. The science and practice of dental surgery. ted; and that extraction shouldIje symmetrical. In deciding between the lateralsand the first premolars in tlie case of outstandingcanines, attention should be given to the direc-tion and incluiation of thecanines, because movementof the crowns is compara-tively easy, and of the rootsexceedmgly difficult. Whereonly a small additional spaceis required the second pre-molars should be selected inJ (reference to the first; thefirst premolars can easilyIx- moved back sufficientlyto allow the canines toreach normal alignment. In those cases in whichthe a
. The science and practice of dental surgery. ted; and that extraction shouldIje symmetrical. In deciding between the lateralsand the first premolars in tlie case of outstandingcanines, attention should be given to the direc-tion and incluiation of thecanines, because movementof the crowns is compara-tively easy, and of the rootsexceedmgly difficult. Whereonly a small additional spaceis required the second pre-molars should be selected inJ (reference to the first; thefirst premolars can easilyIx- moved back sufficientlyto allow the canines toreach normal alignment. In those cases in whichthe aberrant tooth (or teeth)is a second premolar, itshould usually be preferred to the first. It has been pointed out that cases of thisclass are not necessarily associated withabnormal occlusion of tlie molars and pre-molars, and it is for this reason that extractionshould usually be symmetrical; but if the lowerteeth are in post-normal occlusion with theupper, and the lower incisors are imbricated,it is often good treatment to remove two upper. -Proclination upper incisors increased by eruption of canines.(O. Northcroft.) first premolars and a lower incisor, not neces-sarily selecting the one most misplaced, butpreferring an incisor misplaced labially to onemisplaced lingually, because the latter is moreeasily reduced by nature and art. In some cases where extraction is rightlypractised, natural forces will in due timecorrect the deformity, but in the greaternumber mechanical assistance should be pro-vided. In all cases the operator should have 107 regard to the state of the teeth in respect tocaries, and select carious teeth for extractionwhenever other considerations permit. It maysometimes be advisable not to extract opposingteeth but to choose, for example, a first pre-molar in one jaw and a second ua the other,and move the teeth into occlusion mechanically;or in other cases to extract two first premolarson one side and two second premolars on theother. Cases frequently occur
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
