Author/Editor		Fidler, A
Title		Preprečevanje zloma NiTi-instrumentov za strojno širjenje koreninskih kanalov
Translated title		Prevention of NiTi rotary instrument fractures
Type		članek
Source		Zobozdrav Vestn
Vol. and No.		Letnik 62, št. 2-3
Publication year		2007
Volume		str. 77-84
Language		slo
Abstract		Major advantages of NiTi rotary over hand root canal instrumentation are better root canal shape and faster and less tiring work. Recent studies have shown that the fracture rate of NiTi rotary instruments is comparable to that of hand instruments. Fracture of rotary NiTi instruments is a consequence of torsional overload, cyclic fatigue of the material or a combination of these two factors. Fracture due to torsional overload usually occurs when instruments with a small cross-sectional diameter are used in root canals without prior manual preparation. Fractures due to cyclic fatigue usually occur when instruments with a big cross-sectional diameter are used in curved root canals. The incidence of fractures in clinical work depends on operator competence, shape and curvature of the root canal, and shape, size and prior use of the instrument.
Descriptors		ROOT CANAL PREPARATION DENTAL INSTRUMENTS EQUIPMENT FAILURE TITANIUM NICKEL