The impact of irrigation protocols on epoxy sealer penetration depth in dentinal tubules. Study involving laser confocal microscopy

The aim of this study was to investigate the suitability of rhodamine B dye staining of an epoxy resin sealer (AH Plus) and calcium-silicate-based sealers (Total Fill BC Sealer, BioRoot RCS) to represent the penetration depth of the sealers into dentinal tubules after root canal obturation. In a three-step process, (1) leaching of rhodamine B from sealers into a buffer solution, (2) passive penetration of leached rhodamine B into dentinal tubules, and (3) conformity of rhodamine B penetration assessed by confocal laser scanning microscopy (CLSM), and sealer penetration assessed by scanning electron microscopy (SEM), in root-canal-filled teeth, were evaluated. Rhodamine B dye massively leached out of Total Fill BC Sealer and BioRoot RCS into the phosphate-buffered saline (PBS). A pinkish coloration of AH Plus was found after contact with PBS. Leached rhodamine B dye passively penetrated dentinal tubules from all three sealers when placed on root dentin. No correlation was observed between sealer penetration in SEM and rhodamine B penetration in CLSM. Staining of sealers using rhodamine B is an inadequate method with which to evaluate sealer penetration depth into dentinal tubules, as it overestimates the penetration of sealers into root dentin tubules.

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Experimental Examination of the Impact of Tool Radius on Specific Energy in Microcutting of Granite

Journal of Engineering Materials and Technology ◽

10.1115/1.4036585 ◽

2017 ◽

Vol 139 (4) ◽

Cited By ~ 1

Author(s):

Miloš Pjević ◽

Ljubodrag Tanović ◽

Goran Mladenović ◽

Biljana Marković

Keyword(s):

Cutting Force ◽

Penetration Depth ◽

Specific Energy ◽

Brittle Materials ◽

Experimental Examination ◽

Workpiece Surface ◽

Different Shapes ◽

Tip Radius ◽

The Impact ◽

Force Intensity

The paper presents experimental results of microcutting brittle materials (granite). The analysis was conceived on the observed interaction between the workpiece and two tools of different shapes. Experiment was based on scratching the workpiece surface with diamond tools. Applied tools had tip radius R0.2 and R0.15 mm. The experiment determined the changes in the value of perpendicular and tangential components of the cutting force based on the geometric properties of tools, as well as the changes of the specific energy of microcutting granite (Jošanica and Bukovik types). The experiment has shown that reduction of tool radius causes reduction of the cutting force intensity and specific cutting energy. Because of its physical/mechanical properties, more energy is required for micromachining granite “Jošanica” than “Bukovik.” Based on the topography of the surface, the value of critical tool penetration depth was established, after which the brittle fracture is no longer present. For granite “Jošanica” values of critical penetration depth are 6 and 5 μm when micromachining with tools R0.2 and R0.15 mm, while for Bukovik those values are 6.5 and 5.5 μm. The paper should form the basis for understanding the phenomena which occur during microcutting brittle materials.

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Evaluating Penetration Depth of Treatment Fluids into Dentinal Tubules Using the GentleWave System

Dentistry ◽

10.4172/2161-1122.1000366 ◽

2016 ◽

Vol 06 (03) ◽

Cited By ~ 7

Author(s):

Prashanthi Vandrangi

Keyword(s):

Penetration Depth ◽

Dentinal Tubules

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High-speed impacts of slender bodies into non-smooth, complex fluids

Journal of Fluid Mechanics ◽

10.1017/jfm.2018.938 ◽

2018 ◽

Vol 861 ◽

Cited By ~ 1

Author(s):

Ishan Sharma

Keyword(s):

Penetration Depth ◽

High Speed ◽

Complex Fluids ◽

Laboratory Data ◽

Impact Speed ◽

High Speed Impact ◽

Smooth Complex ◽

Theoretical Predictions ◽

Slender Bodies ◽

The Impact

We present a simple hydrodynamical model for the high-speed impact of slender bodies into frictional geomaterials such as soils and clays. We model these materials as non-smooth, complex fluids. Our model predicts the evolution of the impactor’s speed and the final penetration depth given the initial impact speed, and the material and geometric parameters of the impactor and the impacted material. As an application, we investigate the impact of deep-penetrating anchors into seabeds. Our theoretical predictions are found to match field and laboratory data very well.

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