f. Instrument and Material Numbering System. Files and reamers are
numbered progressively with increases in size. Gutta-percha points and silver points are
sized to correspond with the instrument numbering system. For example, number 50
silver point correspons to number 50 file or reamer. Paper points are available in sizes of
fine, extra fine, medium, and extra coarse. See figure 4-20.
Figure 4-20. Gutta-percha points, silver points, and paper points.
See appendix A for items listed in typical endodontic instrument setups.
INSTRUMENT SETUPS AND PROCEDURES
a. Preparing for the Patient. Preparation for the patient includes cleaning and
sterilizing of instruments and equipment used for the previous patient, and the placement
of linens, headrest covers, and bracket table covers for the new patient. It also includes
setting out the patient's records and radiographs for reference by the dental officer and
preparing appropriate instruments and equipment setups. All unit instruments such as
handpieces and air and water syringes should be wiped vigorously with an alcohol-
saturated sponge. If the unit is not to be used immediately, alcohol-saturated sponges
should be draped or wrapped around the unit instruments to keep the unit clean.
b. Use of Auxiliary Aids for Diagnosis.
The pulp tester is frequently used in the endodontic service as an aid to