A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . reas, the facial outlines—which are theonly true medium of diagnosis—tell a far different story. In comparing the facial outlines of the main characters of Divisions 1 and 2of this Class, the chin in all the Types is in normal dento-facial relation, or nearly 246 CHAPTER XXX. INTRODUCTION TO CLASS II 247 so. In Type A of Division 1, illustrated on the left of Fig. 169, the lower lip—-particularly the labio-mental area—is decidedly retruded in relation to the chin;while in Divisi
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . reas, the facial outlines—which are theonly true medium of diagnosis—tell a far different story. In comparing the facial outlines of the main characters of Divisions 1 and 2of this Class, the chin in all the Types is in normal dento-facial relation, or nearly 246 CHAPTER XXX. INTRODUCTION TO CLASS II 247 so. In Type A of Division 1, illustrated on the left of Fig. 169, the lower lip—-particularly the labio-mental area—is decidedly retruded in relation to the chin;while in Division 2, illustrated on the right, it is in esthetic outline. In Type Aof Division I, the upper lip is not materially protruded, if at all, in relation to theadjoining facial outhnes; while in Types A and B of Division 2, the upper lip isdecidedly protruded. A not uncommon Type of Class II is a retruded position of the chin in relationto dento-facial harmony. This always emphasizes the facial disharmony andincreases the difficulties of diagnosis and treatment of all of the dominant characters Fi<;. with which it occurs. See Fig. 170. As this occurs in both Divisions 1 and 2,it is placed with Concomitant Characters of Class II where the general principlesof treatment will be found. As one advances in the study and practice of orthodontia, he realizes moreand more fully the unreliability of depending upon the disto-mesial relations ofbuccal occlusion as a basis in determining the character and treatment of mal-occlusions. This is most perfectly and repeatedly exemplified in Class II Mal-occlusions, which are characterized dentally by a pronounced distal malocclusionof the lower denture in relation to the upper. But in a dento-facial diagnosis,the different characters are found to contain every gradation in character whichlies between the extremes of a pronounced retrusion of the lower with the uppernormal, and a pronounced protrusion of the upper with the lower norm
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