Evaluating the sizes of Lightspeed instruments.

Abstract:

:The diameters of six different sized Lightspeed cutting heads were measured using a modified optical micrometer. Six specimens of instrument sizes 20, 22.5, 27.7, 30, 32.5 and 45 were examined. Except for one cutting head of size 30, all the recorded diameters were oversized compared to the expected diameter and the permitted tolerance (+/- 0.005 mm). Perfectly machined instruments would increase by 12.5%, 9.09% and 8.3% from instrument sizes 20-22.5, 27.5-30 and 30-32.5, respectively. Under the conditions of this study, the corresponding increases were 7.1%, 6.75% and 8.54%. Instrument size 20 had the widest range and is the smallest instrument in the Lightspeed set. The largest differences between the recorded and expected means were registered for the size 45 group. An earlier study using a different measuring method reported that Lightspeed instruments were mostly undersized.

journal_name

Int Endod J

authors

Schrader C,Sener B,Barbakow F

doi

10.1046/j.1365-2591.1998.00163.x

subject

Has Abstract

pub_date

1998-07-01 00:00:00

pages

295-300

issue

4

eissn

0143-2885

issn

1365-2591

journal_volume

31

pub_type

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