Dental OSCE (Objective Structured Clinical Examination) Practice Exam

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What is the main component of gutta percha?

Rubber
Zinc oxide
Calcium hydroxide
Paraformaldehyde

The correct answer is: Zinc oxide

Gutta percha is primarily composed of a natural polymer that is derived from the sap of certain tropical trees. The main component that is utilized in endodontics to create a root filling material is not rubber or the other options listed. Instead, it contains a combination of gutta percha itself (the polymer) and is often used in conjunction with other materials. Among these materials, zinc oxide is a significant filler and agent used alongside gutta percha to enhance its properties, such as radiopacity and sealing ability. Zinc oxide is included in gutta percha formulations because it provides beneficial effects, such as promoting biocompatibility and aiding in the sealing of the root canal system. This helps to prevent reinfection and supports the overall outcomes of endodontic treatments.