The Dental cosmos . ain no history indicate by the existing relations thatthe cause was wholly in the upper arch,and the fact of the condition being moremarked at the median line and diminish-ing gradually would likewise seem to WEEKS.—THREE ORTHODONTIA CASES. 151 point to the maxilla as the initial etio-logical factor. The author is of theopinion that some change had taken placein the sutures, and, to substantiate this,a radiograph shows distinctly an incom-plete union between the halves of themaxilla at the median suture. The causewould seem to be indicated by the con-ditions existing in the
The Dental cosmos . ain no history indicate by the existing relations thatthe cause was wholly in the upper arch,and the fact of the condition being moremarked at the median line and diminish-ing gradually would likewise seem to WEEKS.—THREE ORTHODONTIA CASES. 151 point to the maxilla as the initial etio-logical factor. The author is of theopinion that some change had taken placein the sutures, and, to substantiate this,a radiograph shows distinctly an incom-plete union between the halves of themaxilla at the median suture. The causewould seem to be indicated by the con-ditions existing in the mouth. It is tobe noticed that the intercusping of the bodily, and its progressing evenly wouldseem to indicate that a movement of thealveolar process, if not of the maxillarybone, has occurred. The degree of suc-cess of the treatment is indicated bythe second photographs (Figs. 4 and 5),and by the photo-engraving of the casttaken at the completion of the work.(Fig. G.) Case II. This was the case of a bov Fig. teeth on the right side is normal, whileon the left side the teeth had been, andwere now in the posterior part of themouth, occluding with the cusps end-to-end. Such a condition would bring agreater degree of pressure on the left sideduring mastication, and would be suffi-cient, the writer believes, to account forall the subsequent changes. The treatment consisted in expandingthe arch so that it would properly occludeoutside of the lower arch. It was neces-sary to accomplish this not only to allowfor the proper relation of the upper andlower teeth, but also to retain the properrelation of the planes of occlusion be-tween the lateral halves of the arch. Theelongation of the teeth of the upper leftlateral half of the arch was carried out fourteen years of age. It is a case of ClassI, in which the irregularity was caused bvthe entire absence of the upper rightlateral incisor and by the abnormal shapeand size of the upper left lateral posterior teeth were p
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