The Dental cosmos . n he changes hiscounty ? Dr. Carr. He must register in every county in which he practices. Dr. Carr was instructed by resolution to endeavor to procure anamendment to the law by which all dentists in the State shall be ex-empt from jury duty. Dr. A. P. Burkhart, of Dansville, then read a paper on the subject of Tin and Gold in Approximal Cavities. Superior incisors and cuspids which directly occlude with the in-ferior teeth and are thus worn or abraded squarely upon their cutting-ends, are frequently found to be approximately carious, and thereforepresent peculiar difficult
The Dental cosmos . n he changes hiscounty ? Dr. Carr. He must register in every county in which he practices. Dr. Carr was instructed by resolution to endeavor to procure anamendment to the law by which all dentists in the State shall be ex-empt from jury duty. Dr. A. P. Burkhart, of Dansville, then read a paper on the subject of Tin and Gold in Approximal Cavities. Superior incisors and cuspids which directly occlude with the in-ferior teeth and are thus worn or abraded squarely upon their cutting-ends, are frequently found to be approximately carious, and thereforepresent peculiar difficulties in the preparation and filling of the cavitieswith gold. Such teeth appear proportionately short because of theloss of substance from their cutting-edges, which are thick and usuallyshow a considerable stripe of dentine between the labial and lingualplates of enamel. In the case represented by Fig. i it will be observed that the ap-proximal cavity extends from near the gum margin well down toward Fig. i. Fig. the cutting-edge, and that there the uncovered dentine is so thin atthe mesial approximal corner that an anchoring pit, such as is usuallymade, would be an additional element of weakness for two reasons :first, the remaining corner is often found, on critical examination witha magnifying glass, to be checked, and the pit would involve a lossof the enamel retaining dentine at that point; and second, the liabilityof fracture by continued wear upon the unprotected corner would beincreased by an anchorage pit. My method of procedure in such a case is to prepare the upper UNION CONVENTION IN ROCHESTER, N. Y. 53 portion of the cavity by cutting a groove in the dentine with a verysmall round bur at the cervical part, and at either end of the groovedrill small shallow pits for anchorages. The thin, sharp corner at thecutting-edge is then cut carefully away with a file or thin disk, andthe cavity edges made quite smooth so that the front of the tooth willappear as shown in
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