NEET MDS Shorts
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Physiology
The reticulospinal tract arises from neurons in the reticular formation of the brainstem and projects to the spinal cord. It influences both voluntary and involuntary motor activities, modulating the excitability of motor neurons. The corticospinal tract arises from the cerebral cortex, the vestibulospinal tract from the vestibular nuclei, the rubrospinal tract from the red nucleus, and the tectospinal tract from the superior colliculus.
26051
RadiologyThe extraoral radiograph that best demonstrates the subcondylar portion of the mandible is Towne's view.
84599
EndodonticsThe stabilization of an avulsed tooth typically requires a period of 1-2 weeks. During this time, the tooth is often replanted and stabilized to allow for healing and reattachment of the periodontal ligament.
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INI CET
Sunflower cataracts and Kayser-Fleischer rings are hallmark signs of Wilson’s disease, a genetic disorder leading to copper accumulation. These ocular manifestations are key in diagnosis.
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INI CET
In a growing child with TMJ ankylosis, chondrocostal grafting is preferred as it provides a growth center to maintain ramal height and accommodate mandibular growth.
44417
EndodonticsVertical root fractures have the poorest prognosis among all tooth fractures. This is because: 1) The fracture line extends from crown to apex, compromising the entire root structure, 2) Bacterial contamination occurs along the entire fracture line, 3) Periodontal ligament attachment is severely compromised, 4) Healing is virtually impossible due to constant separation of fragments during function, 5) Almost always requires extraction. Horizontal fractures at the apical third have the best prognosis, while gingival level and middle third fractures have intermediate prognosis depending on management.
50917
Community DentistryThe Simplified Oral Hygiene Index (OHI-S) is a tool used to assess oral hygiene status by evaluating specific tooth surfaces. The teeth mentioned in option 1 include the lingual surfaces of the lower first molars (36, 46) and the facial surfaces of the upper incisors and canines (11, 16, 26, 31). These surfaces are typically assessed because they are representative of overall oral hygiene and are commonly affected by plaque accumulation.
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NEETMDS
High fusing ceramics, such as those used for denture teeth, require a firing temperature above 1300°C to achieve proper vitrification and strength.
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Oral SurgeryStreptomycin is considered a narrow-spectrum antibiotic, primarily effective against Gram-negative bacteria and Mycobacterium tuberculosis. Ampicillin, chloramphenicol, and tetracycline are all classified as broad-spectrum antibiotics because they are effective against a wide range of both Gram-positive and Gram-negative bacteria.
82304
NEETMDSMitochondrial inheritance is characterized by a mother transmitting the disease to all her children because offspring inherit mitochondria exclusively from the mother's egg cell.