A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . proper retaining appliance that is intended to permanently sus-tain the position gained. On the other hand, the truly wonderful work which thissingle apparatus has accomplished in the authors hands, proved now by hundredsof successful cases, convinces him that its work in other hands will cause thisprinciple to grow into great possibilities. CHAPTER XLIII Division 2, Class III CONTRACTED RETRUSION OF THE UPPER DENTURE Division 2 presents quite a variety of dental malpositions wh
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . proper retaining appliance that is intended to permanently sus-tain the position gained. On the other hand, the truly wonderful work which thissingle apparatus has accomplished in the authors hands, proved now by hundredsof successful cases, convinces him that its work in other hands will cause thisprinciple to grow into great possibilities. CHAPTER XLIII Division 2, Class III CONTRACTED RETRUSION OF THE UPPER DENTURE Division 2 presents quite a variety of dental malpositions which arise mostlyfrom local causes, all of which present the same peculiar facial expression that ischaracteristic of Class III. Contracted retrusions of the upper denture are due totwo main causes: First, from adenoids, etc., inhibiting the growth development ofthe maxilla, which thus does not give sufficient room for the proper eruption of thepermanent teeth in the contracted maxillary arch. In consequence of this, theteeth, and particularly the cuspids, are forced out of alignment, or impacted, with Fig. the producton of a dental and alveolar arch that is contracted in its dimensionsin relation to the normal. The second form is caused by injudicious extraction,or the premature loss of the deciduous teeth through extensive decay, or the lackof permanent teeth from extinction of the tooth germs. When any of these local causes are ingrafted upon an inherited upper retru-sion, they proportionately increase the dental malposition and facial of local causes and inherited retrusions result in many of the most 301 302 PART VI. DENTO-FACIAL MALOCCLUSIONS pronounced dento-facial malocclusions of this Class, some of which are illustratedin Division 3. In Chapter XL, the case illustrated by Fig. 204 was caused by the very earlyloss of the upper first permanent molars, and those cases illustrated in Figs. 205and 206 in the same chapter were partly caused throu
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