The Dental cosmos . c point of view, but would be at adisadvantage as to strength of retention. In Items of Interest, vol. xxvi, page130, appears an article by Dr. Hanning,read before the Second District DentalSociety of the State of New York, inwhich he advocates a kind of post reten-tion for these display fillings. This idea,however, seems to be limited to those de-vitalized teeth where use can be made of the pulp-chamber and pulp-canals. (Seeright side of Fig. 8.) I feel that it is hardly necessary to gofarther into a review of such methods,as I believe these few will suffice to es-tablish
The Dental cosmos . c point of view, but would be at adisadvantage as to strength of retention. In Items of Interest, vol. xxvi, page130, appears an article by Dr. Hanning,read before the Second District DentalSociety of the State of New York, inwhich he advocates a kind of post reten-tion for these display fillings. This idea,however, seems to be limited to those de-vitalized teeth where use can be made of the pulp-chamber and pulp-canals. (Seeright side of Fig. 8.) I feel that it is hardly necessary to gofarther into a review of such methods,as I believe these few will suffice to es-tablish the fact that they constitute theprevailing methods of retention of thisclass of fillings, if indeed, there be any-one who would be prepared to deny it atall. I also believe that all will admit thatin these methods there is necessarily agreat sacrifice of sound tooth tissue, andin some instances a great display of fill-ing from excessive cutting. The only other means heretoforebrought forward to improve these de- structive methods—at least the only onewhich has come to my knowledge—is thelittle anchor screws sold by The S. Dental Mfg. Co. and illustrated inFig. 9. These screws have been used to alimited extent in very favorable cases, butthey have never been popular on accountof the clumsy size, and the difficulty insecuring the accuracy necessary for theiradjustment, as they depend on the hold-ing power of the threads in the dentinfor support. They also require a holeto be drilled, the size of which weakensthe body of the tooth very materially. As a general substitute for all thesemethods of preparation of cavities and re-tention of filling, and especially thosecontour fillings involving the restorationof the corners of incisors, I wish to offerthe following idea, which if not new, atleast possesses some novelty, and which JOHNSON.—METHODS FOR THE RETENTION OF FILLINGS. 365 has not thus far, to my knowledge, beenillustrated or published; it has in itsfavor th
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