Results: 68

Evaluation of the internal anatomy and instrumentation techniques with new mechanized instrumentation systems in second mandibular molars with fused roots

O objetivo deste estudo foi analisar por meio da microtomografia computadorizada os aspetos morfológicos e morfométricos da anatomia interna do sistema de canais radiculares com formato em C, e, avaliar a área de superfície, volume e áreas do canal não instrumentadas antes e após a instrumentaçã...

Quantitative transportation assessment in curved canals prepared with an off-centered rectangular design system

Braz. oral res. (Online); 30 (1), 2016
Abstract The purpose of this study was to assess the ability of an off-centered rectangular design system [ProTaper Next (PTN)] to maintain the original profile of the root canal anatomy. To this end, ProTaper Universal (PTU), Reciproc (R) and WaveOne (WO) systems were used as reference techniques for co...

Root filling bond strength using reciprocating file-matched single-cones with different sealers

Braz. oral res. (Online); 30 (1), 2016
Abstract The aim of the present study was to evaluate the bond strength (BS) of root canal fillings to root dentin using the reciprocating file-matched single-cone or lateral compaction techniques with resin-based and calcium-silicate-based sealers. Maxillary canine roots were prepared and filled using o...

Shaping ability of rotatory or reciprocating instruments in curved canals: a micro-computed tomographic study

Braz. oral res. (Online); 30 (1), 2016
Abstract This study aimed to compare apical transportation, centering ratio, and working time during root canal preparation with Wizard Navigator (WN), WaveOne (WO), or ProTaper Universal (PT) and to describe deformation and fracture of these instruments. Thirty-six mesiobuccal roots from maxillary molar...

Effect of nickel chloride on Arabidopsis genomic DNA and methylation of 18S rDNA

Electron. j. biotechnol; 18 (1), 2015
Background In recent years, nickel (Ni) has been widely applied in industrial and agricultural production and has become a kind of environmental pollution. In this study, the effect of nickel chloride (NiCl2) with different concentrations on Arabidopsis genomic stability and DNA methylation has been demo...

Níquel en cavidad oral de individuos con agrandamiento gingival inducido por tratamiento ortodóncico

El agrandamiento gingival es una de las alteraciones orales generadas por el uso de aparatología ortodóncica fija. Inicialmente fue descrito como producto de la respuesta alérgica del huésped al níquel, y estudios recientes demostraron que este metal induce proliferación fibroblástica. Sin embargo...

Avaliação das características superficiais de instrumentos reciprocantes por meio de microscopia eletrônica de varredura antes e após o uso

Analisou-se, por meio de MEV, instrumentos endodônticos reciprocantes de Ni-Ti, antes e após o uso, a fim de avaliar a presença de detritos, defeitos e deformações. Para tanto, vinte e seis instrumentos, foram divididos em 2 grupos, sendo 13 WaveOne® e 13 Reciproc®, os quais foram fotomicrografado...