A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . t posterior positions in the glenoid fossae; while the incisal edges of the lowerlabial teeth pass slightly back of those of the upper. The labial teeth and all of that portion of the adjoining osseous structurewhich it is possible to move with dental appliances, constitute the main frameworkof the dento-facial area. And while no artistic or mathematical rules can be laiddown as a standard of facial beauty because of the variety of different types thatare denominated as beautifu
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . t posterior positions in the glenoid fossae; while the incisal edges of the lowerlabial teeth pass slightly back of those of the upper. The labial teeth and all of that portion of the adjoining osseous structurewhich it is possible to move with dental appliances, constitute the main frameworkof the dento-facial area. And while no artistic or mathematical rules can be laiddown as a standard of facial beauty because of the variety of different types thatare denominated as beautiful, it is nevertheless true that certain standards ofphysical relation must always obtain with every physiognomy which lies withinthe field of what is termed beauty and esthetic perfection. As the chin should always be sufficiently prominent in relation to the lowerlip to produce no suggestion of a receding chin, the antero-posterior relations ofthe lower teeth to the mandible-—upon which this portion of the facial outlinesdepend—should be such as to bring into decided evidence the graceful concave Fig. curve of the labio-mental depression. The normal closure of the lower labialteeth, slightly back of the upper labial teeth, permits the desired esthetic harmonyin the relations of the upper and lower lips. If, therefore, the upper labial teethin arch alignment are not protruded or retruded in relation to the bones whichform the framework of the middle features of the physiognomy, the upper lipwill also assume the desired form and pose in relation to the cheeks, malar prom- 184 PART VI. DENTO-FACIAL MALOCCLUSIONS inences, and bridge of the nose, and this is necessary for the perfection of thisportion of the facial outUnes. To complete the esthetic requirements of this ensemble of dento-facial harmony,the perfect ease and pose of the lips when closed and at rest are largely dependentupon the harmony in distance between the upper and lower jaws when closed withthe muscles
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