A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . and characterized by the relative position of the dentures andalveolar processes. In other words, the general labial and buccal surface outlineof the dentvires constitute the framework of the overlying facial contours. It ishoped, therefore, that it will not be understood that dento-facial harmony, whichis the composite type between the extremes of bimaxillary protrusions and retru- 240 PART VI. MALOCCLrSIOXS sions, is a sure indication of normal occlusion, as has
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . and characterized by the relative position of the dentures andalveolar processes. In other words, the general labial and buccal surface outlineof the dentvires constitute the framework of the overlying facial contours. It ishoped, therefore, that it will not be understood that dento-facial harmony, whichis the composite type between the extremes of bimaxillary protrusions and retru- 240 PART VI. MALOCCLrSIOXS sions, is a sure indication of normal occlusion, as has been asserted by a few prom-inent writers, any more than normal occlusion is a sure indication of dento-facial harmony. It simply means that the framework upon which the soft tissuesof the face rest and are dependent for their form and contour, is such as to producebeauty in the facial outlines, though it may be produced by quite irregular teeth. These principles are well illustrated in Fig. 165, which shows on the left andright, types of pronounced bimaxillary protrusion and retrusion, with a perfect Fig. dento-facial type above; and yet the dentures of these cases are far from nonnalin occlusion, and in the central case, with its beautiful face, a number of teeth weremissing, because of germ extinction. In the diagnosis of bimaxillary protrusions, the same rules apply as in thediagnosis of all dento-facial malocclusions. The occlusal relations of the denturesshow that they belong in Class I. The true relation of the chin is determined byexcluding from the vision the immediate protruded area in order to compare itwith the main features of the physiognomy. The relation of the lower lip to thechin, denotes that the lower denture is protruded in relation to the mandible, andwith the dentures in normal occlusion and in alignment, the upper must also beequally protruded in relation to the mandible. Therefore, if the chin is in normalrelation to the features outside of the den
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