NEET MDS Shorts
87737
ProsthodonticsTitanium alloys are commonly used in dental implants due to their favorable properties, including biocompatibility and mechanical strength. The density of titanium alloys is relatively close to that of human alveolar bone, which helps in achieving a good integration (osseointegration) between the implant and the bone. Other materials listed, such as chromium-cobalt and stainless steel alloys, have different densities and are not as compatible with bone in terms of density and biological response. Bioglass, while biocompatible, is not typically used as a structural implant material in the same way as titanium.
27410
RadiologyWaters view is the best radiograph for viewing fractures of maxillary bone. It provides excellent visualization of the maxillary complex, including the maxillary sinuses, zygomaticomaxillary sutures, and orbital floors, which are commonly involved in maxillary fractures.
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.
24122
AnatomyBranches of Maxillary nerve are 1. Middle meningeal n. 2. zygomatic n. : zygomaticofacial, zygomaticotemporal 3.pterygopatine branches : orbital, post. sup. lat. nasal , medial septal, greater palatine, middle palatine , post. palatine 4. post. sup alveolar 5. Infraorbital middle sup. alveolar anterior sup. alveolar 6. Terminal lat. nasal inf. palpebral sup. labialis
83028
Medicine
Ochronosis, the deposition of homogentisic acid (HGA) in connective tissues, is a characteristic feature of alkaptonuria.
30150
Dental Materials
Addition-type silicone rubber impression materials are characterized by their
very low dimensional change, which means they exhibit minimal shrinkage or
expansion upon setting. This is a highly desirable property in dental
impressions as it ensures that the casts or models produced from these
impressions will be accurate representations of the patient's oral structures. their setting reaction involves the addition of a cross-linking agent to the
base material, which forms a stable polymer without the by-products that can
cause significant dimensional changes
46997
Dental Materials
According to the text, a luting agent must be sufficiently fluid to flow into a continuous film of 25 µm thickness or less without fragmentation.
21318
ProsthodonticsThe main drawback of metallic denture bases in distal extension situations is that they cannot be easily relined when ridge resorption occurs. Metal bases require complex laboratory procedures for relining, unlike resin bases which can be chairside relined. This limitation makes adjustment to tissue changes difficult and expensive.
70518
INI CET
Motilin is the primary hormone regulating Migratory Motor Complexes (MMCs) during the interdigestive state.
31713
Community DentistryCalculus formation is primarily retarded by daily plaque removal through proper oral hygiene practices, as calculus forms from mineralized plaque.