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Pericoronitis is an inflammation of the soft tissue surrounding the crown of an incompletely erupted tooth, commonly seen around the third molars (wisdom teeth) but can also occur with other teeth. The condition arises when food particles, bacteria, and plaque accumulate around the partially erupted molar, leading to localized infection. Thus, pericoronitis is most commonly associated with teeth that are not fully erupted

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Huntington's disease is characterized by two main clinical features: chorea (involuntary, irregular, and sudden jerky movements) and behavioral disturbances. These symptoms may occur alone or in combination, with the choreic movement disorder typically becoming more pronounced over time.

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Pernicious anemia (vitamin B12 deficiency) is associated with neurological symptoms including peripheral neuropathy, subacute combined degeneration of the spinal cord, and demyelination. Premature graying of hair is also a characteristic feature due to B12s role in melanin synthesis. Folic acid deficiency causes megaloblastic anemia but not neurological symptoms. Plummer-Vinson and Paterson-Kelly syndromes are iron deficiency-related conditions without these specific manifestations.

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A periodontal probe measures the amount of attachment loss.

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For extraction in a leukemic patient, all of the above steps should be taken.

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metronidazole 250 mg po qid for 7 to 10 days is the treatment of choice.

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A severe case of Obstructive Sleep Apnoea (OSA) is classified when the Apnoea-Hypopnoea Index (AHI) exceeds 30 episodes per hour of sleep. The AHI measures the number of apnoea (complete cessation of breathing) and hypopnoea (partial reduction in breathing) events per hour.

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Chronic bronchitis may result in cor pulmonale, increased airway resistance, metaplasia and dysplasia of respiratory epithelium

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