[Experimental study of accuracy of electro-odontometric device in establishment of apical constriction of a root canal].
The aim of the present study was to investigate the accuracy of an electro-odontometric device "Odontometer" (Goof, Denmark) in the determination of the exact location of the apical constriction in root canals of extracted teeth in experimental conditions. Ninetynine root canals of 91 teeth were used. Following the access to the root canal the teeth were sealed at the level of the cemento-enamel junction in the apertures of a plastic plate. Each plate contained ten tooth samples. The plate was immersed into a gelatine medium. The roots were completely immersed but the crowns were isolated from the medium by the plastic plate and sticky wax seal, remaining at the top surface of the plate. The platinum plate was immersed in the gelatine medium and connected to the passive electrode of the device. The active electrode was a K-reamer n. 15 which was advanced along the canal until "Odontometer" indicated "apical constriction". At this point the reamer was sealed in the canal, and the toot was released from the apparatus. The apical third of the root was then ground parallel to the long axis until the distal segment of the K-reamer and the root canal appeared. The distance between the tip of the reamer and the apical constriction was measured with a microscope precision of 0.125 mm. The absolutely exact location of the apical constriction was determined in 22% of cases. In no case the endocanal electrode passed over the anatomic foramen. With the tolerance of the clinically acceptable odontometric error of 0.5 mm, "Odontometer" was accurate in 83% of cases thus its use in current dental practice is justified.
Pajić
M
M
University School of Dental Medicine, Belgrade.
Vujasković
M
M
Ivanović
V
V
D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D006801:Humans; D009811:Odontometry / Q000295:instrumentation*; D012390:Root Canal Therapy / Q000295:instrumentation; D014092:Tooth Root / Q000033:anatomy & histology
Laboratorijsko ispitivanje tacnosti elektroodontometrijskog odredivanja likocije apeksnog suzenja Korenskog kanala.