## **Core Concept**
The question describes a scenario where a patient has oval-shaped radiolucent areas in the root canals of her maxillary central incisors. This presentation is suggestive of **dens invaginatus**, a developmental anomaly where there is an infolding of the enamel organ during tooth formation, leading to an invagination that can be evident on radiographs as a radiolucent area within the tooth.

## **Why the Correct Answer is Right**
The correct approach to obturating a canal with dens invaginatus, especially when the tooth is asymptomatic but shows a feeble response to vitality tests, involves ensuring thorough cleaning and shaping of the canal, including the invaginated part, to prevent bacterial growth and potential infection. **Option C** likely represents a technique or material suitable for obturating such complex canal anatomy. In cases of dens invaginatus, the use of materials that can adapt well to irregular canal shapes and potentially seal off the invaginated area is crucial. Obturation techniques might involve **thermoplasticized gutta-percha** or other materials that can fill complex canal systems effectively.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option might represent a standard obturation technique that does not adequately address the complexities of dens invaginatus, such as not properly sealing the invaginated area.
- **Option B:** Similarly, this might not account for the specific anatomy of dens invaginatus, potentially leading to inadequate obturation.
- **Option D:** This option could represent a method that is not suitable for the anatomy described, such as not being able to fill the oval-shaped radiolucent areas effectively.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that dens invaginatus can be a source of endodontic treatment challenges due to its complex anatomy. Pre-operative radiographs and sometimes CBCT scans are essential for diagnosis. The clinical challenge lies in thoroughly cleaning and obturating such teeth to prevent future complications.

## **Correct Answer:** .