Dental review; devoted to the advancement of dentistry. . which the patient, illclosing his teeth naturally, shut together the cutting edge of theincisors, and in doing so the articulating surfaces of the bicuspidsand molars lacked about one-eighth of an inch of touching. Inorder to masticate he protruded the lower jaw, so that the inferiorincisors closed outside of the superiors, and that was his normal 848 THE DENTAL REVIEW, articulation for use. The patient was thirty years old, and it wasargued that if the bite could be jumped it would have been jumpedin this case, where there was every re
Dental review; devoted to the advancement of dentistry. . which the patient, illclosing his teeth naturally, shut together the cutting edge of theincisors, and in doing so the articulating surfaces of the bicuspidsand molars lacked about one-eighth of an inch of touching. Inorder to masticate he protruded the lower jaw, so that the inferiorincisors closed outside of the superiors, and that was his normal 848 THE DENTAL REVIEW, articulation for use. The patient was thirty years old, and it wasargued that if the bite could be jumped it would have been jumpedin this case, where there was every reason for him to close in frontall the time, and he did so whenever he masticated. He had notaccomplished a permanent jumping of the bite.* A gentleman brought Case IV to me with the inquiry: Whydoes my son not close his mouth like other children? When hecloses the teeth in mastication he moves the entire jaw forward, butit falls back again. The former case closes forward by necessityand the latter by habit, but in both cases the instability of the con-. Fig. 7. dyles in the glenoid fossae is not unlike that produced by the jump-bite-plate. Fortunately, in the Royal Museum in Dresden, I found twoskulls which, in age and character of occlusion, corresponded inevery detail to the cases mentioned above. In both subjects theglenoid cavities presented a flattened surface extending anteriorlyand downward the distance the condyles were forced forward anddownward in masticating occlusion of the jaws. These observa-tions are indirectly corroborated by the statement of Mr. Tomes, * Trans. Worlds Col. Dent. Cong., Vol Tt. OR1GIXAL COMMUXICA TIOXS. 849 that the form of the glenoid cavity bears an intimate relation tothe dentition of the animal, and the nature and extent of the move-ment of its If it were possible to acquire the habit whereby the jaw could; be held in a fixed forward position, the jump-bite-plate would meetevery requisite to accomplish the operation, but from a study
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1901
