Properties of endodontic hand instruments used in rotary motion. Part 3. Resistance to bending and fracture

Tepel, Joachim; Schäfer, Edgar; Hoppe, W

doi:10.1016/s0099-2399(97)80262-2

Cited by 46 publications

(35 citation statements)

References 12 publications

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“…Fakat bu aletlerin dentini kesme etkinliklerinin yeterli ölçüde olmaması nedeniyle çalışma süresinde kısalma sağlanamamıştır. 15 Bu problemin üstesinden gelebilmek için redüksiyonlu anglduruva ile sabit devirde kullanılabilen, yüksek esnekliğe sahip olan Ni-Ti (nikel titanyum) döner alet sistemleri geliştirilmiştir. 11 Buehler tarafından 1960 yılında üretilen Ni-Ti alaşımlar % 56 nikel, % 44 titanyumdan oluşmakta-dır.…”

Section: Gġrġġunclassified

Süt Di̇şleri̇nde Ni̇kel Ti̇tanyum Döner Aletleri̇ni̇n Kullaniminin Değerlendi̇ri̇lmesi̇

Garip¹,

Nur²,

Altunsoy³

et al. 2016

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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Section: Gġrġġunclassified

Süt Di̇şleri̇nde Ni̇kel Ti̇tanyum Döner Aletleri̇ni̇n Kullaniminin Değerlendi̇ri̇lmesi̇

Garip¹,

Nur²,

Altunsoy³

et al. 2016

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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“…10) (26): • In the group of con\ entional stainless steel instrtiments, the Hedstrom files on average fractured after one to two revolutions. A few Hedstrom files e\ en fractured afier about half a re\ olution.…”

Section: Torsional Propertiesmentioning

confidence: 99%

“…Milled instruments, stich as Hedstrom files, do not give tfiis warning signal since they are macfiined into a round blank. They should therefore not be used with rotary working motions (26,(32)(33)(34).…”

Section: Torsional Propertiesmentioning

confidence: 99%

Endodontic hand instruments: cutting efficiency, instrumentation of curved canals, bending and torsional properties

Tepel

Schäfer

1997

Dental Traumatology

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-In an assessment of the usefulness of diffcrcnl root canal instruments, two aspects arc of particular interest fbr the endodontist: the cutting efficiency of the instrunieiUs and their ability to enlarge cun^ed canals without undesirable changes of the canal shape such as the fbnriation of zips and elbows. This review pajUM" is based on own investigations on the cutting elliciency and iiistrumentaUon of curved canals. Addilionally, two parameters which arc described in ISO 3630-1, resistance to bending and resistance to fracture, are discussed. With regard to cutting eflicicncy in rotaiy motion, flexible stainless steel reamers and K-filcs clearly display the best results and are superior to conventional stainless steel as well as titanium-based reamers and K-files. Regarding cutting efficiency in linear motion, stainless steel Hedstrom files made by certain manufacturers are significantly superior to stainless steel and titanium-based Hedstrom files of other brands. Flexible stainless steel instruments with modified noncutting tips clearly produce the best canal shape in curved canals. With only rare exceptions, all the instruments tested fulfilled the requirements of the ISO standard concerning resistance to fracture and resistance to bending.

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“…These NiTi instruments were brought into this field considering their low modulus of elasticity as compared to that of Steel and wide "elastic" working ranges (8% elastic strain) and the huge difference between the moduli of elasticity of the austenite and the martensite in the thermoelastic ones (Walia et al, 1988). The other important property that has made NiTi alloy popular in the field of endodontic is its superior flexibility compared to that of stainless tools, which enables the root canal preparation preserving the tooth structure (Tepel et al, 1997) at minimum discomfitures to the patient. The two remarkable properties namely the shape memory effect and superelasticity of the alloy are largely governed by the chemical composition, the thermal and mechanical history of the alloy including the final cold finishing operation.…”

Section: Introductionmentioning

confidence: 99%

Effect of low temperature annealing on the wear properties of NITINOL

Mukunda

Nath.S

Herbert

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. NiTi shape memory alloy is a wonder material that is a solution looking for problems. The material finds wide biomedical applications like endodontic files for root canal treatment and cardiovascular stents. This material has rendered the surgical procedure simple compared to that with the existing Stainless Steel (SS) or titanium ones. NiTi as an endodontic file would cause less discomfort to the patients in comparison to that with far stiffer SS or titanium ones. Here nearly equi-atomic 50:50 commercial NiTi rods were subjected to low temperature aging at 300 to 450 o C. The wear resistance of the as-received and the heat-treated samples was studied using adhesive wear tests on hardened steel counter face. Abrasive wear tests were run against Alumina disc to simulate the working of endodontic drills and files against dental hard and soft tissues. The abrasive wear resistance is expected to be proportional to the Vickers Hardness of the material and is high for the 450 o C heat-treated sample. A correlation between the mechanical properties and microstructures of this material is attempted IntroductionThe Nickel-Titanium alloy also known as NITINOL was developed in the 1960s. The alloy is called NITINOL as it is an equi-atomic combination of two elements nickel and titanium and developed at the Naval Ordinance Laboratory. This Nickel-Titanium alloy can exhibit shape memory effect and superelasticity (Bradley et al., 1996). These two special properties are found in them due to the martensitic transformation in it (Brantley, 2001). The three phases are known reported in this alloy are austenite B2, martensite B'19and the R-phase B19. The austenitic phase is a high temperature phase that possesses an ordered BCC structure (like CsCl) whereas the martensitic phase is a low temperature phase with an ordered monoclinic structure. The R-phase is an intermediate phase that is seen to form either during the forward or the reverse transformation of martensite from austenite in some cases.NITINOL has proved to be the workhorse in many of the bio-medical applications such as the endodontic files used for root canal treatment, cardiovascular stents, as filters in the blood stream, as orthodontic arch wires and so on. This endodontic treatment by the dentists concerns the removal of the dead cells and tissues from the tooth cavity and filling the cavity with cementing materials (Cohen et al., 2002). The dentists need to go through a lot of challenges concerning the root canal profile. The tools used were martensitic stainless steels. These NiTi instruments were brought into this field considering their low modulus of elasticity as compared to that of Steel and wide "elastic" working ranges (8% elastic strain) and the huge difference between the moduli of elasticity of the austenite and

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Properties of endodontic hand instruments used in rotary motion. Part 3. Resistance to bending and fracture

Cited by 46 publications

References 12 publications

Süt Di̇şleri̇nde Ni̇kel Ti̇tanyum Döner Aletleri̇ni̇n Kullaniminin Değerlendi̇ri̇lmesi̇

Süt Di̇şleri̇nde Ni̇kel Ti̇tanyum Döner Aletleri̇ni̇n Kullaniminin Değerlendi̇ri̇lmesi̇

Endodontic hand instruments: cutting efficiency, instrumentation of curved canals, bending and torsional properties

Effect of low temperature annealing on the wear properties of NITINOL

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