Computed tomography evaluation of residual root thickness after pre-flaring using gates Glidden drills: The sequence effect

Abstract

Aim:The aim of the present study is to evaluate the residual root thickness in mesiolingual (ML) canals of mandibular molars after pre-flaring using different sequences of Gates-Glidden (GG) drills.Materials and Methods:Computed tomography (CT) scans of the ML canals of 60 mandibular first molars were provided from areas within 1, 2, 3 and 4 mm of the furcation area and minimum initial root thickness (MIRT) of concave areas was measured at each level. The samples were divided into two groups (G1 and G2) which were prepared by the step-back and crown-down techniques, respectively. In both groups, anti-curvature filing was used. On secondary CT images of the samples in the same position, the minimum residual root thickness (MRRT) and the amount of removed dentin were analyzed by t-test and ANOVA.Results:There was no significant difference for MIRT between the two groups. The MRRT was greater in the G2 group in all the sections, with no significant difference between them. The average of MRRT was not <0.5 mm in any of the groups or sections.Conclusion:Based on the results of this study when the appropriate root thickness is present initially, GG drills used in any sequence may be suitable, safe and cost effective for pre-flaring of mesial canals of mandibular first molars with preserving the root thickness of furcation areas.

The minimum residual root thickness after using ProTaper, RaCe and Gates-Glidden drills: A cone beam computerized tomography study

“…Numerous studies have compared the Ni-Ti files,[ 17 19 ] but few have evaluated coronal enlargers. [ 20 21 22 ] The aim of this study was to evaluate the minimum residual root thickness (MRRT) of danger zone after canal preparation using GG drills, ProTaper and RaCe rotary files in MB canals of mandibular first molars by cone beam computerized tomography (CBCT).…”

The Effect of Gates-Glidden Drills on the Quality of Root Canal Treatment by Pre-Clinical Dental Students

“…They reported the incidence rates of 5% and 2% for transportation and perforation in the 8-step technique, respectively, and frequency rates of 17%, 7% and 6% for transportation, perforation and canal obstruction in the step-back technique, respectively. To verify the effect of canal shape on the incidence of error, Yin et al, [ 22 ] demonstrated that in the curved canals, the rotary and manual systems manifested different performance regarding the incidence of error and cleaning the surface of the canal.…”

Estudo in vitro da espessura de dentina presente nas raízes mesiais de molares inferiores em relação à zona de risco

“…O desgaste compensatório favorece também a remoção de tecido infectado e a mecânica de irrigação dos fluidos. (BUSQUIM; DOS SANTOS, 2002;GULABILAVA et al, 2010;LAZZARETTI et al, 2006; WU; VAN DER SLUIS;WESSELINK, 2005) Estrela et al (1990 relataram que o uso das brocas de GG #3 a 2 a 3 mm da furca proporcionaram desgaste significativos, ocorrendo um caso de perfuração, enquanto Akhlaghi et al (2015) avaliaram a espessura da raiz residual da zona de risco após o pré-alargamento do canal MV dos primeiros molares inferiores, utilizando: Protaper ® , Race ® e Gates Glidden. Os dentes foram avaliados com auxílio da tomografia computadorizada com feixe cônico (CBCT).…”

“…(ESTRELA et al, 1990;ISOM;MARSCHALL;BAUMGARTNER, 1995;KUTTLER et al, 2004) E há ainda aqueles que defendem o uso dessas brocas para a realização do preparo do canal, afirmando serem seguras quando usadas adequadamen-te. (AKHLAGHI et al, 2015;COUTINHO FILHO et al, 2001;WU;VAN DER SLUIS;WESSELINK, 2005) Em alguns trabalhos, as brocas de Gates Glidden promovem desgastes significativos na zona de risco, porém sem relato de perfurações. (COUTINHO FILHO et al, 2001;PALO et al, 2006).…”

“…Porém, mesmo com o uso de técnicas e novos instrumentos, nossa maior preocupação é obter melhores resultados na terapia de canais curvos, sem comprometer a zona de risco. (AKHLAGHI et al, 2015;BRUNSON et al, 2010;SHIN et al,2010;WALIA;BRANTLEY;GERSTEIN,1988) Com vistas a estudar a terapia dos canais radiculares curvos, preservando a zona de risco, o presente estudo tende a mensurar a raiz mesial de molares inferiores. Para tanto,é necessário o conhecimento da anatomia e da espessura denti nária na zona de risco para garanti r segurança nos tratamentos endodônti cos e prevenção de rasgos e perfurações.…”