Open AccessA scanning electron microscopic study of smear layer remaining following use of Greater Taper rotary instruments
Author(s) -
Surabhi Soumya,
Shalini Aggarwal,
Anamika Borkar,
Anita Tandale,
Shetty Ps,
Swapnil Bhosale
Publication year - 2011
Publication title -
journal of international clinical dental research organization
Language(s) - English
Resource type - Journals
eISSN - 2231-5357
pISSN - 2231-0754
DOI - 10.4103/2231-0754.115780
Subject(s) - scanning electron microscope , smear layer , layer (electronics) , materials science , orthodontics , medicine , composite material
The aim of this in vitro study was to evaluate the smear layer in the root canal following the use of Ni-Ti hand ProTaper, HERO shaper and Twisted rotary instruments. Fifteen freshly extracted single rooted human mandibular premolar teeth were selected. Crowns of all teeth were cut off at the cemento-enamel junction with a carborundum disc. The roots were then randomly divided into three groups of 5 samples each. The working length of all teeth was established by the insertion of an endodontic instrument into the canal until its tip is visible at the apical foramen and then subtracted by 0.5 mm. A sequential crown down technique was carried out in all the three groups as follows: Group-I- Specimens in this group were instrumented with ProTaper Ni-Ti hand instruments. Group-II- Specimens were instrumented with HERO shapers. Group-III - The specimens in this group were instrumented with Twisted rotary instruments. Irrigation was done with 3% NaOCl and 15% EDTA in all the three groups. Teeth were carefully split with hammer and chisel and stored in small labeled bottles containing normal saline until SEM evaluation. Results showed that when comparing ProTaper files, Twisted rotary instruments and HERO shaper instruments, HERO shaper series of rotary instruments showed maximum amount of smear layer followed by the Twisted rotary instruments. Hand instruments produced least amount of smear layer