A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . as can be easily determined by diagnosis, the case onthe left is an upper protrusion, caused by the malrelations of the labial teeth dueto thumb-sucking; that in the middle is an upper retrusion due to inhibited in-cisive maxillary development; and that on the right is a bimaxillary protrusiondue to heredity. CHAPTER XXI. DIAGNOSIS AND TREATMENT 191 In Classes II and III, there will also be found quite different characters anddemands of treatment, though they will have the same
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . as can be easily determined by diagnosis, the case onthe left is an upper protrusion, caused by the malrelations of the labial teeth dueto thumb-sucking; that in the middle is an upper retrusion due to inhibited in-cisive maxillary development; and that on the right is a bimaxillary protrusiondue to heredity. CHAPTER XXI. DIAGNOSIS AND TREATMENT 191 In Classes II and III, there will also be found quite different characters anddemands of treatment, though they will have the same disto-mesial occlusalmalrelations of the buccal teeth. This may be illustrated by a careful examinationof the beginning facial and dental casts of five cases in practice from Class II,shown in Fig. 126. The lower buccal teeth in all these cases are in full distal mal-interdigitating occlusion in relation to the uppers, and yet their dento-facial diag-noses are briefly as follows: Case A is an upper coronal protrusion. Case B is anupper bodily protrusion. Case C is an upper coronal protrusion and lower Fig. bodily retrusion. Case D is an upper coronal protrusion and upper apical retru-sion. Case E is a lower bodily retrusion. Before a formal consideration of the principles of dento-facial diagnosis ofmalocclusion, according to Classes, it would be well for the student to rememberthat every one of the so-called unclassified, or locally caused characters, whenregarded individually in a clinical examination at the chair, must all fall into oneor the other of the three Classes, in accord with the buccal occlusion that is , in a case which presents for treatment, if it seems to be mainly charac-terized by some special form of irregularity, it is important to first determine theClass to which the case belongs, by a careful examination of the buccal occlusion,particularly the first molars, and then by a comparison of the different zones ofthe dento-facial area with
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