. Dental e heardobjections made to this form of preparation on the ground thatwe are not justified in cutting away so much sound tooth struc- THE DENTAL SUMMARY 15 ture. But if you will remember that the strength of the tooth itiin the dentin and not in the enamel, and that it is seldom neces-sary in extension either on the occlusal or proximal surfaces ofa tooth to go very deep into the dentin and that we do littlemore than replace the enamel of that tooth with a gold enamel;and when you remember that it requires only half as much re-tentive form to retain a filling when the retenti
. Dental e heardobjections made to this form of preparation on the ground thatwe are not justified in cutting away so much sound tooth struc- THE DENTAL SUMMARY 15 ture. But if you will remember that the strength of the tooth itiin the dentin and not in the enamel, and that it is seldom neces-sary in extension either on the occlusal or proximal surfaces ofa tooth to go very deep into the dentin and that we do littlemore than replace the enamel of that tooth with a gold enamel;and when you remember that it requires only half as much re-tentive form to retain a filling when the retention is made inthe occlusal as it does when made in the buccal and lingua!walls, the fallacy of this argument will be plainly seen. It has been impossible in even this lengthy paper to giveyou every cavity preparation that can be made. But I havetried to give you the fundamentals and some typical formswhich you can apply and modify as your cases present them-selves. Good judgment must be used in their application. It. Fie. 35 Fig, 36 Fig. 37 would be the height of folly to make large extensions in themouth of a person more than 50 or 60 years old in which a con-dition of permanent immunity seemed to exist. It would bebarbarous to make large extensions for one of those extremelynervous patients to whom the least touch of the instrument isthe keenest torture. These fundamentals apply to the ordinarycase in which there is an intermittent condition of susceptibil-ity and immunity, and for whom you desire to make operationsthat are permanent in their character. ESSENTIAL THINGS CONCERNING THE PROPER MANIPULA-TION OF GOLD FOIL. I wish also to call your attention to some of the essentialthings concerning the proper manipulation of gold foil. Never fill the gingival third of cavities in the bicuspids andmolars with cohesive foil. Dr. Black tells us that in the handsof our best operators 10 per cent, of such operations are fail- I 6 THE DENTAL SUMMARY urcs. Always fill the gingival third
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