(2) Availability. Available stainless steel burs include the following for both
AHP and SHP except as noted: round burs numbers 1/2, 2, 4, 6, and 8; inverted cone
burs numbers 33 1/2, 35, 37, and 39 (39 is available for AHP only); straight crosscut
fissure burs numbers 557, 558, 559, and 560 (560 is available for AHP only); and tapered
crosscut fissure burs numbers 700, 701, 702. Angle hand piece steel burs numbers 4,
35, and 558 are available in either the standard or short-neck lengths. Tungsten carbide
burs are available for the AHP in the same sizes except for numbers 1/2 and 560. An
end-cutting tungsten carbide bur is available as number 901. The tungsten carbide burs
function best at high-speed operations; they are harder than stainless steel burs.
Available friction grip tungsten carbide burs (see figure 2-4) include the following for high-
speed angle hand pieces: round burs. Numbers 1/2, 2, 4, and 6; inverted cone burs
numbers 33 1/2, 34, and 35; straight, crosscut fissure burs number 557 and 558; straight,
plain fissure bur number 57; tapered, crosscut fissure burs number 699, 700, and 701;
and tapered, plain fissure bur number 170L.
Figure 2-4. Friction-grip tungsten carbide bur.
b. Diamond Stones and Wheels (WHEEL, ABRASIVE, MANDREL,
MOUNTED, DIAMOND, ANGLE HAND PIECE or SLOW-SPEED STRAIGHT HAND
PIECE). Diamond stones and wheels (figure 2-5) are used to cut enamel and are
manufactured in various sizes and shapes. These instruments create heat during use
and require water or air-cooling if used for any length of time.
Figure 2-5. Diamond points.