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6o INSTRUMENTS AND APPLIANCES
gins; made in rights and lefts, two pairs of different size for
beveling mesial cavities (cavities on the mesial surface) and
two pairs for distal cavities (Fig. 60; 1 5-95-8-1 2).
(c) Bur.—A form of drill for revolution in the handpiece of
the dental engine, intended for the rapid
cutting of tooth structure during the re-
moval of decay and preparation of cavi-
ties. Burs may be divided into two
groups, according to shape and depend-
ing on whether intended to cut round or
plane surfaces (Fig. 62).
Fig. 63.—The round
bur. Showing formation Group I for cutting concave surfaces,
of the cutting blades.
includes the round (Fig. 63), oval, pear,
bud and pointed fissure burs.
Group 2 for cutting plane surfaces and angles, includes
the cone, inverted cone, wheel and square or flat-end fissure burs.
Dentate Burs are burs with the cutting blade divided into
Fig. 64.—Enlarged dentate burs.
teeth, very rapid cutters, intended expecially for attacking
enamel (Fig. 64).
Plug-finishing Burs are burs of a finer cut of similar shape
to those mentioned in Groups i and 2, intended for finish-
ing and burnishing fillings.
gins; made in rights and lefts, two pairs of different size for
beveling mesial cavities (cavities on the mesial surface) and
two pairs for distal cavities (Fig. 60; 1 5-95-8-1 2).
(c) Bur.—A form of drill for revolution in the handpiece of
the dental engine, intended for the rapid
cutting of tooth structure during the re-
moval of decay and preparation of cavi-
ties. Burs may be divided into two
groups, according to shape and depend-
ing on whether intended to cut round or
plane surfaces (Fig. 62).
Fig. 63.—The round
bur. Showing formation Group I for cutting concave surfaces,
of the cutting blades.
includes the round (Fig. 63), oval, pear,
bud and pointed fissure burs.
Group 2 for cutting plane surfaces and angles, includes
the cone, inverted cone, wheel and square or flat-end fissure burs.
Dentate Burs are burs with the cutting blade divided into
Fig. 64.—Enlarged dentate burs.
teeth, very rapid cutters, intended expecially for attacking
enamel (Fig. 64).
Plug-finishing Burs are burs of a finer cut of similar shape
to those mentioned in Groups i and 2, intended for finish-
ing and burnishing fillings.
