The Dental cosmos . the beautiful dense structure, which alsocauses such fillings to look exceedinglypretty. Cavities. Guttmann classifies his fill-ings into three classes: (1) The central ground filling—namely, where a complete circular mar-gin prevails, as Fig. 15. (2) The nearly central filling—namely, the margin formed is more thana semicircle, as Fig. 16. (3) The non-central—namely, themargins are a semicircle or less than asemicircle, as Fig. IT. In Fig. 18, where the cavity overlapsthe area of change of color present inthe natural tooth, it is difficult to ob- . Fig. Allens system.

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The Dental cosmos . the beautiful dense structure, which alsocauses such fillings to look exceedinglypretty. Cavities. Guttmann classifies his fill-ings into three classes: (1) The central ground filling—namely, where a complete circular mar-gin prevails, as Fig. 15. (2) The nearly central filling—namely, the margin formed is more thana semicircle, as Fig. 16. (3) The non-central—namely, themargins are a semicircle or less than asemicircle, as Fig. IT. In Fig. 18, where the cavity overlapsthe area of change of color present inthe natural tooth, it is difficult to ob- . Fig. Allens system. Here let me deviatesomewhat. The Allen system is practi-cally the same as Guttmanns, except that Fig. 15. Fig. 16. Fig. 17. a b c

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