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Effect of nickel titanium file design on the root surface strain and apical microcracks
Author(s) -
Jamleh Ahmed,
Adorno Carlos G.,
Ebihara Arata,
Suda Hideaki
Publication year - 2016
Publication title -
australian endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.703
H-Index - 34
eISSN - 1747-4477
pISSN - 1329-1947
DOI - 10.1111/aej.12116
Subject(s) - nickel titanium , root canal , strain (injury) , strain gauge , materials science , significant difference , dentistry , mathematics , metallurgy , composite material , anatomy , medicine , statistics , shape memory alloy
The aim of this study was to determine the effect of nickel titanium file design on the root surface strain generated and apical microcracks caused during canal shaping. Thirty‐three mandibular incisors were distributed into L ight S peed X , F lex M aster and a control group. A strain gauge was fixed apically on the proximal root surface to determine the maximum strain during canal shaping. Except for the control group, all root canals were enlarged to size 50. Images were taken after removing the apical 1 and 2 mm of the root end. Mean maximum strain values and presence of microcracks were statistically compared using the t ‐test and chi‐square test, respectively. During canal shaping, the strain increased cumulatively with mean maximum strains of 808.2 ± 228.8 and 525.1 ± 168.9 microstrain in L ight S peed X and F lex M aster, respectively ( P = 0.004). Both systems caused comparable microcracks. Although L ight S peed X produced higher maximum strain, no difference in microcrack development was found between both systems.