A simple device for length adjustment of reamers and files
Fig. 1. A new \implr
anti handy endodontic meter for rranlci
or file.
V
arious devices and methods for length adjustment ot’ endodontic hand instruments are described in the endodontic textbooks. ’ ” Some requirements for adjustment of the lengths CJI reamers and tiles arc that the!, should be easily and readily performed. accurate, and easily contirmed. The device to be used should be small in weight and sire. easy to handle. and useful. According to Ingle and Beberidge.” several methods developed so far “involves complex devices that are clumsy, bulky. time consuning, inaccurate. and frustrating.” A simplified method can be used on basis ot‘ the following assumptions: ( 1) The average length of teeth varies for all types of teeth. except cuspids, from 19 to 23 mm. (2) The accuracy of’ length ad.justment should not necessarily be less than 1 mm. (3) Reamers of tiles. according to the international standards of the Fddkration Dentaire Internationale, the World Health Organization. and the American Dental Association. have LI total length from top to hub of 25 mm. and a \vorkins section of 16 mm.
562
On the basi\ ot these assumptions. the length of hand Instruments is adjusted to 18. 19. 20, 31. 72, or 23 mm. bq means ot‘ a rubber stop and use of’the device as shown in Fig. I. A package box for six handpiece burs is moditied with small rubber blocs to permit 4x diffcrent length ad.justments in a handy and simple way. In Table I ;I comparison is given for some devices on criteria of ~cight. sire. manageability, and usefulness. REFERENCES
Fig. 1. A new \implr
anti handy endodontic meter for rranlci
or file.
V
arious devices and methods for length adjustment ot’ endodontic hand instruments are described in the endodontic textbooks. ’ ” Some requirements for adjustment of the lengths CJI reamers and tiles arc that the!, should be easily and readily performed. accurate, and easily contirmed. The device to be used should be small in weight and sire. easy to handle. and useful. According to Ingle and Beberidge.” several methods developed so far “involves complex devices that are clumsy, bulky. time consuning, inaccurate. and frustrating.” A simplified method can be used on basis ot‘ the following assumptions: ( 1) The average length of teeth varies for all types of teeth. except cuspids, from 19 to 23 mm. (2) The accuracy of’ length ad.justment should not necessarily be less than 1 mm. (3) Reamers of tiles. according to the international standards of the Fddkration Dentaire Internationale, the World Health Organization. and the American Dental Association. have LI total length from top to hub of 25 mm. and a \vorkins section of 16 mm.
562
On the basi\ ot these assumptions. the length of hand Instruments is adjusted to 18. 19. 20, 31. 72, or 23 mm. bq means ot‘ a rubber stop and use of’the device as shown in Fig. I. A package box for six handpiece burs is moditied with small rubber blocs to permit 4x diffcrent length ad.justments in a handy and simple way. In Table I ;I comparison is given for some devices on criteria of ~cight. sire. manageability, and usefulness. REFERENCES
