Principles and practice of operative dentistry . re made with a spring temper, straight and curved ; others are tempered soft, and may be given any desired curve to suit the exigencies of the case in hand. These are shown in Fig. 442 and are most useful in the anterior ^^* part of the mouth. For trimming the cervical margins of the filling,the approximal trimmer shown in Fig. 443 is one ofthe most useful instruments devised for this is file-cut upon one or both faces, and should gen-erally be used with a drawing motion, the blades ofthe file being set with that object in view. The
Principles and practice of operative dentistry . re made with a spring temper, straight and curved ; others are tempered soft, and may be given any desired curve to suit the exigencies of the case in hand. These are shown in Fig. 442 and are most useful in the anterior ^^* part of the mouth. For trimming the cervical margins of the filling,the approximal trimmer shown in Fig. 443 is one ofthe most useful instruments devised for this is file-cut upon one or both faces, and should gen-erally be used with a drawing motion, the blades ofthe file being set with that object in view. The sickle-shaped knife trimmers of Dr. GordonWhite, shown in Fig. 444 are also admirable instru-ments for trimming the cervical margins of fillings. On account of the difficulties experienced in get-ting a clear view of the field of operation, it becomesnecessary to examine the cervical margin by passinga fine probe or explorer over this portion of the filling, or, better still,floss-silk may be made to pass back and forth, from the cervix to the. Sickle-shaped trimmers. J40 OPERATIVE DENTISTRY. morsal border of the filling, and if the probe does not catch or the floss-silk becomes frayed in the process, it may be presumed that the over-lapping edges of the filling have all been removed. The final shapingof the filling may be accomplished by emery tape or sand-paper stripsdrawn back and forth over the surface of the filling. When the marginsare all well defined, the finishing may be completed with finer emery,silex, or buckhorn tape. A variety of these strips should always be onhand, comprising all the grits from the coarsest to the finest. The finalpolishing may be done with the soft rubber cups or thin soft rubber wheelscharged with fine pumice. Approximal fillings in bicuspids and molars, because of the difficulties ofaccess which are presented by their position, make them the most trouble-some of all fillings to finish. It therefore is necessary that the greatestcare be exerc
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
