A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . thentreat the case according to its demands. All of this is fully outlined in the diag-nosis and treatment of Class II, where it will be found. Notwithstanding the fact that the malrelations of the dentures are the same,there is a very decided difference in the facial outlines which .they produce, and 215 216 PART VI. DENTO-FACIAL MALOCCLUSIONS consequently a very decided difference in the character of treatment they instance, if the maleruption of the cuspids has occ
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . thentreat the case according to its demands. All of this is fully outlined in the diag-nosis and treatment of Class II, where it will be found. Notwithstanding the fact that the malrelations of the dentures are the same,there is a very decided difference in the facial outlines which .they produce, and 215 216 PART VI. DENTO-FACIAL MALOCCLUSIONS consequently a very decided difference in the character of treatment they instance, if the maleruption of the cuspids has occurred in a case of Class II,in which the distal malrelation of the lower denture is due to its retruded positionin relation to the mandible, causing a pronounced retrusion of the lower lip in rela-tion to a normally posed chin, the extraction of premolars to correct the cuspidmalposition would be decided malpractice. But on the other hand, if the lowerlip and chin are normally posed, it indicates that the case is an inherited upperprotrusion demanding the extraction of premolars to align the cuspids. Fig. In Fig. 142 is showr a case which would have been a pronounced upper protru-sion with lower nom A had it not been that the maleruption of the cuspids per-mitted a retrusive movement of the incisors through the action of the upper patient being twenty years of age had established a perfect interdigitatingocclusion of the buccal teeth, as shown on the left. The result of treatment byextracting the first premolars is shown on the right. Originally, the lips of this patient were somewhat protrusive, which wouldhave been decidedly enhanced had there been an attempt to shift the dentures to anormal occlusion without extraction. Hundreds of cases of this particular character were perfectly corrected bydentists in the past with no other treatment than the extraction of the first pre-molars, and as mentioned before, this was one of the reasons which led to the fre-quent
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