PubMed · 15378977
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
Julian Webber. 2004. ProTaper for hand use.. https://doi.org/10.1111/j.1747-4477.2004.tb00193.x
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
The use of nickel-titanium rotary instrument systems has gained popularity over the past 10 years. One of these instrument systems is the LightSpeed (LightSpeed Technology, Inc, San Antonio, TX). One drawback for all nickel-titanium rotary instruments is the incidence of instrument separation. The purpose of this study was to evaluate the incidence of nonretrievable instrument separation using the LightSpeed system in a clinical setting. A total of 3543 canals were treated over a 24 month period and during that time, 46 LightSpeed instruments were separated and found to be nonretrievable, resulting in a separation rate of 1.30%. This rate was lower than previous reported studies.
The purpose of this study was to compare the incidence and mode of instrument separation of the two nickel-titanium (NiTi) rotary systems that were used according to a predefined schedule of clinical use by the same group of operators. A total of 166 ProFile and 325 ProTaper instruments, discarded from this endodontic clinic over 17 months, was analyzed. The incidences of instrument separation were 7% for ProFile and 14% for ProTaper (p < 0.05). The proportion of unwinding defects was 5% in ProFile and 0.3% in ProTaper instruments (p < 0.01). Flexural fatigue was implicated in the majority of separations in both groups. The results of this study indicated that while ProTaper was more likely to separate without warning, ProFile tended to exhibit unwinding of flutes more frequently.
The warm vertical gutta-percha compaction technique requires canals to be sufficiently flared to allow the tip of the plugger to penetrate to the apical third. The aim of the present study was to determine whether apical preparation or finishing instruments could be used to improve the penetration depth of pluggers. Single-root canals (48) were prepared using different rotary Ni-Ti instruments: M File System (I), ProTaper (II), HEROShaper (III), and EndoK3 (IV). Finger and heat (Endotwinn) pluggers were introduced into the canals, one after the other, and their penetration depths were measured. The apical thirds of the canals were then flared with specific instrumentation and the penetration depths of the pluggers were once again measured. After the initial preparation, the smallest diameter pluggers (No. 1 and F) could be inserted 5 to 7 mm short of working length without difficulty. Apical flaring improved the maximum penetration depth of the finger plugger by 1.76 mm and the heat plugger by 1.52 mm The deepest penetration was obtained with the EndoK3, ProTaper, and HEROShaper instruments. By accentuating the taper, apical flaring facilitated the penetration of warm vertical gutta-percha compaction pluggers.