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NEET MDS Shorts

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INI CET

Palatography is a technique used in phonetics and clinical assessment to study the articulation of speech sounds by recording tongue contact with the hard palate and teeth.

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Radiology

Selection of kilovoltage for dental films depends on the density of tissues radiographed.

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Conservative Dentistry

For class V composite restoration, the best method to retract gingiva is by using a rubber dam. This provides isolation, visualization, and moisture control, which are crucial for successful adhesive techniques. While other methods like retraction cords or electrosurgery may be used in some cases, they are not the most suitable for routine class V restorations.

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Dental Anatomy

In an average child the mixed dentition period is from 6 yrs to 13 y

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NEETMDS

The center of rotation (COR) is the point around which a body rotates when a force is applied.For pure intrusion (bodily movement along the tooth/s long axis with no tipping), the center of rotation is located at infinity.This means the entire tooth moves vertically without any angular change.

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Dental Materials

Temporary restorative materials should have low compressive strength (less than 35 MP1) and good marginal sealing to facilitate easy removal and minimize thermal microleakage.

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General Microbiology

The primary mechanism of action of the PCR test in diagnosing HIV infection is the amplification of viral RNA or DNA, allowing for the detection of the virus.

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INI CET

The numbers 1-2 are part of the standard Gracey series for anterior teeth, but in many clinical contexts focused on posterior teeth, 11-12 (buccal/lingual) and 13-14 or 16-17 (distal) are emphasized. However, strictly speaking, 1-2 is a Gracey. Given the key, the distinction is often made based on standard kits.

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Orthodontics

Pterygoid muscle response to the activator is typically evaluated after 6-8 weeks of wear to assess adaptation and growth stimulation.

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Oral Surgery

Gate Control Theory (Melzack and Wall, 1965): Pain signals from small fibres (A‑delta and C fibres) travel to the dorsal horn of the spinal cord. These signals can be modulated by input from larger fibres.

A‑delta fibres: Small, thinly myelinated fibres that transmit sharp, pricking pain. They tend to open the gate (facilitate pain transmission).

C fibres: Small, unmyelinated fibres that transmit dull, aching pain. They also open the gate.

Large diameter A‑beta fibres: Myelinated fibres that carry touch, pressure, and vibration sensations. Their activation stimulates inhibitory interneurons in the dorsal horn, which close the gate and reduce pain transmission. This explains why rubbing or massaging an injured area can lessen pain.

B fibres: Preganglionic autonomic fibres, not directly involved in pain gate modulation.

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