. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . / ^ ■/ / Fig. 178.—Folding the ribbon. the cylinder by the width of the ribbon. Various sizes andlengths are required, depending on the size and depth of thecavity. Gold cylinders in both cohesive and non-cohesiveforms are also prepared ready for use by the manufacturer(Fig. 179). 5. The Cushion or Mat.—Fold a ribbon lengthwise uponitself with a spatula, until made into a mat or cushion. The 142 FILLING MATERIALS size will depend on the size of the cavity, and may be variedby regulating t
. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . / ^ ■/ / Fig. 178.—Folding the ribbon. the cylinder by the width of the ribbon. Various sizes andlengths are required, depending on the size and depth of thecavity. Gold cylinders in both cohesive and non-cohesiveforms are also prepared ready for use by the manufacturer(Fig. 179). 5. The Cushion or Mat.—Fold a ribbon lengthwise uponitself with a spatula, until made into a mat or cushion. The 142 FILLING MATERIALS size will depend on the size of the cavity, and may be variedby regulating the width of the ribbon, the amount of goldused and the number of folds. Another Method.—Roll a cylinder on a flat-sided Fig. 179.—Making the cylinder. The broach and cylinder are shown much enlarged. and then, after withdrawal from the broach, flatten it more;or roll the cyhnder as usual and flatten into a of Tin. I. Non-conductivity. (Lowest of all the metals.) CHARACTERISTICS OF TIN I43 2. Ease of introduction. (Works rapidly when non-cohesive.) 3. AdaptabiHty to cavity walls. 4. Therapeutic action. (Supposed by some to preventdecay.) 5. Capability of polish. (It takes a high polish, but doesnot retain it.) Disadvantages. 1. Inharmonious color. (Oxidizes and darkens readily.) 2. Lack of crushing resistance and edge strength. 3. Flow. 4. Disintegrates in the fluids of the mouth. Tin is still used by some operators for filling cavities inchildrens teeth on account of its ease of introduction andsupposed therapeutic effect; also in rapid caries on surfacesunexposed to \dew and mastication. It is too soft to besubjected to the forces of occlusion in permanent teeth. Asthe method of worki
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