. The science and practice of dental surgery. h may almostcertainly be prevented if thedeciduous teeth are treatedbetween four and six years ofage ; and that expansion, whennormal spacing is insufficient,also aids the prevention ofnasal stenosis and correlated deformities. In an earlier but interesting paper Barnes(20) discusses the development of the jawsduring the period of eruption of the deciduousteeth, and gives many illustrations of abnor-malities of the deciduous dentition, includingdeficient spacing, close bite, and excessive over-bite, and deficient development about theapices of the
. The science and practice of dental surgery. h may almostcertainly be prevented if thedeciduous teeth are treatedbetween four and six years ofage ; and that expansion, whennormal spacing is insufficient,also aids the prevention ofnasal stenosis and correlated deformities. In an earlier but interesting paper Barnes(20) discusses the development of the jawsduring the period of eruption of the deciduousteeth, and gives many illustrations of abnor-malities of the deciduous dentition, includingdeficient spacing, close bite, and excessive over-bite, and deficient development about theapices of the teeth. He shows clearly thefalsity of the^idea that while the permanentteeth succeed their predecessors step by step, thebone only develops intermittently around eacheruiDting tooth. There can be little doubt thatspace for the permanent teeth must be providedby bony growth at an earlier period, althoughprobably this takes place most rapidly in differentparts of the jaw, at different times, and in constitutes sectional Fig. 239.—Right upper teeth from deciduous canine tofirst permanent molar in lingual occlusion; deviationof mandible to the right. This case differs from thatshown in Fig. 238, in that the defect in the upperarch was on the same side as that to which deviationof the mandible occurred, instead of the opposite.(C. R. Fitch : Trans. ; Dental Record.) ? i Barnes is of opinion that the bony developmentof different portions of the jaws is completedat certain ages, and he therefore emphasizesthe importance of early treatment. He advisesthe forward movement of the anterior teeth 142 where spacing is insufficient at four to six yearsof age, including the movement of the roots
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
