NEET MDS Shorts
89212
Conservative Dentistry
The direction of the force is the most critical factor for the adaptation of gold foil to cavity walls because the force must be directed at a \(45^{\circ }\) angle to the cavity wall to ensure proper condensation and a tight seal.
19389
State PSC PYQNewly erupted enamel is highly susceptible to caries. Applying fluoride varnish immediately after tooth eruption strengthens enamel during the maturation phase.
12475
General PathologyThe primary mechanism of tissue damage in a tuberculin reaction is the activation of macrophages by CD4+ memory T cells.
56556
Dental Materials
ZnO is a filler in Gutta Percha, and it improves the strength and flexibility of the material.
97629
PeriodonticsThe type of suture recommended for an apically displaced flap adjacent to an edentulous area is an anchor suture.
47842
RadiologyAccording to Clark's rule for localization of an object, if the tube is shifted mesially to the original angulation, the lingual object moves mesially.
72264
Oral SurgerySerum sickness is a type III hypersensitivity reaction that typically occurs 7 to 21 days (1 to 3 weeks) after initial exposure to the offending antigen, which is the time required for the immune system to produce antibodies that form immune complexes with the antigen.
89084
ProsthodonticsFovea palatine are situated in the soft palate.
24780
Oral Surgery
Local anaesthetics act by blocking voltage‑gated sodium
channels, preventing depolarization and conduction of nerve impulses.
The sensitivity of different nerve fibres depends on their diameter,
myelination, and conduction velocity. Type B fibres Small, myelinated preganglionic autonomic fibres. Moderately sensitive to local anaesthetics. Type C fibres Smallest, unmyelinated fibres. Carry dull, aching pain and temperature sensations. Most sensitive to local anaesthetics because
of their small diameter and lack of myelin. Type A‑delta fibres Small, thinly myelinated fibres. Carry sharp, pricking pain. Less sensitive than Type C fibres but more sensitive than
larger A‑alpha fibres. Fibres supplying muscle spindles (Type A‑alpha fibres) Large, heavily myelinated fibres. Conduct proprioception and motor signals. Least sensitive to local anaesthetics due to
their large diameter and thick myelin sheath. Local anaesthetics preferentially block small,
unmyelinated fibres first (Type C), followed by small myelinated fibres
(Type B, A‑delta). Large myelinated fibres (A‑alpha) are blocked last. This
explains why pain sensation is lost before motor function during local
anaesthesia.
94289
Oral SurgeryThe most suitable anaesthesia for the extraction of a deciduous molar is inferior alveolar nerve block.