. The science and practice of dental surgery. ted in the compara-tively rare instances of successful back^\ardmovement by occipital force, and for\\ardmovement by inter-maxillary force; thesemethods Mill be dLscussed in connection Aviththe examples to which they may be (43, p. 176) defines the dento-facialarea , which it is possible to modify by move-ment of teeth, as being formed by the upperand lo^^?er lips, and lower ijortion of the nose,bounded laterally by the nasolabial folds and It is undeniably true thatform one of the chief and the most expressiveand that the position
. The science and practice of dental surgery. ted in the compara-tively rare instances of successful back^\ardmovement by occipital force, and for\\ardmovement by inter-maxillary force; thesemethods Mill be dLscussed in connection Aviththe examples to which they may be (43, p. 176) defines the dento-facialarea , which it is possible to modify by move-ment of teeth, as being formed by the upperand lo^^?er lips, and lower ijortion of the nose,bounded laterally by the nasolabial folds and It is undeniably true thatform one of the chief and the most expressiveand that the position ofthe subjacent teeth and bone affects to a con-siderable degree the contour of the lips in reposeand the potentiality of expression of the lipsin movement. It is remarkable to what extentthe facial harmony and beauty of the individualmay be modified by a comparatively slightmovement of the croons or roots of the anteriorteeth. Case (43, p. 177) shows clearly the below by the chui the mouth and lipsfeatures of the faceof transient emotion;. Fig. 196.—Normal type, showing points of measure-ment (in tlie same plane). Mandibular angle, 115°;profile angle, 75°. Note that the facial line isalmost parallel with the ramus. Contrast thiswith Figs. 198, 199, and 200, in which the corre-sponding lines converge in descent. (W. Rushton :Trans. ; Dental Record.) parts affected by different kinds of movementby dividing the dento-facial area into fourzones, the upper apical and coronal, and thelower coronal and apical, the two former beingmodifiable by movement of the roots and crowns of the u]iper teeth respectively, andthe two latter by similar movements of the lowerteeth (see !). Careful observation andjudgement are re(juu-ed in determining the ex-tent to which an unperfect facial contour is
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
