Shaping ability of progressive versus constant taper instruments in curved root canals of extracted teeth

Yang, Guobin; Zhou, Xue; Zheng, Yu-Lu; Zhang, H.; Shu, Yi; Wu, Hongkun

doi:10.1111/j.1365-2591.2007.01296.x

Cited by 46 publications

(52 citation statements)

References 24 publications

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“…Compared with other rotary systems, it is significantly faster in instrumentation (2), resulting in more tapered preparations, mainly in the cervical and middle thirds (3,4).…”

mentioning

confidence: 99%

Comparison of Two Rotary Systems in Root Canal Preparation Regarding Disinfection

Machado

Sapia²,

Cai

et al. 2010

Journal of Endodontics

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“…Compared with other rotary systems, it is significantly faster in instrumentation (2), resulting in more tapered preparations, mainly in the cervical and middle thirds (3,4).…”

mentioning

confidence: 99%

Comparison of Two Rotary Systems in Root Canal Preparation Regarding Disinfection

Machado

Sapia²,

Cai

et al. 2010

Journal of Endodontics

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“…In Hero Shaper, helical angle of cutting edges varies from tip to the shank and adapted pitch, i.e., pitch varies according to taper, positive rake angle, large inner core, and three edges. 15,16 They tend to generate greater stress on the root walls and possess relatively low flexibility. Higher stress induction on the walls is due to greater number of rpm, resulting in faster and more aggressive cutting.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Dentinal Defects induced by Hand Files, Multiple, and Single Rotary Files: A Stereomicroscopic Study

Choudhary¹,

Jain²,

Bhadoria³

et al. 2017

World Journal of Dentistry

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Aim: This study was carried out to compare the dentinal defects induced by single rotary file system, multiple rotary file system, and hand files. Materials and methods:Sixty single-rooted premolars were selected based on predetermined criteria. They were divided into three groups: Group I (hand K files), group II (Hero Shaper), and group III (One Shape). Biomechanical preparation was carried out as per the manufacturer's instructions. Each specimen was sectioned horizontally and divided into apical, middle, and coronal sections. These sections were visualized under stereomicroscope to evaluate the dentinal defects using predetermined criteria.

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“…Yang ve arkadaşları (22), eğri kök kanallarına sahip çekil-miş dişlerde ProTaper ve HeroShaper sistemlerinin şekillen-dirme yeteneklerini inceledikleri çalışmalarında her iki sistemin de güvenli ve çalışma boyunca kayıp oluşturmadan şekillendirme yaptıklarını rapor etmişlerdir. HeroShaper sistemi ile şekillendirdikleri kanallarda daha az transportasyon ve apikal alanda daha iyi bir merkezi şekillendirme oluştu-ğunu belirtmişlerdir.…”

Section: şEkilunclassified

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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Shaping ability of progressive versus constant taper instruments in curved root canals of extracted teeth

Abstract: Both instrument systems were safe to use and maintained working length well. The canals prepared with Hero Shaper had less transportation and were better centred in the apical region, possibly because their smaller taper reduced instrument stiffness.

Cited by 46 publications

References 24 publications

Comparison of Two Rotary Systems in Root Canal Preparation Regarding Disinfection

Comparison of Two Rotary Systems in Root Canal Preparation Regarding Disinfection

Comparison of Dentinal Defects induced by Hand Files, Multiple, and Single Rotary Files: A Stereomicroscopic Study

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

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