Root Fracture
Mostrando 13-24 de 68 artigos, teses e dissertações.
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13. The impact of clinical use on the torsional behavior of Reciproc and WaveOne instruments
ABSTRACT Torsional overload is a fracture representative parameter for instruments in single-file techniques. Objective The aim of this study was to assess the influence of clinical use, in vivo, on the torsional behavior of Reciproc and WaveOne instruments considering the possibility that they degraded with use. Material and Methods Diameter at each mil
J. Appl. Oral Sci.. Publicado em: 2016-08
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14. Shaping ability of rotatory or reciprocating instruments in curved canals: a micro-computed tomographic study
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 molars were micro-computed tomography (micro-CT) scanned and
Braz. oral res.. Publicado em: 14/06/2016
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15. Effects of alpha-tocopherol on fracture resistance after endodontic treatment, bleaching and restoration
Abstract This study evaluated the effects of 10% alphatocopherol on the fracture resistance of endodontically treated teeth subjected to tooth bleaching with hydrogen peroxide and immediately restored with composite resin. Fifty bovine incisors were selected, including 10 sound teeth that constituted the control group (G1 (C)). The remaining 40 teeth, which
Braz. oral res.. Publicado em: 20/05/2016
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16. Influence of crosshead speed on failure load and failure mode of restored maxillary premolars
We analyzed the effect of the crosshead speed of an applied load on failure load and failure mode of restored human premolars. Fifty intact, noncarious human premolars were selected. Class II mesio-occlusodistal preparations were made with a water-cooled high-speed preparation machine, and the teeth were restored with composite resin. The specimens were divi
Braz. oral res.. Publicado em: 15/12/2015
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17. Cyclic fatigue resistance of two nickel-titanium instruments in different curving angles: a comparative study
The cyclic resistance of ProTaper Universal (size 25/08) and ProTaper Next (size 25/06) instruments was compared in artificial canals with different curvatures in this study. A total of 30 ProTaper Universal and 30 ProTaper Next instruments were divided into 6 groups (n = 10) and were operated into artificial canals with 3 different angles of curvature (45°
Braz. oral res.. Publicado em: 20/10/2015
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18. Detection of horizontal root fracture using four different protocols of cone-beam computed tomography
The purpose of this study was to analyze four different cone-beam computed tomography (CBCT) protocols to identify horizontal root fractures (HRF) in endodontically treated teeth, with or without the presence of a metallic post. Thirty extracted single-rooted human premolars were treated endodontically. Afterwards, an observer induced a horizontal fracture i
Braz. oral res.. Publicado em: 02/06/2015
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19. On the Strengthening of Cement Mortar by Natural Fibers
The purpose of this work is to evaluate mechanical behavior of sisal fiber reinforced cement mortar. The composite material was produced from a mixture of sand, cement and water. Sisal fibers were added to the mixture in two different lengths. Mechanical characterization of the composite and the plain mortar was carried out using three point bend, compressio
Mat. Res.. Publicado em: 2015-02
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20. Evaluation of technical quality and periapical health of root-filled teeth by using cone-beam CT
Objective This study aimed to assess the quality of root fillings, coronal restorations, complications of all root-filled teeth and their association with apical periodontitis (AP) detected by cone-beam computed tomography (CBCT) images from an adult Turkish subpopulation. Material and Methods The sample for this study consisted of 242 patients (aging f
J. Appl. Oral Sci.. Publicado em: 2014-12
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21. Influence of periodontal ligament simulation on bond strength and fracture resistance of roots restored with fiber posts
Objective: Considering that periodontal ligament simulation may influence the stress distribution over teeth restored with intraradicular retainers, this study aimed to assess the combined effect of mechanical cycling and periodontal ligament simulation on both the bond strength between fiber posts and root dentin and the fracture resistance of teeth restor
J. Appl. Oral Sci.. Publicado em: 2014-10
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22. Effect of root canal preparation, type of endodontic post and mechanical cycling on root fracture strength
Objective: To evaluate the impact of the type of root canal preparation, intraradicular post and mechanical cycling on the fracture strength of roots. Material and Methods: eighty human single rooted teeth were divided into 8 groups according to the instruments used for root canal preparation (manual or rotary instruments), the type of intraradicular post
J. Appl. Oral Sci.. Publicado em: 2014-06
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23. Effect of calcium hydroxide dressing on push-out bond strength of endodontic sealers to root canal dentin
The aim of the present study was to evaluate the effect of calcium hydroxide dressing on the bond strength of three commercially available endodontic sealers (MTA Fillapex, Sealapex, and AH Plus) to root canal dentin. Sixty slices of extracted human canines were obtained from cervical, middle, and apical root thirds. Root canals were standardized and specime
Braz. oral res.. Publicado em: 24/01/2014
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24. Root Canal Filling: Fracture Strength of Fiber-Reinforced Composite-Restored Roots and Finite Element Analysis
O objetivo deste estudo foi avaliar o efeito da técnica de obturação na resistência à fratura de raízes e analisar, por meio de análise de elementos finitos (AEF), a expansão do cimento endodôntico em duas diferentes técnicas de obturação. Trinta dentes humanos unirradiculares foram instrumentados com limas rotatórias, com um comprimento de trab
Braz. Dent. J.. Publicado em: 2013-12