. The principles and practice of dental surgery. y, thesurface should be made as smooth as possible with a very fine orhalf worn file, or with Arkansas stone, finishing with pumice-stone or powdered silex, applied upon a piece of cord, tape, orsuitably shaped piece of hard, tough wood. All edges and sharpcorners should be rounded and made smooth, and when theoperation is completed, the patient should be directed to keepthe filed surfaces perfectly clean ; for if the mucous secretionsof the mouth, or extraneous matter is permitted to adhere tothem, a recurrence of the disease will take place. I
. The principles and practice of dental surgery. y, thesurface should be made as smooth as possible with a very fine orhalf worn file, or with Arkansas stone, finishing with pumice-stone or powdered silex, applied upon a piece of cord, tape, orsuitably shaped piece of hard, tough wood. All edges and sharpcorners should be rounded and made smooth, and when theoperation is completed, the patient should be directed to keepthe filed surfaces perfectly clean ; for if the mucous secretionsof the mouth, or extraneous matter is permitted to adhere tothem, a recurrence of the disease will take place. In Fig. 77 is represented a posterior view of the superior in*cisors and cuspids after havingbeen filed; also, of the bicuspidsand molars after having been sub-jected to the same operation. In separating the bicuspids, aspace should be made somewhatin the form of the letter V; itshould not, however, form anacute angle at the gum ; for itsformation a file, shaped like aclockmakers pinion-file, or onethat is oval on one side and flat Fig. 77. vX^X. 262 FILING TEETH. on the other, will be found most suitable. A space shaped inthis manner will prevent the approximation of the sides of theteeth, and if filling be necessary, it will enable the operator todo it in the most perfect manner. When the separation of the molar teeth becomes necessary,the same shaped space should be formed. But as these teethare situated far back in the mouth, it cannot often be done with astraight file; to obviate this difficulty, an instrument, with whichevery dentist is acquainted, denominated a file-carrier, is usuallyemployed. But in consequence of the difficulty of procuring in-struments of this kind, exactly suited to holding files of theright shape, the author, a few years ago, sent some file patternsto Stubs manufactory, in England, and had files made, whichhe found to answer his fullest expectations. These files (), are shaped something like a pinion file : they are an inch Fig. 78.
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