A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . rst w^ith a slight deflection is probably further enhanced by theforces of eruption and development of the root. This would seem to be true inthose frequent cases of impacted upper cuspids which lie imbedded nearly or quiteparallel to the occlusal plane and with their crowns just back of the incisor roots;this would indicate that the malinclination had principally if not wholly occurredbefore the roots were developed, and that the resorptive, eruptive, and developingforces had a
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . rst w^ith a slight deflection is probably further enhanced by theforces of eruption and development of the root. This would seem to be true inthose frequent cases of impacted upper cuspids which lie imbedded nearly or quiteparallel to the occlusal plane and with their crowns just back of the incisor roots;this would indicate that the malinclination had principally if not wholly occurredbefore the roots were developed, and that the resorptive, eruptive, and developingforces had all tended to carry the tooth forward along the misdirected line of itsgrowth. See Fig. 269. In a very large proportion of the impactions of lower third molars, they lie in adecided mesial inclination, frequently parallel with the occlusal plane, and with their 364 PART VII. UNCLASSIFIED MALOCCLUSIONS occlusal surfaces resting against the distal surfaces of the roots of the second molars,and frequently with the points of the cusps locked in the disto-cervical depressions,as shown in Fig. 270. Fig. 270. Fig. Two impacted canine teeth. (Cryer) An impacted second premolar and a third molar. (Cryer) In Fig. 271 is most perfectly illustrated one of the possibilities which mayarise with impacted third molars. When first lower molars are moved distally at an early age, the crowns of thesecond molars, whose roots may not be wholly calcified, are pressed back with an Fig. 271.
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