Comparative Analysis of Torsional and Bending Stresses in Two Mathematical Models of Nickel-Titanium Rotary Instruments: ProTaper versus ProFile

Berutti, Elio; Chiandussi, Giorgio; Gaviglio, Ivan Piergiorgio; Ibba, A.

doi:10.1097/00004770-200301000-00005

Cited by 191 publications

(208 citation statements)

References 15 publications

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“…Eğelerin kesit şeklinin stres dağılımını ve dolayısıyla torsiyonel ve eğilme davranışlarını etkilediği bildirilmiştir (14)(15)(16). Çalışmamızda eğri kök kanallarında şekillendirme esnasında oluşan streslerin belirlenmesi esas alındığı için farklı kesit, çap ve kesme açısına sahip bu iki sistem tercih edilmiştir.…”

Section: Discussionunclassified

“…This shows us that these files are more feasible for apical transportation. Key words: Curved canals, HeroShaper, ProTaper, finite element analysis, stress MÜSBED 2013;3(1): [14][15][16][17][18] Araştırma / Original Paper GİRİŞ Kanal preparasyonunun temel amacı, kök kanal sistemini, organik artıklardan temizlemek ve tüm kök kanal boşlu-ğunu üç boyutlu ve hermetik bir şekilde doldurabilmek için şekillendirmektir (1). Eğri kök kanallarında şekillendirme işlemi sırasında, orijinal kanal seyrinin eğimin dış tarafına kayması sonucu kök kanal duvarının konkav kısmından kal-DOI: 10.5455/musbed.20130124112218 dırılamayan enfekte doku artıkları (2) ve bakteriler tedavinin başarısızlığına neden olabilmektedir.…”

Section: Introductionunclassified

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Finite Element Analysis of Stress Distribution on Canal Walls While Preparation of Curved Canals

Türkaydın

Günday

Eki̇ci̇

2013

MUSBED

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Eğri kök kanallarında şekillendirme sırasında oluşan streslerin sonlu elemanlar yöntemi ile değerlendirilmesi Amaç: Bu çalışmanın amacı eğri kök kanallarında ProTaper Universal ve HeroShaper sistemleri ile şekillendirme yapılırken kanal duvarlarında oluşan streslerin üç boyutlu sonlu elemanlar analizi ile belirlenmesidir. Yöntem: ProTaper Universal ve HeroShaper Ni-Ti döner alet sistemlerine ait eğelerin geometrileri üç boyutlu sonlu elemanlar yöntemi ile oluşturulmuştur. Eğri kök kanalına sahip dişin üç boyutlu sonlu elemanlar modeli, doğal diş ve yapay kanalın birleştirilmesi ile oluşturulmuştur. Modellerin taranması için mikro-fokus CT kullanılmıştır. Birleştirme ve modifikasyondan sonra düzgün yüzeyli ve kanalı merkezde seyreden üç boyutlu model elde edilmiştir. Şekillendirme benzetimi sırasında kanal duvarlarında oluşan stresler LS-DYNA sonlu elemanlar programı ile ve nikel titanyum materyalinin non-lineer mekanik özellikleri dikkate alınarak kayıt edilmiştir. Bulgular: ProTaper eğe sistemi ile şekillendirmede kanalın apikal kısmında eğimin dışına doğru stres yoğunluğu oluştuğu ancak HeroShaper ile yapılan şekillendirme benzetiminde orta kısımda ve ProTaper modelinden daha az stres oluştuğu belirlenmiştir. Sonuçlar: HeroShaper eğe modelleri kanal duvarlarında ProTaper eğe modellerine göre daha az stres oluşturmuştur. HeroShaper eğe modellerinin kesme etkinliğinin yüksek olması sebebiyle dentin direnci azalmaktadır. ProTaper eğe modelleri ile şekillendirme benzetimi yapılan kanalarda stres oluşumunun, özellikle apikal alanda eğriliğin dışına doğru artmış olduğu görülmüştür. Bu da ProTaper eğelerinin apikal transportasyona daha yatkın olduğunu göstermektedir. Anahtar sözcükler: Eğri kök kanalları, HeroShaper, ProTaper, sonlu elemanlar analizi, stres ABS TRACT Finite element analysis of stress distribution on canal walls while preparation of curved canalsObjective: The aim of this study is to determine stress evaluation of root canal wall during shaping curved canals with ProTaper and HeroShaper systems by using three-dimensional finite element analysis. Methods: The geometries of the ProTaper Universal and HeroShaper Ni-Ti rotary systems' selected files were created using threedimensional finite element models. The three-dimensional FEA model within a curved canal was established by integrating a simulated canal and natural tooth. A micro-focus CT scanner was used to scan the models. After integration and modification a final three-dimensional model with a smooth surface and mostly centered canal was established. The stresses on the instrument during simulated shaping of a root canal were analyzed numerically by using a three-dimensional finite element package, LS-DYNA, taking into account the nonlinear mechanical behavior of the nickeltitanium material. Stress distribution in the instruments and the canal walls was recorded during simulated shaping. Results: With ProTaper file system, stress concentrations were determined towards the outer aspect of the curvature in the apical portion of the canal but in Hero...

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Section: Discussionunclassified

Section: Introductionunclassified

Finite Element Analysis of Stress Distribution on Canal Walls While Preparation of Curved Canals

Türkaydın

Günday

Eki̇ci̇

2013

MUSBED

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“…There were a few reports about Mtwo rotary 11,18,19) , however, several researches have been studied for the safety and the efficiency of crown-down technique using ProTaper system [20][21][22] . The study using mathematic models have demonstrated that ProTaper instruments work longer in a super elastic phase than instruments with a Ufile design, allowing for high performance and less risk 20) . According to Calberson et al 21) , ProTaper instruments performed acceptable tapered preparations in all canal types.…”

Section: ⅳ Discussionmentioning

confidence: 99%

Comparison of shaping ability between single length technique and crown-down technique using Mtwo rotary file

Lim

Park

Hur

et al. 2007

J Korean Acad Conserv Dent

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Comparison of shaping ability between single length technique and crown-down technique using Mtwo rotary file Ⅰ. INTRODUCTIONRoot canal preparation with nickel-titanium (NiTi) rotary instruments is easier and faster than with hand instruments 1) . NiTi instruments have two to three times higher elastic flexibility and a superior resistance to torsional fracture, compared with similar-sized conventional stainless steel instruments [1][2][3][4][5] . Also, rotary instrumen- The aims of this study were to compare the shaping effect and safety between single length technique recommended by manufacturer and crown-down technique using Mtwo rotary file and to present a modified method in use of Mtwo file.Sixty simulated root canal resin blocks were used. The canals were divided into three groups according to instrument and the manner of using methods. Each group had 20 specimens. Group MT was instrumented with single length technique of Mtwo, group MC was instrumented with crowndown technique of Mtwo and group PT was instrumented with crown-down technique of ProTaper. All of the rotary files used in this study were operated by an electric motor. The scanned canal images of before and after preparation were superimposed. These superimposed images were evaluated at apical 1 to 8 mm levels. Angle changes were calculated. The preparation time, weight loss, instrument failure and binding, canal aberrations, and centering ratio were measured. Statistical analysis of the three experimental groups was performed with ANOVA and Duncan' s multiple range tests for post-hoc comparison and Fisher' s exact test was done for the frequency comparison.In total preparation time, group MT and group MC were less than group PT. In the aberrations, group MT had more elbows than those of group MC and group PT. The binding of group MC was least and group MT was less than group PT (P < 0.05).Under the condition of this study, crown-down technique using Mtwo rotary file is better and safer method than single length technique recommended by the manufacturer. [J Kor Acad Cons Dent 32(4):385-396, 2007]

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“…Many studies have been conducted to compare the separation resistance and/or analyze the cause of separation of various NiTi instrument systems [12][13][14][15][16] . Some of the procedures used include the cyclic fatigue test 17) , the bending test 18,19) , differential scanning calorimetry 20) , and the nano-indentation test 21) .…”

Section: Introductionmentioning

confidence: 99%

Correlation between cyclic fatigue and the bending properties of nickel titanium endodontic instruments

et al. 2014

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The effects of cyclic fatigue on bending properties of NiTi endodontic instruments were investigated. Sixteen Profiles ® were divided into two groups (A, and B). The sequence of cantilever bending test and cyclic fatigue test was alternated repeatedly until file separation occurred. In the cyclic fatigue test, the instrument curvature was 19° in group A and 38° in group B. Fractographic examination was performed to determine fracture patterns. In group A, there were significant differences between the bending load values measured before the cyclic fatigue test and the last cantilever bending test before instrument fracture at each deflection (p<0.05). Fractographic examination showed the specific patterns of cyclic fatigue fracture. The stress required to induce martensitic transformation might be reduced due to the softening behavior caused by the cyclic fatigue under the relaxation condition of the superelasticity range (group A). The SEM images were able to display specific patterns indicating cyclic fatigue fracture.

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Comparative Analysis of Torsional and Bending Stresses in Two Mathematical Models of Nickel-Titanium Rotary Instruments: ProTaper versus ProFile

Cited by 191 publications

References 15 publications

Finite Element Analysis of Stress Distribution on Canal Walls While Preparation of Curved Canals

Finite Element Analysis of Stress Distribution on Canal Walls While Preparation of Curved Canals

Comparison of shaping ability between single length technique and crown-down technique using Mtwo rotary file

Correlation between cyclic fatigue and the bending properties of nickel titanium endodontic instruments

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