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2 20 THE TREATMENT OF PULPS

Rule 2.—^In sound teeth, or teeth with perfect fillings,
enter through the center of the lingual surface of incisors and

cuspids, the mesial pit of bicuspids and the central fossa of
molars.
Rule 3.—^Enlarge the opening, whether through an already
existing cavity or one artificially made, until convenient
access to the pulp chamber and canals is obtained; at the

same time, avoid weakening the tooth by too much cutting.
Rule 4.—Make the walls of the cavity and pulp chamber
continuous and smooth, though not necessarily parallel or on
the same plane.
Rule 5.—Make the walls of the pulp chamber and canals

continuous and smooth.

Technic for Opening into Pulp Chambers

I. In Soimd Teeth.

(a) Perforate the enamel with a i -millimeter bi-bevelled
dentate fissure bur (made by bevelling a dentate fissure bur
on two sides), or a small spear-point drill, in the handpiece of
the engine.

(b) Enlarge the opening with a larger sized bur or drill.
(c) Perforate the dentin gradually to the pulp chamber,
alternating first with the smaller and then the larger sized
burs or drills, avoiding the danger of breakage by frequently
withdrawing, and continuing in this manner until the pulp
chamber is reached.
(d) Enlarge the opening with the same instruments until

convenient access is obtained, and then remove the entire
wall of the pulp chamber, extending the cuttings out until
the horns of the pulp chamber are included.
(e) Make the walls of the cavity and pulp chamber
continuous and smooth.