NEET MDS Shorts
51245
Oral PathologyDiseases that increase oral melanin pigmentation include Addison's disease.
46890
Biochemistryâ-oxidation of fatty acid occursin Mitochondria
89542
Dental Materials
Ceramic firing involves a series of processes that transform raw clay
materials into a hard, durable ceramic product. The stages of firing can be
broken down into several steps, but the primary ones are bisque firing and glaze
firing. The bisque firing is done before glazing and is typically the first
firing in the process. The purpose of bisque firing is to remove any remaining
moisture, organic matter, and to harden the ceramic piece to a certain extent,
making it suitable for the application of glazes.
There are two main types of bisque firings:
1. Low bisque: This is a lower temperature firing, usually around 950°C to
1000°C (1742°F to 1832°F). It is used for porous clay bodies and allows for some
shrinkage to occur, but it does not fully vitrify the clay. This stage is often
referred to as the biscuit or bisque stage.
2. High bisque: This is a higher temperature firing, typically between 1000°C to
1150°C (1832°F to 2102°F). It is used for clay bodies that require a higher
degree of vitrification and strength before glazing. At these temperatures, the
clay body experiences significant chemical changes and begins to shrink more
dramatically.
The maximum shrinkage of ceramic occurs during the high bisque stage because the
clay particles undergo a process called vitrification. Vitrification is the
point at which the clay's mineral content starts to melt and fuse together,
creating a glass-like phase within the clay matrix. This results in a stronger,
less porous, and denser material. As the minerals melt and the particles bond,
the overall volume of the material decreases, causing the shrinkage.
The shrinkage rate is influenced by various factors, such as the type of clay,
its composition, water content, and the specific temperature profile of the
firing process. However, it is generally during the high bisque that the most
significant shrinkage occurs. After the high bisque, the subsequent glaze firing
is at a higher temperature, which may cause additional shrinkage, but it is
usually less substantial compared to the initial bisque firing.
64260
OrthodonticsExplanation: The philtrum is the vertical groove located in the middle of the upper lip. It is primarily formed by the fusion of the medial nasal processes, which include the globular process. The globular process is a key structure in the embryonic development of the face, contributing to the formation of the upper lip and the philtrum.
37740
General Medicine
The ATP7B protein is essential for copper excretion from hepatocytes into bile, and its deficiency leads to copper accumulation in the liver and other tissues in Wilson's disease.
36880
Oral SurgeryThe elevator which fits well in the operator's hand and can be rotated between the thumb and the finger is Warwick-James elevator.
39075
RadiologyIn the bisecting technique, the film is placed as close as possible to the tooth.
92362
General Medicine
CTPA is the most sensitive diagnostic test for pulmonary embolism, as it directly visualizes the emboli in the pulmonary arteries.
27809
ProsthodonticsWhich of the following is not a mouth temperature except Korrecta type I.
34789
Pharmacology
Isoproterenol is used in the management of bronchospasm during anesthesia; adjunctive treatment for shock.