Lectures on operative dental surgery and therapeutics . atein position, as applied to the tooth (Fig. 7.) This clamp embraces the cervical portion of the toothon the buccal and lingual sides, and affords support fora secondary spring which passes ever the posterior portion 27 of the tootli, and rests upon the slirunken gum. Theprimary spring is attached at sncli an angle to the grasp-ing plates, that it lies near the first bicuspid, and quiteout of the way; also out of the range of light. With theapplication of an ordinary clamp, at least one half of thecavity would be bridged by the rubber, l
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Lectures on operative dental surgery and therapeutics . atein position, as applied to the tooth (Fig. 7.) This clamp embraces the cervical portion of the toothon the buccal and lingual sides, and affords support fora secondary spring which passes ever the posterior portion 27 of the tootli, and rests upon the slirunken gum. Theprimary spring is attached at sncli an angle to the grasp-ing plates, that it lies near the first bicuspid, and quiteout of the way; also out of the range of light. With theapplication of an ordinary clamp, at least one half of thecavity would be bridged by the rubber, leaving an orificeunderneath for free entrance of the fluids. The clampseen in Fig. 7 now comes into action ; the primary springkeeping the plates firm on the tooth, while the secondaryspring presses on the, until now, bridging portion of thedam, and forces it below the edge of the cavity, therebyshutting off the communication which threatened to renderall efforts nugatory. This may be better understood byreferring to the explanatory notes given below.. Fig. 7. a. Primary spring, h. Clamping plates, c. Secondary spring.(I. Indicating position of rnLber on tlie posterior portion of tootli withordinary clamp, c. llubber dam. In cases where recession of the gum has taken placebetween the molars, extending in crescent shape somedistance below or above the outer and inner borders—this is occasionally seen from a too frequent or injudicioususe of the toothpic^k—groat trouble is often experienced in 28 forcing the rubber dam upon the receded portion ofgum. This class of operations bring no immediate re-compense; for the time consumed, and the ingenuity re-quired to properly fit and adjust the clamp is often verymuch greater than that of filling the tooth. Anotherdrawback to a successful issue of the operation, is thenecessary discomfort to the patient that cannot be avoided ;and here the temptation becomes very strong to use plasticmaterials. You will again be called upon to improv