In endodontics, what is the primary purpose of gutta-percha?

• A. To seal the root canal system and prevent reinfection.
• B. To whiten the tooth.
• C. To fill an exterior cavity.
• D. To restore occlusion.

Answer: (A)

In endodontics, the goal after cleaning and shaping is to seal the root canal system to prevent reinfection. Gutta-percha serves this purpose because it is a biocompatible, dimensionally stable material that can fill the entire canal space. When used with a root canal sealer, gutta-percha adapts to irregularities in the dentinal walls and creates a fluid-tight barrier that blocks bacterial leakage from the oral environment or periapical tissues. Its radiopaque nature allows clinicians to verify the fill on radiographs. Techniques such as lateral condensation or warm vertical compaction are used to achieve a dense obturation with gutta-percha. It is not used to whiten the tooth, fill an exterior cavity, or restore occlusion; those functions are addressed by other materials and procedures.