A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . 186 PART VI. DENTO-FACIAL MALOCCLUSIONS mental area, will be found far more difficult to accomplish than a like movement ofthe upper. Zones of Movement.—The dento-facial area shown in Fig. 121 is naturallydivided into four transverse segments or zones of movement, according to theareas that can be moved separately by a movement of the crowns or the roots ofthe underlying teeth and alveolar process. The zones lying over the crowns of Fig. A. Upper Apical Zone B. Upper Coron
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . 186 PART VI. DENTO-FACIAL MALOCCLUSIONS mental area, will be found far more difficult to accomplish than a like movement ofthe upper. Zones of Movement.—The dento-facial area shown in Fig. 121 is naturallydivided into four transverse segments or zones of movement, according to theareas that can be moved separately by a movement of the crowns or the roots ofthe underlying teeth and alveolar process. The zones lying over the crowns of Fig. A. Upper Apical Zone B. Upper Coronal Zone C. Lower Coronal Zone D. Lower Apical Zone the upper and lower front teeth are properly named the upper and lower coronalzones, and those over the roots, the upper and lower apical zones. If the labialteeth are moved bodily backward or forward, the overlying dento-facial zoneswill respond in proportion to the movement. In cases of bodily upper protrusionsor retrusions, the end of the nose will often partake of the malposition. In thesecases, a bodily corrective movement of the upper labial teeth will usually straightenthe lines of the nose, and thus place it in a more esthetic pose. Remarkable Changes in Facial Expression with Slight Movements It is not often realized what a very small physical change in the outlines andcontours of a face will produce in the appearance and expression of the entirephysiognomy. This is especially true of physical changes within the dento-facialarea that are possible to produce by the movement of the teeth and s
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