Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . teethand the adjacent dam is washed with alcohol and dried with bibu-lous paper. A root canal should only be entered into with abso-lutely sterile broaches, absorbent paper or cotton points, gutta-percha cones, root canal pluggers, etc. All long-handled instru-ments should be sterilized by boiling in the usual way in any one 170 \SES OF THE DENTAL PULP of the ordinary sterilizers, while the delicate root-canal instru-ments, such as broaches, files, reamers, etc., may be sterilized byd
Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . teethand the adjacent dam is washed with alcohol and dried with bibu-lous paper. A root canal should only be entered into with abso-lutely sterile broaches, absorbent paper or cotton points, gutta-percha cones, root canal pluggers, etc. All long-handled instru-ments should be sterilized by boiling in the usual way in any one 170 \SES OF THE DENTAL PULP of the ordinary sterilizers, while the delicate root-canal instru-ments, such as broaches, files, reamers, etc., may be sterilized bydr\ heat, by using the Flaherty Molten Metal sterilizer or bychemical mean- as they lose much of their rigidity by boiling inwater and, consequently, they readily break. The Flaherty Mol-ten Metal sterilizer is a useful apparatus for sterilizing root-canalinstruments, absorbent point-, etc. According to laboratory t<as carried out in various institutions, metal broaches, etc., arerendered sterile in five seconds, while paper point- and otherporous objects require ten seconds when dipped into the molten. Fig. 84. Dry heat steriliser. Automatic control makes it possible to maintainany degree of temperature from 200e F. to 350 F. for an indefinite period. Atemperature of 230 F. \\ ill sterilize in ten minutes, with >i higher degree «>f tempera-ture less time is required, and with a lower temperature the time must be lengthenedproportionately. Especially useful for cotton, absorbenl points, gutta-percha anapkins, dressings, etc. ( k>olid| metal. The temper of the broaches, etc., is not altered by theshort exposure to the metal hath. A simple and satisfactorychemical method of sterilization consists iii immersing the broaches,files, , etc., in a concentrated (10 per cent) solution of-odium hydroxid for fifteen minutes. This alkaline solutionpossesses the additional advantage of dissolving organic d€brisentangled in the barbes of the broaches. A suitable solutio
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