The role of sodium metabisulfite in local anaesthetic agent is as a preservative.

Inferior alveolar nerve block is given in the pterygomandibular space.

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

Early movements of TMJ following surgery for TMJ ankylosis is desirable.

A tracheostomy is a surgical procedure that involves creating an opening in the trachea (windpipe) to facilitate breathing. The preferred site for making the incision during a tracheostomy is the cricothyroid ligament, which is located between the cricoid and thyroid cartilages.

• Cricothyroid ligament: This ligament is relatively superficial and provides a safe access point to the airway, especially in emergency situations. It is often chosen for emergency tracheostomy because it is easier to locate and access quickly.

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