A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . ber of textbooks, whichunfortunately continued to publish it long after this very crude method hadbecome obsolete. This incident is mentioned here to show how very few years have elapsed since rubber plates were considered one of the principal means in the regulation of teeth. Fig. 196. A number of years later, the author introduced another far more efficient andless troublesome method which is illus-trated in Fig. 196. To this was added thenow indispensable shell crowns instead
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . ber of textbooks, whichunfortunately continued to publish it long after this very crude method hadbecome obsolete. This incident is mentioned here to show how very few years have elapsed since rubber plates were considered one of the principal means in the regulation of teeth. Fig. 196. A number of years later, the author introduced another far more efficient andless troublesome method which is illus-trated in Fig. 196. To this was added thenow indispensable shell crowns insteadof bands on the first molars, which atonce opens the bite to the desired extentand permits a rapid extrusive movementof the premolars to the new occlusalplane, through the action of the springarch-bow. The second molar being the youngest tooth and often not fully erupted,will continue its growth to the new functional occlusal plane. Furthermore, thereaction of the spring bow in front exerts an intrusive force upon the incisors,which aids in correcting their supra-occlusal position, and provides room for the 283. 284 PART VI. DENTO-FACIAL MALOCCLUSIONS desired retruding movement of the upper front teeth and for the dento-facialand occlusal correction of the entire denture; the whole operation being carried onat the same time and with very little suffering to the patient. The first molars, being the oldest and strongest, and consequently the moststable teeth in the mouth, are admirably adapted for the crowns to sustain theforces of mastication for the very few months which are required to establish thefull masticating position of the other teeth. It would seem that the sudden neces-sity of commencing and continuing the entire mastication upon these crowns alone Fig. 197.
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