Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . gh-pressure syringes or obtunders, have been advocated, HI DISE iSES OF THE DBA IM. PULP based upon the principle of forcing anesthetic solutions throughsound tooth substance with intense pressure. This conception ofpressure anesthesia is erroneous. Close contact of the anestheticfluid with the dentinal fibers, plus the necessary time for conveyingthe absorbed anesthetic via the Tomes fibers to the oerve endings,explains the phenomenon very plausibly. A strong metal syringe,provided w
Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . gh-pressure syringes or obtunders, have been advocated, HI DISE iSES OF THE DBA IM. PULP based upon the principle of forcing anesthetic solutions throughsound tooth substance with intense pressure. This conception ofpressure anesthesia is erroneous. Close contact of the anestheticfluid with the dentinal fibers, plus the necessary time for conveyingthe absorbed anesthetic via the Tomes fibers to the oerve endings,explains the phenomenon very plausibly. A strong metal syringe,provided with a specially prepared needle to make as near aspossible a water-tight joint, is all that is required. Those whoprefer a special high-pressure syringe for such purposes ma) pur-chase any one of the many devices that will suit their fancy. TheWeaver obtunder or the Jewett-Willcox syringe i> much landedfor such purposes. Any one of the various method- for anesthetiz-ing a tooth as outlined under Local Anesthesia as Applied toOperative Dentistry may also he used for anesthetizing the pulp. CH53!S10nS0HE. ?Weaver high-pressure l»:iiikIiiilt syringe. In teeth not fully calcified and in so-called soft teeth, pressure anesthesia produces mosl satisfactory results, while the process is applied with difficulty in teeth of elderly persons, teeth of inveterate tobacco chewers, worn, abraded and eroded teeth with extensive ndary calcific deposits, teeth whose pulp canals are obstructed by pulp nodules, teeth With metallic oxids in their tubules, teeth with leak\ old fillings, badly calcified teeth, mainly all from one and the same cause, namely, clogged tubules. In most cases noamount of persistent pressure will prove successful. According to Hertwig the protoplasm of the eell primarily trans-fers irritation and, secondarily, transmits absorbed materials, andtherefore the anesthetic solution has to pass through the entirelength of the dentinal fibrils before the nerve endings of the
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