A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . t alsoto that most important of all objectives—permanency of retention. 259 260 PART VI. DEXTO-FACIAL MALOCCLUSIONS Like nearly all cases which possess this decided disto-mesial malocclusion,they arise through some form of heredity, and consequently they early establishtheir maUnterdigitation of buccal cusps. In those cases which are truly diag-nosed as upper protrusions, why disturb a buccal occlusion (except to makeslight necessary adjustments laterally and disto-mesially) whi
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . t alsoto that most important of all objectives—permanency of retention. 259 260 PART VI. DEXTO-FACIAL MALOCCLUSIONS Like nearly all cases which possess this decided disto-mesial malocclusion,they arise through some form of heredity, and consequently they early establishtheir maUnterdigitation of buccal cusps. In those cases which are truly diag-nosed as upper protrusions, why disturb a buccal occlusion (except to makeslight necessary adjustments laterally and disto-mesially) which answers all thepurposes of mastication? Frequently, the only treatment required is a lingualinclination movement of the six front teeth, and the case is ready for theretainer. By the other method, which premises that no teeth should be extracted, thecase is supposed to be corrected by shifting both dentures disto-mesially to a normalocclusion with the intermaxillary force. Think of this for a moment. If the facialdeformity is due solely to a protrusion of the upper denture, as it is likely to be, Fig. the perfect correction of the facial outlines can be accomplished only by a pro-portioiiate retrasive movement of the entire upper denture. Even if such an extensivemovement were possible, as it may be for young children,—provided a sufficientstationary anchorage can be established to prevent the lower denture from movingforward—that position would not be retained, because the oncoming second andthird molars would in all probability force the upper denture forward again to itstrue inherited malposition. Such an extensive distal movement, however, is probably never accomplishedor even expected in the usual operation of shifting the dentures to normal. Whatis accomplished, and what Dr. Angle advocated as his method, is to move thelower mesially one-half the width of a cusp, and the upper distally the same dis-tance, so that the cusps will occlude normally. Nor could t
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