. The science and practice of dental surgery. sually correlated with deficientanterior development and malalignment of the incisorsalready described. It should be remembered that the apparentlyerring tooth is often really out of positionthan its neighbours. The order of eruption has less influence onthe character of the deform-ity than in the cases pre-viously described as beingdue to forward translationof molars. If the secondpremolars erupt before thecanine the malposition ofthe canine will the morecertainly be produced. Ifthe canine erupts first thedeformity produced will de-pend to s
. The science and practice of dental surgery. sually correlated with deficientanterior development and malalignment of the incisorsalready described. It should be remembered that the apparentlyerring tooth is often really out of positionthan its neighbours. The order of eruption has less influence onthe character of the deform-ity than in the cases pre-viously described as beingdue to forward translationof molars. If the secondpremolars erupt before thecanine the malposition ofthe canine will the morecertainly be produced. Ifthe canine erupts first thedeformity produced will de-pend to some extent on theamount of space availablefor it. Where this is quiteinsufficient the effect will be as just described, but\\here the encroachment has been but small, theforce of eruption of the canine may be sufficientto move the adjacent teeth. In tliis way, by aslight backward movement of the first premolar,the second premolar may be prevented fromcoming into normal alignment and normal occlu-sion with its opponent, and nnist erupt on the. Fig. 173.—Buccal displacomenl of right canine due todeficient anterior development. {Norman ) buccal or lingual aspect, more usually the of a premolar from this cause is,however, probably far less common than thesame abnormality associated with forwardtranslation of molars (see Fig. 176). The teeth more frequently influenced by the 105 enipting canine are the incisors. In the caseof the upper teeth tlie two typical conditionspreviously described, namely, rotated centrals,or rotated laterals overlapping the centrals,are often accentuated. But it is very doubt-ful whether a typical laterally contracted or V-shaped arch is ever produced at this periodunless there has previously been a small defor-mity of the kind (see Figs. 177, 178, 179). The question of the relative influences ofinheritance and environment in contributingto this and other conditions has already beendiscussed, and although it seems clear that t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
