Es. Marsicovetere et al., MORPHOMETRIC VIDEO ANALYSIS OF THE ENGINE-DRIVEN NICKEL-TITANIUM LIGHTSPEED INSTRUMENT SYSTEM, Journal of endodontics, 22(5), 1996, pp. 231-235
Two hundred and sixteen Lightspeed instruments were evaluated microsco
pically for the presence of corrosion, surface debris, and alloy defec
ts, The instruments were assessed morphometrically for consistency of
physical design and dimensions by measuring and analyzing eight parame
ters of the instrument pilot tips, heads, and shafts, Results from vis
ual inspection showed that none of the instruments were corroded; 23 p
resented surface porosities, and 17 had sharp strips of alloy, Data ob
tained by morphometric analysis indicated the mean diameter of the hea
d of only 7 of 18 sizes met the +/-0.02 mm allowable tolerance set for
th by the American Dental Association (ADA) Specification No. 28. Obse
rvation and video analysis indicated that instruments of the same size
adhere to the same basic design, but that morphometric variations do
exist, The visual and intersize analysis indicated that the Lightspeed
is not an instrument of any one determined shape that changes only in
diameter, Rather, it is a series of instruments that show gradual shi
fts in both size and shape as the instrument size increases, Lightspee
d instruments are a new type of nickel-titanium endodontic instrument
that cannot be evaluated using the standards proposed by the American
National Standards Institute/ADA Specification No, 28 for files and re
amers.