. The Dental cosmos. The arch at five years was mm. narrower-half years. cases, if treatment is begun at from eightto ten years of age or later, may not beso yielding to treatment, and may resultin too full expansion, or the alternative, extraction. ARCH CALCULATION AS AN INDICATOR FORPROPER AMOUNT OF EXPANSION. The intelligent use of this calculatedarch will indicate the amount and direc-tion of expansion. It must be used asa coronal alignment arch only, the incli-nations of the teeth and the palatal archindicating the size and shape of the apicalarch, which should be proportionatelyf
. The Dental cosmos. The arch at five years was mm. narrower-half years. cases, if treatment is begun at from eightto ten years of age or later, may not beso yielding to treatment, and may resultin too full expansion, or the alternative, extraction. ARCH CALCULATION AS AN INDICATOR FORPROPER AMOUNT OF EXPANSION. The intelligent use of this calculatedarch will indicate the amount and direc-tion of expansion. It must be used asa coronal alignment arch only, the incli-nations of the teeth and the palatal archindicating the size and shape of the apicalarch, which should be proportionatelyfull, the apical arch outlining the apices 10 THE DENTAL COSMOS. of the roots. The dental arch may befully attained, and still be too far ante-rior or posterior in relation to the restof the skull. This must be understoodand considered. The calculated archtherefore, as demonstrated, is the smallestarch into which the teeth may erupteasily—its posterior placing may meansecond or third molar impactions with Large cranial and small maxi is wedging or impaction; each tooth asit erupts encroaches a little on the terri-tory of the next posterior tooth. If thepermanent teeth are small in proportionto the deciduous ones, but little evil mayresult, but if the permanent teeth are ofnormal or greater size, the impactionmay be severe anteriorly to the first mo-lars, or become apparent only later in the 11.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentist, bookyear1912
