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si7es e.in at ISO 334 and ran.e to si7e :4 *he heads are very short?only 234 mm for
the si7e 32 and up to %;4 mm for the si7e %22
It is recommended that the I
selected rpm remain constant As with many of the new rotary instruments,
this speed calls for a controlled, preferaly electric handpiece One of I
touted advanta.es is the aility to finish the apical-third preparation to a lar.er si7e if
dictated y the canal diameter It has een said that 6canal diameter, particularly in the
apical third, is a for.otten dimension in endodontics8 "personal communication, Dr 0arl
!awrish, %&&&(
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Figure 10-25 A, Cross-sectional view of a U File reveals six corners in cutting bladescompared with four corners in square stock and threecorners in triangular stock K les. B, Nickel-titanium -shaped les in C-shaped molar canals.Note extreme !exibilit" (arrow) without separation.#A courtes" of $erek %eath, &ualit" $ental 'roducts. B courtes" of $r. (ohn )c*padden.+
Figure 10-26he unusual LightSpeed instrument. shaped indesign with a noncutting tip, the /ight*peed utting head terminatesa 01 mm noncutting shaft.)ade onl" in nickel titanium in 2*3si4es 56 to 066 and in half si4es as well, the" are used in rotar" preparationsat 5,666 rpm. #Courtes" of /ight*peed echnolog" 2nc.+
Recommended