Effectiveness and safety of a sonic vibratory endodontic instrument

Abstract

Frasca P. Effectiveness and safety of a sonic vibratory endodontic instrument. Endod Dent Traumatol 1985; 1: 69-76.Abstract -An air-driven sonic vibratory handpiece to which specially designed K-type fifes are attached has been developed. When activated, the root canal instruments will vibrate in a whirling motion, and when moved up and down, will abrade the root canal wall. The sonic system was tested in simulated root canals in plastic blocks and in usage tests iu dogs' teeth. Fortynine roots in 3 dogs were divided into 3 groups. Two of the groups were instrumented with the sonic device under continuous irrigation with 2.5% NaOCl or 15% EDTA. The 3rd group was treated with conventional chemomechanical instrumentation and 2.5% NaOCl. The teeth were then extracted, fi.xed and split in a longitudinal direction and the root canals examined in the scanning electron microscope. After hand instrumentation and sonic instrumentation using NaOCl for irrigation, the canal wall was covered by a smear layer and dentin chips and occasional tissue remnants were seen. An extraoral fine mist of NaOCl was seen during continuous irrigation with this medicament, causing eye soreness in the operator. Continuous irrigation with EDTA during sonic instrumentation removed the smear layer and gave clean canal walls. The vibratory files appeared safe and size 20 followed curved canals well. The effectiveness of the sonic device was similar to hand instrumentation. It considerably improved tbe ease and, to some extent, the speed of root canal instrumentation.

Pressure Alteration Techniques in Endodontics- A Review of Literature

“…Sonic instruments for endodontics were first reported by Tronstad et al, [19]. Sonic irrigation operates at a lower frequency (1-6 kHz) and produces smaller shear stresses than ultrasonic irrigation Ahmed of air entrapment, when the needle tips are placed too far away from the apical end of the canals.…”

“…This highly flexible microbrush is molded entirely from polypropylene and might be used manually with a rotary action. Weise et al, showed that debris was effectively removed from simulated canal extensions and irregularities with the use of the small and flexible CanalBrush with an irrigant [19].…”

Comparison of Passive Ultrasonic Debridement Between Fluted and Nonfluted Instruments in Root Canals

“…Tronstad et al (11) found longitudinal parallel grooves on the canal walls that had been apparently caused by the tips of the files. Walmsley et al (12) found that during the process of ultrasonic instrumentation, a distinct pattern or marking was left in the dentin of the canal walls and that the longitudinal marks suggested the file tip may have been working as a hand file and not oscillating properly.…”

Endodonti̇de İrri̇gasyon Akti̇vasyon Yöntemleri̇

“…Tronstad ve ark. 35 sonik aletlerle birlikte EDTA ve NaOCl solüsyonunun kullanılmasının etkinliklerini değerlendirmişler ve sonik aletlerle EDTA solüs-yonu kullanımının, daha etkili olduğunu belirtmişlerdir.…”