. The Dental cosmos. num alloyed with from 7 to 10 per cent,iridium, rolled to a thickness of .003and cut in widths of .21. .19. , to be used with arch-pin tubesof .15, .13, and .10 in length respec-tively. This width of material allowsfor festooning the band (see Fig. 1) sothat the band just passes under the gin-giva; this edge should be beveled andthoroughly burnished to the surface ofthe tooth. 552 THE DENTAL COSMOS. From a prophylactic point of view,the band must cover the crown of thetooth to the gingiva, or we surely willhave etching and caries from disinte-gration of particles of
. The Dental cosmos. num alloyed with from 7 to 10 per cent,iridium, rolled to a thickness of .003and cut in widths of .21. .19. , to be used with arch-pin tubesof .15, .13, and .10 in length respec-tively. This width of material allowsfor festooning the band (see Fig. 1) sothat the band just passes under the gin-giva; this edge should be beveled andthoroughly burnished to the surface ofthe tooth. 552 THE DENTAL COSMOS. From a prophylactic point of view,the band must cover the crown of thetooth to the gingiva, or we surely willhave etching and caries from disinte-gration of particles of food that willlodge between the end of the tube, pinhead, and enamel of the tooth consideration has appealed to meso-positively, that I have replaced allof my hands, originally made of narrowhand material, with wider bands pro-tecting the tooth surface. ABOH-PIN TUBES. In soldering it to the band, the tubeshould be placed in nearly all cases in Fig. Technic model—occlusal view. the center of the crown, parallel to thelong axis of the tooth and at such adistance from the occlusal edge thatthere is room for the arch-wire to restupon the band material. Teeth that arein torsion call for the tube to be placedas near to the point of rotation as pos-sible (see Fig. 2), so that we can havethe full leverage of the arch-wire forrotating. Arch-pin tubes should be usedin such lengths that the occlusion is notinterfered with, nor the gingiva dis-turbed. Lengths of .15, .13, and .10,I find, will answer all practical pur-poses. In Fio\ 3 tubes of .15 are usedon the upper centrals, and .10 on thelaterals; owing to the long overbite, allthe six anterior lower teeth have in length. •Care in selecting the proper widthof band material, arch-pin tube and pin, ami having the occlusal margin of allbands on the same plane, will producea more artistic and less conspicuous ap-pliance. (See Fig. 4.) Fig. 3.
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Keywords: ., bookcentury1900, bookdecade1910, bookiddent, booksubjectdentistry
