. The science and practice of dental surgery. rimportant factors. The writer believes thatthe method here propounded of considering allpossible combinations does something stillfurther to restore order out of chaos. Of courseit will be understood that all cases do notdefinitely conform to a clear-cut type, and thatcombinations—for example, of Classes (b) and(c),or {d) and (e)—constantly occur; but it willbe found that even the most bizarre exampleof antero-posterior abnormality is but a modi- fication of degree and not of kind, and nuist ofnecessity find a place in one class or another,or in m
. The science and practice of dental surgery. rimportant factors. The writer believes thatthe method here propounded of considering allpossible combinations does something stillfurther to restore order out of chaos. Of courseit will be understood that all cases do notdefinitely conform to a clear-cut type, and thatcombinations—for example, of Classes (b) and(c),or {d) and (e)—constantly occur; but it willbe found that even the most bizarre exampleof antero-posterior abnormality is but a modi- fication of degree and not of kind, and nuist ofnecessity find a place in one class or another,or in more than one. A classification of casesof antero-posterior malocclusion somewhat simi-lar to that herein adopted has been eminciatedby Sim Wallace (165). It will now be necessary to consider each ofthese classes in detail. Class (a), Normal or Sub-normal.—Cases inthis group do not usually come withhi thescope of treatment. They are normal in allrespects, save the prominence and developmentof the mandible, but where the occlusion is not. Fiu. 201.—lulorior rotrusiou (lialf a unit on loft siilo), and procliiiationof upper central incisors, associated with very abnormal jaw forma-tion and dental hypoplasia. Retained deciduous canines. Not«the lingual inclination of lower premolars and complete lingualocclusion of those teetli on the left side. (Norman ti. Bennett.) affected the defective or excessive developmentcan be but slight, and mechanical interferenceis neither requisite nor desirable. Class (b). Inferior Retrusion.—The essentialfeatures of cases of this group are that theantero-posterior relationship of the upper archto the upper part of the face is normal and thatthe lower arch is in post-normal occlusion withthe upper arch. In the one type the mandibleand lower teeth arc both too far back; and inthe other only the teeth, the mandible appearingto be in normal relationship with the face, andthe chin not markedly receding,, as it is in thefirst type, which is by f
Size: 1636px × 1528px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
