Which type of retraction involves mechanical devices such as cord or hemodent paste?

Mechanical retraction refers to the use of physical devices or tools to push back soft tissue, specifically gum tissue, in order to provide better visibility and access for dental procedures. This method typically employs materials such as retraction cords or hemodent paste, which help to separate the gingiva from the tooth structure during procedures like crown placement or restorative work.

These mechanical devices work by physically holding back the gingival margins, which is crucial for the dentist to achieve a clean and accurate working area. They can also facilitate improved impressions and better seating of crowns or other restorations.

This method differs from chemical retraction, where substances are used to chemically induce tissue retraction, often by causing blood vessel constriction. Surgical retraction usually involves more invasive techniques, such as incisional procedures that alter the soft tissue structure. Passive retraction is generally less effective in providing the necessary space and visibility, relying on the natural position of the tissues without active intervention. Understanding the use and importance of mechanical retraction is vital for dental assistants to ensure optimal outcomes in dental procedures.