Endodontic test file

Details Endodontic test file Endodontic test file

1980-08-18

1982-07-20

Mancene, Gene

Dentistry

Apparatus

Having gauge or guide

433 72, 433102, A61C 300, A61C 502

Patent

active

043403646

ABSTRACT:
An endodontic test file for use in root canal therapy for quickly and accurately measuring the length between the crown occlusal surface and the apex of the root canal without the necessity of x-rays. The test file has a smooth tapered shank with calibrations etched along the shank, a convenient handle on the larger end of the shank and at the narrow end, a sharp screw tip having a total screw length of only approximately 0.5 mm. In operation the test file is inserted into the previously prepared coronal cavity and is screwed through the root canal until rotation of the screw tip no longer advances the test file through the canal. At this point, the tip has passed through the apex and into the infected soft periodontal ligament. The etched shaft calibrations then indicate the precise tooth length.

REFERENCES:
patent: 639359 (1899-11-01), Schultz
patent: 1067015 (1913-07-01), Fowler
patent: 1366877 (1921-01-01), Craig
patent: 3772791 (1973-11-01), Malmin
patent: 3935640 (1976-02-01), Cohen
patent: 4190958 (1980-03-01), Martin et al.
patent: 4231738 (1980-11-01), Riitano et al.

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