Principles and practice of operative dentistry . ring engine isused than when hand instruments are employed. Swissjewellers broaches of spring temper are very valuableinstruments for enlarging the pulp-canals and cleansingthem of debris, and are much less liable to be broken andlodged in the canal than any other form of cut much slower and do not clog so readily as the Gates-Gliddendrill, and for these reasons, in small and constricted canals they are muchthe safest instruments to use. The breaking of an instrument in a pulp-canal is an exceedingly vexatious accident, as its re
Principles and practice of operative dentistry . ring engine isused than when hand instruments are employed. Swissjewellers broaches of spring temper are very valuableinstruments for enlarging the pulp-canals and cleansingthem of debris, and are much less liable to be broken andlodged in the canal than any other form of cut much slower and do not clog so readily as the Gates-Gliddendrill, and for these reasons, in small and constricted canals they are muchthe safest instruments to use. The breaking of an instrument in a pulp-canal is an exceedingly vexatious accident, as its removal often entailsno inconsiderable amount of labor and the consumption of muchvaluable time. After the orifice of the pulp-canal has been sufficiently enlarged to suitthe purpose, it should be thoroughly cleansed of all debris by the aid of the Donaldson pulp-canal cleansers. 500 OPERATIVE DENTISTRY. Donaldson pulp-canal cleansers (Fig. 560) or the nerve extractors shown inFigs. 561 and 562. Fig. 561. -Drawn FlG. 562. Spring Nerve extractors. Hydrochloric and sulphuric acids are recommended by Calla-han and others for chemically enlarging the pulp-canals. Theseagents in twenty-five to fifty per cent, solutions are conveyedto the canals upon a platinum bristle or probe and carefullyinsinuated. The affinity of these acids for the lime-stls is suchthat the walls of the canals are rapidly softened and softened material is then readily removed with the Donaldsonpulp-canal cleanser. The action of the acid may be limited bysaturating the canals with a solution of sodium bicarbonate. The third step in the operation is the local application of suchtherapeutic agents as possess germicidal, antiseptic, and disin-fectant properties. These agents all have in common the propertyof destroying pathogenic and saprophytic micro-organisms, pre-venting the development of their spores, or of rendering inertor innocuous their waste products. They differ, howeve
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