Dental cosmos . re-quirements having been attended to, the next step is the propershaping of the tooth or root. Smooth, level, parallel sides facilitatethe adjustment of the gold crown, the collar section of which mustbe accurately adapted. To this end the root and so much of thenatural crown as remains are trimmed with files, corundum disks,and wheels until the sides are as nearly as possible Jongitudinallyparallel. At the approximal sides sufficient of the tooth-substanceshould be cut away to allow a free space between the artificial crown THE DENTAL COSMOS. and the adjoining teeth at the ce
Dental cosmos . re-quirements having been attended to, the next step is the propershaping of the tooth or root. Smooth, level, parallel sides facilitatethe adjustment of the gold crown, the collar section of which mustbe accurately adapted. To this end the root and so much of thenatural crown as remains are trimmed with files, corundum disks,and wheels until the sides are as nearly as possible Jongitudinallyparallel. At the approximal sides sufficient of the tooth-substanceshould be cut away to allow a free space between the artificial crown THE DENTAL COSMOS. and the adjoining teeth at the cervical portion for the gum septaIf less than one-half the length of the natural crown remains, itshould be built up, or a post should be inserted to afford a securesupport for the artificial crown. Posts of iridio-platinum or silverwire, with their points fitted and cemented in the root-canals, willserve to support the crown or furnish a hold for the amalgam ( and 16). Fig. 1). Fig. 16. Fig. 17. Fig. When the natural tooth is decayed beyond the gum-margin, itshould be restored with amalgam (Fig. 17) so as to permit the partto be properly shaped as before described. It is understood thatwhen amalgam is used for such purposes it is to be allowed to setbefore the adjustment of the crown is proceeded with. In the typical case taken for illustration, the natural crown whenprepared for the reception of the gold crown appears as shown in Fig. 19. Fig. 20. Fig. 21.
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Keywords: ., bookauthor, bookcentury1800, bookdecade1880, booksubjectdentistry
