. The Dental cosmos. is is usually the stronger;or a single straight post may be used, asmentioned in Chapter IY. Whatever method is employed, caremust be observed to hollow out the baseof the pulp chamber and the entranceto the root-canals, with a view to ac-commodating the junction between thepost and the bend in the case of a singlepost, so that it does not rise above thegeneral level of the surface of the root(Fig. 79), otherwise it would be neces-sary to hollow out more than is desirableof the base of the crown, which in conse-quence would be unduly weakened (). The pure gold cap is
. The Dental cosmos. is is usually the stronger;or a single straight post may be used, asmentioned in Chapter IY. Whatever method is employed, caremust be observed to hollow out the baseof the pulp chamber and the entranceto the root-canals, with a view to ac-commodating the junction between thepost and the bend in the case of a singlepost, so that it does not rise above thegeneral level of the surface of the root(Fig. 79), otherwise it would be neces-sary to hollow out more than is desirableof the base of the crown, which in conse-quence would be unduly weakened (). The pure gold cap is now to beburnished into the depression made be-fore the post is soldered, and if by 936 THE DENTAL COSMOS. accident this should be torn or split andso made too large, a hole should bepunched with a rubber dam punch in asmall piece of pure gold, which shouldbe slipped over the post and burnishedto place so as to fill up the gap. Thepost and cap are then to be removed inthe manner described in the case of the Fig. Showing upper molar with gum receded,exposing buccal roots. front teeth. Or, if preferred, a verysmall impression in plaster or dentallac may be taken of cap and post, andthese removed and soldered in the usualway. Coming now to the upper molars, thefitting of bands for these may be carriedout by one of the methods already de-scribed. There is, however, a type ofmolar root, both upper and lower, which Fig. 82.
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