A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . to place the thumb in the roof of the mouth and suck on it tofully understand the mechanical action of the several forces, i. e., the pressure ofthe buccinator muscles, the forward pull of the ball of the thumb upon the upper,and the pressure of the knuckle upon the lower incisors, with the muscles of thearm relaxed and its weight pulling downward. A very little thought will determine also the effect of thiscause upon Classes II and III Malocclusions. The habit which commences i
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . to place the thumb in the roof of the mouth and suck on it tofully understand the mechanical action of the several forces, i. e., the pressure ofthe buccinator muscles, the forward pull of the ball of the thumb upon the upper,and the pressure of the knuckle upon the lower incisors, with the muscles of thearm relaxed and its weight pulling downward. A very little thought will determine also the effect of thiscause upon Classes II and III Malocclusions. The habit which commences in infancy, and frequentlycontinues into the early periods of secondary dentition, maybe readily stopped with the appliance shown in Fig. 144,which consists of a loosely telescoping bar and tube, straightor curved, one end of each being soldered to deciduous molarbands, as shown. The easy gliding movement of the barpermits the natural growth expansion of the arch. Thisappliance produces no material disturbance, except that it prevents the thumbfrom taking its accustomed position, and at once stops the habit. 218.
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