Residual dentin thickness in mesial roots of mandibular molars prepared with Lightspeed rotary instruments and Gates-Glidden reamers

Zuckerman, Offer; Katz, Alexander; Pilo, Raphael; Tamse, Aviad; Fuss, Zvi

doi:10.1016/s1079-2104(02)91710-5

Cited by 38 publications

(43 citation statements)

References 23 publications

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“…The present study found similar rates of dentin removal compared to previous studies 4,[9][10][11][12][13][14][15]24 .…”

Section: Discussionsupporting

confidence: 87%

“…The cervical preflaring is also recommended to favor the work length determination, the apical diameter, as well as to facilitate canals irrigation and filling [5][6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

“…The first rotating instruments developed for cervical preflaring were Gates-Glidden (GG) drills 1 , with a GG tip diameter # 2 of 0.70 mm, considered safe for lower molars mesial canals [9][10][11] . On the other hand, as they were made of stainless steel and had limited flexibility, their use leads to risks especially in the lower molars mesial root, as its excessive enlargement may lead to wear of lateral perforation of the root, named "Strip Perforation" 10,11 .…”

Section: Introductionmentioning

confidence: 99%

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The dentin thickness remaining in the risk zone of mandibular molars after cervical preflaring with four methods

Pinto

Marceliano-Alves

Lins

et al. 2016

Rev. odontol. UNESP

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ResumoIntrodução: O preparo cervical é uma etapa importante da instrumentação do sistema de canais, mas pode levar ao alargamento excessivo ou rasgo da raiz. Objetivo: Avaliar, em tomografia computadorizada cone beam, da espessura remanescente de dentina cervical da raiz mesial de molares inferiores, após o preparo com diferentes técnicas: Gates-Glidden (ordem crescente); Gates-Glidden (ordem decrescente); LA Axxess e Easy Pro-Design. Material e método: Foram selecionadas 40 raízes mesiais de molares inferiores, que foram escaneadas em tomógrafo cone beam antes e após o preparo. Das imagens tomográficas foram obtidos cinco cortes com intervalo de 1 mm a partir da furca e, então, mensurada a variação da espessura entre o canal radicular até a porção externa da raiz em software de análise. Resultado: Avaliação dos diferentes níveis demonstraram ausência de significância dentro do mesmo grupo para o grupo das Gates-Glidden. Por outro lado, foi notada diferença para LA Axxess (p=0,002) e para Easy Pro-Design (p=0,005). Na avaliação entre os grupos, foi observada diferença em todos os níveis, sobretudo, para Gates-Glidden na ordem crescente (ANOVA e Tukey). Conclusão: Considerando as limitações desse estudo, concluiu-se que o protocolo que apresentou maior desgaste da área de perigo cervical foi o da Gates-Glidden em ordem crescente, sendo que os demais grupos foram equivalentes (p>0,05).Descritores: Instrumentos odontológicos; preparo de canal radicular; tomografia computadorizada de feixe cônico. AbstractIntroduction: Cervical preflaring is an important step of the canal system instrumentation, but can lead to excessive enlargement or root perforation. Objective: Evaluate the remaining dentin thickness in the mandibular molars of mesial roots using cone beam computed tomography: Gates-Glidden (crown-down); Gates-Glidden (step-back); LA Axxess and Easy Pro-Design. Material and method: Were selected 40 lower molars mesial roots, which were scanned in a cone beam CT scanner before and after preparation. Were obtained five sections of the CT images with an interval of 1 mm from the furcation, and measured the thickness variation between the root canal to the root external portion in analysis software. Result: The evaluation of the different levels showed no significance within the same group for the Gates-Glidden group. On the other hand, were observed difference for LA Axxess (p=0.002) and Easy Pro-Design (p=0.005). In the intergroup analysis, were observed difference in all levels, especially for Gates-Glidden in the ascendant order (ANOVA and Tukey). Conclusion: Within the limitations of these study, is possible to conclude that the protocol with greater wear in the cervical risk area was the Gates-Glidden in step-back sequence, as the other groups were equivalent (p>0.05).

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“…The present study found similar rates of dentin removal compared to previous studies 4,[9][10][11][12][13][14][15]24 .…”

Section: Discussionsupporting

confidence: 87%

“…The cervical preflaring is also recommended to favor the work length determination, the apical diameter, as well as to facilitate canals irrigation and filling [5][6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The dentin thickness remaining in the risk zone of mandibular molars after cervical preflaring with four methods

Pinto

Marceliano-Alves

Lins

et al. 2016

Rev. odontol. UNESP

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“…Seguindo a classificação de VERTUCCI (1984), foram incluídos neste estudo raízes mesiais do tipo IV com dois canais independentes, da câmara pulpar até o ápice radicular, e que apresentavam ângulo e raio de curvatura acentuados. O ângulo de curvatura dos canais foi definido pelo método de SCHNEIDER (1971) conforme trabalhos previamente realizados (CONTRERAS et al, 2001;ZUCKERMAN et al, 2003;KUTLER et al, 2004;WU et al, 2005;SCHMITZ et al 2008;VERSIANI et al, 2008;PASTERNAK-JUNIOR et al, 2009;FORNARI et al, 2010;NIELSEN et al, 2010). Para a mensuração do raio de curvatura utilizou-se o método que incorpora a geometria do canal como fator de influência no preparo dos canais radiculares (PRUETT et al 1997).…”

Section: Discussionunclassified

“…A escolha dos instrumentos testados baseou-se no fato dos mesmos serem amplamente utilizados para o preparo do terço cervical e possuírem diferentes características (ISOM et al 1995;CONTRERAS et al, 2001;DAVIS et al, 2002;ZUCKERMAN et al, 2003;KUTLER et al, 2004;WU et al, 2005;COUTINHO-FILHO et al, 2008;NIELSEN et al 2010). A broca Gates-Glidden com forma de chama promove o preparo de formato cilíndrico proporcional ao maior diâmetro da parte ativa do instrumento (LOPES et al 1993), proporcionando com as brocas 3 e 4 cilindros de diâmetro 0,90 e 1,10 mm, respectivamente.…”

Section: Discussionunclassified

Análise, através de tomografia computadorizada, do preparo promovido pelo alargamento cervical em molares inferiores e sua influência na determinação do diâmetro anatômico apical por meio de MEV

Júnior¹

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The aim of this study was to evaluate, by means of cone beam computed tomography, the transportation, the increased of the area, and the dentine thickness of the cervical third of the root canal of thirty lower first molars prepared with different instruments and the influence of this preparation to determining the initial apical file to bind (IAI), through scanning electron microscopy. The teeth (n = 10) were fixed on three resin plates (samples) according to the instruments used in the cervical preflaring and scanned with a cone beam computed tomography device. Then, preparation was performed in the cervical third of the canals: G1 -Gattes-Glidden burs #2 and #3 in the mesial canals and #3 and #4 in the distal canal; G2 -LA Axxess #20.06 and #35.06 in the mesial canals and #35.06 and #45.06 in the distal canal. After preparation, the specimens were submitted to a new CT scan. Each canal was sized using manual K-files, starting with size 08 files, until the working length (WL) was reached. File sizes were increased until a binding sensation was felt at the WL, and the instrument size was recorded for each canal. The files were fixed with methylcyanacrylate at the WL. Teeth were then sectioned transversally 1 mm from the apex, with the binding file in the position. The apical region was then observed under a scanning electron microscope. The centering ratio showed no statistical difference between groups; the percentage of area increase after preparation showed statistical significance only in the mesio-lingual canal (P = 0.023); the thickness of the dentine in the region facing the furcation showed statistical difference only in the distal root. SEM analysis showed that the mean percentage area of the IAI in relation to the root canal area at the WL showed no statistical significant difference between groups. It was concluded that cervical preflaring with Gates-Glidden or LA Axxess did not influence the determination of the apical gauging in lower molars.

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Canal wall thickness after preparation with NiTi rotary files

Brkanic

Stojšin

Živković³

et al. 2011

Microscopy Res & Technique

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Residual dentin thickness in mesial roots of mandibular molars prepared with Lightspeed rotary instruments and Gates-Glidden reamers

Cited by 38 publications

References 23 publications

The dentin thickness remaining in the risk zone of mandibular molars after cervical preflaring with four methods

The dentin thickness remaining in the risk zone of mandibular molars after cervical preflaring with four methods

Análise, através de tomografia computadorizada, do preparo promovido pelo alargamento cervical em molares inferiores e sua influência na determinação do diâmetro anatômico apical por meio de MEV

Canal wall thickness after preparation with NiTi rotary files

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