NEET MDS Shorts
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PeriodonticsA soft bristle brush is the most effective tool for removing plaque after the application of a disclosing solution. It allows for thorough cleaning of the tooth surfaces, including areas that may be difficult to reach with other methods.
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ProsthodonticsThe chamfer finish line has the highest risk of leaving unsupported enamel because it creates a curved transition that may leave thin, fragile enamel edges. The shoulder provides definite support, the shoulder with bevel adds strength, while the bevel alone provides gradual transition. The chamfer's curved nature can result in inadequate support for thin enamel margins.
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NEETMDSPre-carve burnishing of amalgam is performed to remove excess mercury, improve the adaptation (condensation) of the amalgam at the margins, and initiate the carving process. It does not increase the setting time of the amalgam.
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Conservative Dentistry
The bonding in porcelain fused to metal (PFM) restorations is achieved through a combination of both chemical and mechanical mechanisms.
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Dental Materials
The typical mixing ratio for zinc polycarboxylate cement is 1:2 (powder to liquid).
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MicrobiologyIn concentrations usually applied for sterilization purposes, ethylene oxide is preferable to formaldehyde becuase it is more penetrating
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Dental Materials
Phosphoric acid concentrations between 20% and 30% are commonly used for acid etching of enamel to create a roughened surface for mechanical bonding of restorative materials.
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EndodonticsLentulo spirals are used for application of root canal sealer. These instruments: 1) Have a spiral design that rotates counterclockwise at low speed, 2) Carry sealer into the canal and coat the walls evenly, 3) Ensure proper sealer distribution before gutta-percha placement, 4) Help achieve intimate contact between sealer and canal walls, 5) Are sized to match canal preparation dimensions. They are NOT used for locating orifices, pulp extirpation, or canal enlargement. Proper sealer application is crucial for achieving optimal obturation quality.
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Oral PathologyDiastema (spacing between teeth) is never directly associated with TMJ pathosis. TMJ disorders commonly cause open bite due to condylar resorption or growth disturbances, closed bite due to posterior teeth super-eruption, and traumatic occlusion due to altered mandibular positioning. Diastema is typically related to tooth size-arch length discrepancies, developmental factors, or periodontal disease, not TMJ dysfunction.
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NEETMDS
The ceramic used in porcelain fused to metal (PFM) restorations consists of low fusing porcelain.
Low fusing porcelains have a firing temperature range of approximately 850–1100°C (1562–2012°F)