theobturator can be reduced. These movements should be done cautiously, however,if the obturator-model has been properly formed, because the subsequent functionalefforts of the muscles to completely close an almost closed opening in uttering allof the oral elements, except m, n, and ng, will cause these muscles which have neverbeen used under speech impulses, to develop surprisingly. To leave the largestpossible space at the posterior border of the veil when the muscles are relaxed, is of thegreatest importance to speech and healthful breathing (Fig. 26). This part of the work should not be done hastily, or with lengthened sittings,as an irritated condition of the sensitive pharyngeal mucous membrane will starta tetanic contraction of the muscles that will lead to a very deceiving estimation Nasal view of the completed model of the obturatorplaced on the plaster working-model. CHAPTER IV. THE TRIAL-MODEL OF THE OBTURATOR 455 Fig. of the size of the pharynx in its apparently relaxed state. One will often be sur-prised after a supposedly perfect fitting of the veil, to find on a later day that itshould be considerably extended. It would be well to state at this time that one is likelyto meet with an imusual variation in the form of thepharynx and the position and action or inaction of thepharyngeal muscles. This is not easily discernible, andmay allow the obturator to unexpectedly fall from itssafe position, even when a perfect impression has beenseciu-ed, shown by the difficulty in removals of the trial-model and final obturator. It seems to occiu- dtiring arelaxation of the muscles in a sudden forcible intake ofthe breath, and is usually remedied by tipping the veilof the obturator up to a higher position m the in one instance, in the authors practice, has thisresulted in danger of
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