NEET MDS Shorts
19186
Dental Materials
The specification requires that amalgam neither contract nor expand more than 20 µm/cm.
59502
MedicineMucoepidermoid carcinoma is the most common malignant salivary gland tumor found in children and adolescents
29031
General PathologyLow serum cortisol is not a typical laboratory finding in Cushing's syndrome, where high serum cortisol is expected.
95433
Oral PathologyKeratosis follicularis (Dariers disease) is characterized by defective adhesion between epithelial cells due to mutations in ATP2A2 gene affecting calcium regulation and cell adhesion. This leads to acantholysis and characteristic histologic findings. White sponge nevus involves keratin mutations, and pachyonychia congenita affects nail and skin keratinization, but keratosis follicularis specifically shows defective intercellular adhesion.
34424
Physiology
Answer: 3) The sympathetic nervous system is regulated by the spinal cord through the sympathetic chain ganglia, which receive input from the hypothalamus and other higher centers.
26655
ProsthodonticsWhich of the following is likely to occur if the VDO is increased in a complete denture patient: clicking of teeth.
97941
Pharmacology
Alkalinization of urine is used in patients receiving high dose methotrexate to promote renal excretion and to avoid nephrotoxicity IV Sodium bicarbonate is used to maintain urine pH above 7.0 to avoid precipitation of methotrexate (a weak acid) in the acid pH of renal tubules
10141
General Medicine
ETEC are the principal cause of traveler’s diarrhe1) They produce both a heat-labile toxin (LT) and a heat-stable toxin (ST) that act on the intestinal mucos1) The LT is similar to cholera toxin and increases intracellular cGMP levels, leading to enhanced fluid and electrolyte secretion into the lumen and thus diarrhe1) The ST acts by a different mechanism but also enhances fluid and electrolyte secretion.
86235
EndodonticsWhen it comes to assessing the success of endodontic therapy, the changes that occur in the periapical region are crucial indicators. A successful treatment typically results in the formation of new cementum, regeneration of the alveolar bone, and regeneration of the periodontal ligament. These processes are all part of the body's natural healing response to the removal of infection and the introduction of a biocompatible filling material in the root canal system. Thus, all of the above factors contribute to the overall success of the treatment.
18571
Dental Materials
Main causes of the porosity of alloy castings are:
1) Solidification defects
2) Trapped gases
3) Residual air
1. Solidification defects
Solidification defects cold lead to two different manifestations of porosity;
localised shrinkage porosity and Microporosity.
Localised shrinkage porosity is caused by insufficient feeding of the alloy
during solidification.
Microporosity is also caused by solidification shrinkage, but generally happens
in fine grain alloys when the solidification is too rapid for the microvoids to
segregate. This in turn is caused the mould or casting temperature being too
low.
2. Trapped gases
Many metals dissolve or occlude gases when they are molten. On solidification,
these gases are forced out of the casting causing what is usually called pinhole
porosity. These voids are rather small.
3. Incomplete casting
If the molten alloy is prevented from fully or partially filling the mould and
incomplete or even no casting at all can result.