Notes on the treatment and filling of teeth / by Wm. Cass Grayston.

  • Grayston, William Cass.
Date:
1904
Catalogue details

Licence: In copyright

Credit: Notes on the treatment and filling of teeth / by Wm. Cass Grayston. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    form of gold for producing accurate adaptation and great density. Pellets or cylinders in the cohesive or semi-cohesive state should be loosely rolled. The best cylinders for cohesive or semi-cohesive work are those purchased ready-made. As a rule they are made of very thin gold, and the smaller sizes, by reason of their deHcacy, should be particularly applicable against cavity walls when hand pressure is used. Cylinders—probably owing to the ex- tremely thin foil of which they are made—are not so rehable as foil, inasmuch as their quality seems to vary. There is very rarely any trouble with foil in this respect, but it is not uncommon to find one bottle of cylinders work perfectly, and the next one prove most unsatisfactory when the gold is annealed. Heavy foil, such as No. 30 or No. 60, is principally useful for surfacing fillings, although some operators use the No. 30 heavy foil in strips of single thick- ness for filling large cavities. In using heavy tape, such as single strips of heavy foil or the lighter foil folded mto a heavy tape, it is usually necessary to pack each layer flat, by attaching one end to the gold already in place, and then carefully folding the strip backwards and forwards on itself, layer by layer, taking care to weld each layer absolutely flat to the already condensed gold. If thin tape, such as four folds of No. 4 foil (producing No. 16), is