Hygiene, dental and general . the roots of the teeth as they develop afterthe eruption of their crowns and is removed by the processof absorption after the loss of any tooth. It follows, there-fore, that after the premature loss of a tooth and the removalof its supporting process, no stimulus remains for bone devel- 20 HYGIENE: DENTAL AND GENERAL opment; the continuity of the entire arch is broken and theteeth tend to drift in the direction of least resistance. Thisresults inevitably in the loss of the normal relationship be-tween the approximating surfaces of the teeth of each jawas well as t
Hygiene, dental and general . the roots of the teeth as they develop afterthe eruption of their crowns and is removed by the processof absorption after the loss of any tooth. It follows, there-fore, that after the premature loss of a tooth and the removalof its supporting process, no stimulus remains for bone devel- 20 HYGIENE: DENTAL AND GENERAL opment; the continuity of the entire arch is broken and theteeth tend to drift in the direction of least resistance. Thisresults inevitably in the loss of the normal relationship be-tween the approximating surfaces of the teeth of each jawas well as the occlusal relationships of the teeth in opposingjaws. Serious deformity may follow. Smith has shown {Journal of the Allied Dental Societies,Vol. I, April, 1906) that in certain cases of malocclusion thetimely and well judged extraction of teeth may result bene-ficially by relieving the crowded condition. The tendency ofthe drift may then bring the surfaces of the remaining teethinto positions closely simulating the Fig. 1.—Model illustrating normal occlusion. Orthodontia.—We agree with Johnson that the attainmentof the ideal normal occlusion of the teeth by orthodonticinterference is not always possible and in many cases anattempt to bring this about will result in an inharmony inthe relationship of the teeth to the general contour of thebony and muscular structures of the face which nature willnot tolerate. Not only will it be impossible to retain the teethin their new position, which is an abnormal one, but theremay ultimately result a deformity more objectionable thanthe original condition. Extensive orthodontic treatment DENTAL HYGIEXE 21 should be undertaken only after a careful study of all pre-vailing conditions by one whose vision is not limited to theteeth alone. It is futile to attempt to permanently establishideal normal occlusion when all the forces of nature are beingexerted to maintain the position of the teeth in their relation-ship to the organism
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecthygiene, bookyear1920
