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Comparison of the force required to fracture roots vertically after ultrasonic and Masserann removal of broken instruments
Author(s) -
Gerek M.,
Başer E. D.,
Kayahan M. B.,
Sunay H.,
Kaptan R. F.,
Bayırlı G.
Publication year - 2012
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.2011.01993.x
Subject(s) - breakage , fracture (geology) , universal testing machine , significant difference , dentistry , ultrasonic sensor , crown (dentistry) , materials science , dental instruments , orthodontics , mathematics , biomedical engineering , composite material , medicine , radiology , ultimate tensile strength , statistics
Gerek M, Başer ED, Kayahan MB, Sunay H, Kaptan RF, Bayırlı G. Comparison of the force required to fracture roots vertically after ultrasonic and Masserann removal of broken instruments. International Endodontic Journal , 45 , 429–434, 2012. Abstract Aim To evaluate the force required to fracture roots vertically after the removal of broken instruments using ultrasonic tips and a Masserann kit. Methodology Thirty‐nine extracted human anterior teeth with single and straight roots were used. The crown of each tooth was removed until the full length of the tooth was 13 mm. All canals were instrumented with the step‐back technique to a size 25 K‐file. The teeth were randomly divided into three groups: two experimental groups and a control group. The size 30 K‐files used for the test were notched to a depth of half of the instrument with a No. 2 round bur at a point 3 mm from the tip to facilitate breakage of the file at this point. The fractured instruments were removed from the canals using ultrasonic tips or a Masserann kit. The samples were subjected to a continual vertical loading, using a universal testing machine. For each root, the force at the time of fracture was recorded in Newtons. The results were analysed statistically using one‐way anova and Tukey HSD test. Results The force required to fracture the roots vertically was significantly higher in the control group than the experimental groups ( P < 0.01). The roots from which the broken instruments had been removed using ultrasonic tips required more force to fracture than roots in the Masserann group; however, the difference was not statistically significant. Conclusion Removal of a fractured instrument from the middle third of the root decreased the force required to fracture the root vertically, regardless of the technique used for instrument removal. There was not difference between the ultrasonic technique and the Masserann technique.