NEET MDS Shorts
43886
Dental Anatomy
Interglobular Dentin:
Sometimes, mineralization of dentin begins in small globular areas that fail to coalesce into a homogenous mass. This results in zones of hypomineralization between the globules.
These zones are known as globular dentin or interglobular spaces. Thus, demonstrating defect of mineralization and not of matrix formation, the dentinal tubules pass uninterruptedly through interglobular dentin.
54274
Oral SurgeryNerve membrane stabilization action of local anaesthetic agents is due to preventing conductance of Na ions from the exterior of the nerve to the interior.
89089
Endodontics
Brief pain or a short-lived, sharp sensation that subsides quickly after the stimulus is removed.<br>
22013
Physiology
Endorphins, particularly ?-endorphin, are opioid peptides that act as natural painkillers. They are released during stress and pain and bind to opioid receptors in the brain and spinal cord to inhibit the transmission of pain signals. While they do have secondary effects on mood and stress response, their primary function is pain inhibition.
96035
Physiology
Umami taste is triggered by the activation of glutamate receptors present in taste cells, which leads to the perception of savoriness.
17051
BiochemistryThe biochemical defect in Osteogenesis Imperfecta, type II is a deficiency in lysyl hydroxylase.
97984
PeriodonticsSite-specific characteristics are not seen in herpetic gingivostomatitis.
31397
Oral PathologyOral lesions on the tongue are commonly caused by a deficiency of Niacin (Vitamin B3).
15840
EndodonticsInternal resorption is a condition where the dentin and pulp of a tooth are resorbed internally. It is often a result of chronic inflammation of the pulp. Radiographically, it appears as an enlargement of the pulp space, which can give the tooth a pinkish hue clinically (pink tooth of Mummery). The process involves clastic cells that resorb the dental hard tissues.
36496
Radiology
The wavelength of X-ray photon depends upon kilo voltage.
The wavelength of X-rays is inversely proportional to their energy, and the
energy of X-ray photons is determined by the kilo voltage (kV) used in the X-ray
tube. Higher kV results in higher energy and shorter wavelength photons, which
are more penetrating and are used for imaging denser tissues, while lower kV
results in lower energy and longer wavelength photons, which are less
penetrating and are used for imaging softer tissues. The other factors mentioned
(milli amperage, distance between source and object, and quantity of electrons
in the cathodic stream) affect the intensity of the X-ray beam but not the
wavelength of the photons.