. The science and practice of dental surgery. lapping upper deciduous central incisors. (G. Northcroft.) ^ _r cover a good many cases (see Figs. 229,2S0, 231).The successfid treatment by inter-maxillaryforce of such a case due to adenoids is recordedby Guilhermena P. Mendell (116) (see Figs. 232,233); the subsequent development of this case(117) was not so satisfactory as might havebeen expected; but, as G. P. Mendell remarks,this was very likely due to the adenoids havingbeen allowed to remain because they weresmall in amount. The usual feature is a gradual development ofa condition in which
. The science and practice of dental surgery. lapping upper deciduous central incisors. (G. Northcroft.) ^ _r cover a good many cases (see Figs. 229,2S0, 231).The successfid treatment by inter-maxillaryforce of such a case due to adenoids is recordedby Guilhermena P. Mendell (116) (see Figs. 232,233); the subsequent development of this case(117) was not so satisfactory as might havebeen expected; but, as G. P. Mendell remarks,this was very likely due to the adenoids havingbeen allowed to remain because they weresmall in amount. The usual feature is a gradual development ofa condition in which each molar occludes whoUyand solely with the corresponding tooth in theujjper jaw. It is natural to correlate this defectith the insufficient anterior spacing, and it seemsobvious that insufficient growth takes jDlace atthe condyle and angle of the mandible as wellas in other parts of both ja«s. There may alsobe insuificient transverse development of theupjjer arch, which, as has been said, shouldnormally increase in width during the period. Fig. 228.—Rotation and Ungual displacement of rightlower lateral deciduous incisor. (G. Northcroft.) of the deciduous dentition, and it is probablethat the factor of mouth-breathing and nasalstenosis enters thus early into many of thesecases. In considering this gradualdevelopraent \_ 137 of faulty molar occlusion it must be rememberedthat the crowns of the deciduous molars haveflatter surfaces and smaller cusps than thepermanent teeth, and that interlocking scarcelyexists, especially after wear of the cusps. Credit is due to G. Northcroft(119) for emi^hasizing the import-ance of seeking the commencementof what will be a post-normalocclusion of the permanent teethin faulty occlusion of the decidu-ous molars. Among twenty casesof abnormality in the deciduousdentition before the eruption ofthe first permanent molars, hefound six cases showing post-normal occlusion. He furtherpoints out that the average medio-distal width of the lower decid
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
