Damage to Root Dentin During Retreatment Procedures

Shemesh, Hagay; Roeleveld, Alida C.; Wesselink, Paul R.; Wu, Min-Kai

doi:10.1016/j.joen.2010.10.002

Cited by 104 publications

(115 citation statements)

References 17 publications

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“…Among those factors are rotary NiTi instrumentation (Hin et al 2013), taper of the instrumentation files ), obturation Shemesh et al 2010), retreatment (Shemesh et al 2011;Topcuoglu et al 2014), post placement (Gluskin et al 1995), crosssectional shape of the roots (Gutmann 1992), high concentration of sodium hypochlorite (Shemesh 2015), age changes (PradeepKumar et al 2017), and parafunctional stresses (Cameron 1964). In this review, we will focus on the effects of instrumentation, obturation, and retreatments.…”

Section: Etiologymentioning

confidence: 99%

“…The presence of a filling material adds resistance that requires increased mechanical stress when compared to primary root canal treatment. One of the consequences shown in ex vivo studies is increased formation of dentinal defects in the canal walls for both NiTi rotary and hand instrument techniques (Shemesh et al 2011;Topcuoglu et al 2014). It also has been speculated that the increased formation of dentinal defects in retreated teeth can explain why the rate of healing after retreatment is lower than the rate of primary root canal treatment (Shemesh et al 2011).…”

Section: Retreatmentmentioning

confidence: 99%

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Root-originating dentinal defects: methodological aspects and clinical relevance

2017

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It was in the 1980s when the association between root-filling procedures and dentinal microcracks was made. Nowadays, root-originating microcracks, also known as dentinal defects, are recognized as a possible precursor that is part of the longitudinal process of root-originating fractures. The presence of dentinal defects has been shown to significantly decrease the outcome through a periapical microsurgery model. Several in vitro articles have been published in the past years in regards to dentinal defects, but most of them have serious methodology concerns that will be discussed in this review. A total grasp of the development and the role dentinal defects play in endodontics is crucial to the specialty. This review aims to discuss dentinal defects and their causative factors and the research models that have been used and their clinical significance. Through a comprehensive critical review of the literature, this article will express the need for further in vivo clinical research and better ex vivo methods that can replicate the clinical setting to answer several remaining questions about the development of and the role dentinal defects play in endodontics.

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Section: Etiologymentioning

confidence: 99%

Section: Retreatmentmentioning

confidence: 99%

Root-originating dentinal defects: methodological aspects and clinical relevance

2017

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“…Gözlemcilerin kararsız kaldıkları durumda, üçüncü bir gözlemcinin değerlendirmesine başvuruldu. Defektler Shemesh ve arkadaşlarının 17 kriterlerine göre değerlendirildi. Kök dentini üzerinde herhangi bir mikro çatlak, çatlak çizgisi ya da kırık varlığı; kök dentininde 'çatlak var' olarak değerlendirildi (Resim 1).…”

Section: Tfa Grubuunclassified

Evaluation of Dentinal Defects After Different Root Canal Preparation Techniques

Kaval¹,

Bilgi²,

Demirci³

et al. 2017

EÜ Dişhek Fak Derg

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ÖZET AMAÇ: El eğeleri, nikel-titanyum döner eğeler ve resiprokal sistemler ile kök kanallarının genişletilmesi sonrası, kök dentininde meydana gelen defektlerin incelenmesi amaçlandı. YÖNTEM: Çalışmamizda aynı boyutta, kök ucu gelişimi tamamlanmış, 60 adet maksiller santral kesici diş kullanıldı. Herhangi bir işlem uygulanmayan 12 adet diş kontrol grubunu oluşturdu ve kalan 48 adet diş her grupta 12 adet diş olacak şekilde 4 farklı gruba ayrıldı. Dişler Hedström tipi el eğeleri, Protaper Universal (PTU) (Dentsply Maillefer, Balligues, İsviçre), Reciproc (VDW, Münih, Almanya) ve Twisted File Adaptive (TFA) (SybronEndo, Orange, CA) sistemleri ile şekillendirildi. Dişlerden, apeksten 3, 6 ve 9 mm uzaklıkta olacak şekilde kesitler alındı ve örnekler 25 X büyütme altında steoromikroskop ile incelendi. Örnekler deney gruplarını bilmeyen iki gözlemci tarafından değerlendirildi. Gözlemciler arası uyum Kappa testi ile, deney grupları arasındaki fark ise Ki kare testi ile istatistiksel olarak analiz edildi (α= 0,05). BULGULAR: Reciproc grubunda, TF Adaptive ve kontrol grubuna göre daha fazla sayıda defekt meydana geldi (P < 0.05). Gruplar arasında yapılan diğer tüm karşılaştırmalarda istatistiksel olarak anlamlı farklılık tespit edilmedi (P > 0.05). SONUÇ: Bu ex vivo çalışmanın sınırları dahilinde, dentin defektlerinin dağılımı incelendiğinde, TFA sistemini geniş ve düz köklü dişlerin kök kanal genişletmesinde güvenli bir şekilde kullanılabileceği sonucuna ulaşılmıştır. Bununla birlikte, araştırmamızda elde edilen bulguların klinik çalışmalarla da değerlendirilmesinin uygun olacağı düşünülmektedir.

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“…It is as yet unclear whether craze lines and incomplete cracks may propagate into complete cracks and fractures after completion of the root canal treatment. In addition, following treatment procedures such as post-space preparation or retreatment are discussed as cofactors for the development of dentinal defects or fractures [1,[23][24][25].…”

Section: Brazilian Research Inmentioning

confidence: 99%

Prevalence of Dentinal Defects after Root Canal Preparations in Molars with Reciproc and WaveOne Systems

Amaral

Santos

Salazar-Silva

et al. 2016

Pesqui. bras. odontopediatria clín. integr.

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Objective: To evaluate the prevalence of dentin defects, including partial and complete cracks and fractures, after root canal preparation in molars with Reciproc and WaveOne reciprocating instruments. Material and Methods: Fifty mandibular first and second molars with mature apices were selected to endodontic in vitro instrumentation. Ten teeth were unprepared and served as the control, and the remaining forty teeth were divided into two groups, being twenty corresponding to each reciprocating system. Reciproc and WaveOne systems were used in a reciprocating working motion, under the same conditions, to prepare the two mesial canals. Roots were then sectioned 2, 4 and 6 mm from the apex, and the cut surface was observed under a microscope using 20-fold magnification and checked for the presence of fractures and incomplete cracks. Results: none of the evaluated groups presented fractures, and the control group showed no incomplete cracks. Overall evaluation showed statistical differences between these two groups and the control group (p=0.017) for the prevalence of incomplete cracks, but no significant differences were obtained between Reciproc and WaveOne groups (p>0.05). Reciproc group presented more incomplete cracks on 4-mm sections compared with the control group on the same section (p=0.0326). Conclusion: Root canal preparation with both reciprocating instruments resulted in incomplete cracks, but not fractures. At the level of 4 mm from the apex of the canals, the Reciproc system produced significantly more incomplete cracks. Considering both systems, WaveOne utilization resulted in lesser structural alterations on dentin considering the middle portion of the roots.

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Damage to Root Dentin During Retreatment Procedures

Cited by 104 publications

References 17 publications

Root-originating dentinal defects: methodological aspects and clinical relevance

Root-originating dentinal defects: methodological aspects and clinical relevance

Evaluation of Dentinal Defects After Different Root Canal Preparation Techniques

Prevalence of Dentinal Defects after Root Canal Preparations in Molars with Reciproc and WaveOne Systems

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