Changes in root canal morphology in simulated curved canals o ver‐instrumented with a variety of stainless steel and nickel titanium files

Lam, T. V.; Lewis, Derek J.; Atkins, Darryl R.; Macfarlane, Richard H.; Clarkson, Roger M.; Whitehead, Mark G.; Brockhurst, P. J.; Moule, Alex J.

doi:10.1111/j.1834-7819.1999.tb00530.x

Cited by 19 publications

(20 citation statements)

References 28 publications

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“…The hand preparation technique was a standardized type, without using step-back, flaring the canal circumferentially, up to a MAF #40. Compared with previous studies which have confirmed that Ni-Ti files cause significantly less transportation and remain more centered at the apical area than stainless steel hand files [7,8,10,11,15,22,24], the results of this study show that this finding cannot be generalized. Nickeltitanium hand instruments, ProFile.04 files and prototype d in fact remain more centered in the middle part of the curvature than stainless steel hand instruments.…”

Section: Canal Shape Deviationcontrasting

confidence: 55%

Preparation of severely curved simulated root canals using engine-driven rotary and conventional hand instruments

Szep¹,

Gerhardt

Leitzbach

et al. 2001

Clinical Oral Investigations

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This in vitro study evaluated the efficacy and safety of six different nickel-titanium engine-driven instruments used with a torque-controlled engine device and nickel-titanium hand and stainless steel hand instruments in preparation of curved canals. A total of 80 curved (36 degrees) simulated root canals were prepared. Images before and after were superimposed, and instrumentation areas were observed. Time of instrumentation, instrument failure, change in working length and weight loss were also recorded. Results show that stainless steel hand instruments cause significantly less transportation towards the inner wall of the canal than do nickel-titanium hand instruments. No instrument fracture occurred with hand instruments, but 30-60% breakage of instruments was recorded during instrumentation with the engine-driven devices. The working length was maintained by all types of instruments. Newly developed nickel-titanium rotary files were not able to prevent straightening of the severely curved canals when a torque-controlled engine-driven device was used.

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Section: Canal Shape Deviationcontrasting

confidence: 55%

Preparation of severely curved simulated root canals using engine-driven rotary and conventional hand instruments

Szep¹,

Gerhardt

Leitzbach

et al. 2001

Clinical Oral Investigations

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“…Stainless‐steel reamers, which should be used in a reaming working motion, cause marked transportation or straightening of the canal, especially in canals with ovoid cross‐sections (29, 53–55). Distinct transportation of curved canals was also a consistent finding for stainless‐steel K‐files with a rotational cutting action in combination with a longitudinal filing motion (20, 55–58) (Fig. 7).…”

Section: Instrument Action and Development Of Transportationsupporting

confidence: 72%

Development and sequelae of canal transportation

Schäfer¹,

Dammaschke²

2006

Endodontic Topics

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Instrumentation of curved root canals is still a challenge even for skilled and experienced operators. During shaping of these canals, canal transportation, straightening, or canal deviation may occur. This paper describes different preparation outcomes as possible results of canal transportation, and the action of different root canal instruments when used in curved canals, and provides an overview of current in vitro and in vivo studies assessing canal transportation. In the second part of this paper, the clinical consequences of canal transportation such as insufficient cleaning and over‐reduction of radicular dentin are addressed. Finally, based on currently available evidence, the impact of canal transportation on the clinical outcome of root canal treatment is discussed.

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“…54,55 However, instruments with active cutting blades must be used with caution in the apical region as overinstrumentation with these instruments is likely to create an apical zip. 56 Some studies have reported that instrument shaft design does not significantly modify canal shapes of similar apical sizes, 57 while others have shown that a thin and flexible shaft will permit larger apical sizes with less aberrations.…”

Section: Impact Of Instrument Design Featuresmentioning

confidence: 99%

The principles of techniques for cleaning root canals

Parashos

Messer

2007

Australian Dental Journal

129

120

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Chemomechanical preparation of the root canal includes both mechanical instrumentation and antibacterial irrigation, and is principally directed toward the elimination of micro-organisms from the root canal system. A variety of instruments and techniques have been developed and described for this critical stage of root canal treatment. Since their introduction in 1988, nickel-titanium (NiTi) rotary instruments have become a mainstay in clinical endodontics because of their exceptional ability to shape root canals with potentially fewer procedural complications. Safe clinical usage of NiTi instruments requires an understanding of basic metallurgy of the alloy including fracture mechanisms and their correlation to canal anatomy. This paper reviews the biologic principles of preparing root canals with an emphasis on correct use of current rotary NiTi instrumentation techniques and systems. The role and properties of contemporary root canal irrigants is also discussed.Key words: Nickel-titanium alloy, root canal instrumentation, rotary preparation, irrigation, endodontics.Abbreviations and acronyms: EDTA = ethylenediamene tetraacetic acid; NaOC1 = sodium hypochlorite; NIET = non-instrumentation endodontic treatment; NiTi = nickel titanium; PAD = photo activated disinfection.

show abstract

Changes in root canal morphology in simulated curved canals o ver‐instrumented with a variety of stainless steel and nickel titanium files

Cited by 19 publications

References 28 publications

Preparation of severely curved simulated root canals using engine-driven rotary and conventional hand instruments

Preparation of severely curved simulated root canals using engine-driven rotary and conventional hand instruments

Development and sequelae of canal transportation

The principles of techniques for cleaning root canals

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