Excerpt from The Dental News Letter: A Quarterly Publication; Volumes II, III, IV and V
Gentlemen - The favorable reception that my first communi cation has received, is a sufficient apology for me to furnish you with a continuation of my last article on The Formation of the ... Cavity for Plugging. For this purpose, numerous small cutting instruments are necessary, not only to approach all parts of the cavity of decay, but to enlarge it in any desirable direction; for it is not to be presumed that the freaks of decay will always form a cavity best suited to retain a plug; besides, gold foil cannot be consolidated, unless as fast as placed in the cavity, it is embraced by its parieties more and still more firmly at every effort with the instrument. Yet it is not indispensable that it should do so in every direction, or when only the first portions of the plug are introduced. A very good and simple method for a young learner to adopt, when he has dressed the margins of the cavity, is to lay a straight instrument across them, and then to cut down at right angles from it; in this way he is sure to give the cavity a proper shape; in short, it is the business of the dentist to shape the cavity to suit himself, so far as it can be done without injuring the tooth. A cavity best suited for plugging is where the parieties run from the orifice to the bottom, parallel to each other; and this character should always be obtained as far as practicable upon the coronal extremities of the teeth, especially when they are disposed to wear down. What are commonly termed the hatchet-shaped, and scoop or hoe-shaped instruments, of different sizes, bent at different angles, are necessary; they can be obtained ready made, but every dentist should be capable of shaping the points and tempering them to suit himself; it is impossible for the instrument maker to judge of and produce the various niceties of temper and shape which these instruments require. Small flat drills, for drilling catches for the plug upon different parts of the cavity where they can be applied, are also requisite. The follow ing is a very easy and effectual method of tempering this kind of instruments - first file and bend the instrument suitably, then beat it a very little above a cherry-red in the ¿ame of a spirit lamp.
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