A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . than it takes to describe it. 356 PART VII. UNCLASSIFIED MALOCCLUSIONS For quite young patients, the teeth will usually assume their normal positionwith little or no aid after the cause is removed. Even with much older patients, ifthis is the sole cause, and it has been thoroughly removed, very simple appliances,shown under Fig. 260, will readily close the space; also retention can be a very moderate effort. Second Character.—When abnormally wide spaces arise betwee
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . than it takes to describe it. 356 PART VII. UNCLASSIFIED MALOCCLUSIONS For quite young patients, the teeth will usually assume their normal positionwith little or no aid after the cause is removed. Even with much older patients, ifthis is the sole cause, and it has been thoroughly removed, very simple appliances,shown under Fig. 260, will readily close the space; also retention can be a very moderate effort. Second Character.—When abnormally wide spaces arise between the centrals,and occasionally between all the front teeth, for patients older than twenty-fiveor thirty years of age, and they aver that this condition is of somewhat recent date,and that the spaces seem to be gradually increasing, it is usually due to the wearingaway of masticating surfaces, which allows the jaws to come closer together witha forward movement of the entire lower denture, the latter movement being dueto the position of the tempero-maxillary articulation in relation to the occlusal Fig. plane. See Fig. 261. If this occurs with patients whose lower labial teeth naturallyshear closely to the lingual surfaces of the upper, the lower phalanx will be drivenwith gradually increasing force between the lingually inclined planes of the uppercuspids, and against the incisors, with one of three results: First, abnormal spaceswill arise between the upper front teeth—commonly between the centrals alone;second, protrusion of the upper front teeth; and third, crowded malalignments ofthe lower incisors. In many instances the space between the upper centrals hasbecome so wide that dentists have filled it with an artificial tooth. While it is not difficult to close the spaces between the upper front teeth withcontracting arch-bows, or with elastics and ligatures, as illustrated, it is impossibleto permanently retain them without removing the cause, except by a permane
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