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Alpha micropolish

Manufactured by Buehler
Sourced in United States

The Alpha Micropolish is a precision polishing compound designed for high-quality surface finishing. It is a fine-grained abrasive material used to smooth and refine surfaces, particularly in the field of materials science and engineering.

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4 protocols using alpha micropolish

1

Interfacial Gap Analysis of Resin Composites

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Immediately after setting (i.e., at 3 min after the start of light activation) or after storage in distilled water at 37°C for one day, excess composite restorative material on each restoration surface was removed by wet grinding on #600 carborundum paper. This was followed by polishing with linen and an aqueous alumina slurry (Alpha Micropolish, Buehler, Chicago, IL, USA). Then, distilled water was used for rinsing to avoid desiccation and erosion.
Each tooth was sectioned in a buccolingual direction through the center of the restoration with a low-speed diamond saw (IsoMet, Buehler, Lake Bluff, IL, USA). The presence or absence of interfacial gaps [14 (link)] was inspected and measured at 14 points, labelled as Point #1 to Point #14, each 0.5 mm apart (Fig 1), along the interface between the restoration and cavity walls (n = 10; total points measured per resin composite = 140). Inspection and measurements were carried out using a measurement microscope at ×1,000 magnification (Measurescope MM-11, Nikon, Tokyo, Japan), with the cavity walls and cavity floor of each half of the sectioned tooth facing up. At 3 min after the start of light activation or after one-day storage, the number of gaps at each measurement point (Point #1 to Point #14) in each tooth was summed up for each resin composite restorative material [14 (link), 15 (link)].
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2

Evaluating Resin Composite Restoration Margins

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One cavity was prepared in each of 180 teeth (9 resin composite restorative materials × 2 polishing times × 10 replicates), using the same, standardized cavity dimensions and preparation and restoration procedures described in subsection 2.3 for Class I cavities. Immediately after light-curing, excess composite restorative material on each restoration surface was removed by wet grinding on #600 carborundum paper. This was followed by polishing with linen and an aqueous alumina slurry (Alpha Micropolish, Buehler, Chicago, IL, USA).
Cavosurface margin on the enamel surface of each restoration (Fig 2) was inspected using a measurement microscope at ×1,000 magnification (Measurescope MM-11, Nikon, Tokyo, Japan). Maximum gap-width and opposing width (if any) between the restorative material and enamel margin was recorded [11 (link), 12 (link)]. Maximum gap-widths in each tooth (n = 10) were summed up for each resin composite restorative material.
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3

Microstructural Characterization of NiTi Alloy

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The cross-sections of five NiTi cylindrical specimens (one specimens from each group) were polished with a standard sequence of abrasives (Carbimet Paper Discs, Buehler: 240 and 600 grit) and alumina paste (Alpha Micropolish, Buehler: 6 μm, 1 μm and 0.5 μm particle sizes). The polished surfaces were etched using an etching solution of composition HF + HNO3 + H2O with a volume ratio of 1:4:5 by swabbing technique.[16 ] The microstructures of the specimens were examined with an optical microscope (Leica DM4000M LED; Leica Microsystems CMS GmbH, Germany) and an scanning electron microscope (SEM) (CX-200; Coxem Ltd., Daejeon, South Korea). Magnifications ranging from ×50 to ×2000 were used with the optical microscope and SEM. The grain size was calculated using the line intercept method on the optical microscope.[17 ] Forty-five lines per mm were used for the calculation in both vertical and horizontal direction. The elemental composition of different zones namely, the matrix, grain boundaries, martensitic variants and precipitates was determined for the SM alloy using scanning electron microscope (CX-200; Coxem Ltd., Daejeon, South Korea) coupled to energy dispersive X-ray spectrometer (SEM-EDS). The quantitative analysis was performed in nonstandard analysis mode employing ZAF correction methods using the software.
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4

Vickers Hardness Measurement of Cylindrical Specimens

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All cylindrical specimens (3/group) were mounted and the cut surface was ground and polished with sandpaper (Carbimet Paper Discs, Buehler: 240 and 600 grit) in a polishing machine (Bainpol, Chennai Metco Pvt Ltd, Chennai, India). Final polishing was done with alumina paste (Alpha Micropolish, Buehler: 6 μm, 1 μm and 0.5 μm particle sizes). Hardness measurements were performed in each specimen with Vicker's hardness tester (VM-50, Fuel Instruments and Engineers Pvt. Ltd., Kohlapur, India) at room temperature with 5 kg load and 15 s dwell time. Five indentations were made in each specimen with a square-based pyramidal diamond indenter at the center and at equidistant adjacent locations in each specimen (n = 15). The two diagonals of the indentations were measured to the nearest 0.1 μm with a filar micrometer and averaged. Hardness was taken as the maximum force divided by the area of contact.
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