Dental cosmos . uccal to lingual face. Bothare deflected away from themedian line, the posterior moreso than the anterior, and eachis grooved upon its anteriorand posterior surface. The bi-furcation is prolonged, on boththe buccal arid lingual aspects,in the form of a groove, whichextends nearly to the gummargin. Viewed antero-pos-teriorly, both roots are nearlycentral with the crown. The tooth is set in the jawwith a forward and inward in-clination of the crown, the rootsstanding in the line of the forceapplied as in crushing. Plate N.—Inferior SecondMolar. The square, solid form isagain appa
Dental cosmos . uccal to lingual face. Bothare deflected away from themedian line, the posterior moreso than the anterior, and eachis grooved upon its anteriorand posterior surface. The bi-furcation is prolonged, on boththe buccal arid lingual aspects,in the form of a groove, whichextends nearly to the gummargin. Viewed antero-pos-teriorly, both roots are nearlycentral with the crown. The tooth is set in the jawwith a forward and inward in-clination of the crown, the rootsstanding in the line of the forceapplied as in crushing. Plate N.—Inferior SecondMolar. The square, solid form isagain apparent in the secondmolar. Both in the buccal andapproximal views it bears aclose resemblance in generalform to the first. Its crown hasa more rounded contour, andhas only four cusps, the longestof which is the anterior lingualand the shortest the posterior buccal. The sectional views showthat the greatest thickness is on a line (3) just above the gummargin. The enamel line is longest 0n the buccal face. The two. 608 THE DENTAL COSMOS. roots are about equally inclined away from the median line. Theanterior is noticeably thicker from buccal to lingual face, and blunterpointed, than the posterior. The longitudinal groovings are the sameas in the first molar. The tooth is placed in the jaw similarly to the first molar, so asto bring the crown in the line of the applied force. Plate O.—The Teeth in the Arches and in Occlusion. The teeth are so arranged in the jaws that the crowns do notocclude on a straight line. Both arches have a decided dip ordepression, the greatest dip being between the first and second Arrangement of the 0*
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Keywords: ., bookauthor, bookcentury1800, bookdecade1880, booksubjectdentistry
