Obturation of a root canal should achieve
**Core Concept**
The goal of obturation in root canal therapy is to create a hermetic seal of the canal space to prevent bacterial re-infection and ensure the long-term success of the treatment. This involves filling the canal with a material that can adapt to the canal's irregularities and provide a tight seal.
**Why the Correct Answer is Right**
Obturation should achieve **apical seal**, which refers to the tight seal between the obturation material and the apical foramen. This is critical to prevent bacteria from entering the canal and causing reinfection. The apical seal is achieved through the use of a suitable obturation material, such as gutta-percha, and proper technique, including the use of a well-adapted master cone and a well-condensed filling material.
**Why Each Wrong Option is Incorrect**
**Option A:** **Aseptic containment** is not the primary goal of obturation, although it is an important consideration in preventing bacterial contamination during the treatment process.
**Option B:** **Anatomical adaptation** is a desirable outcome of obturation, but it is not the primary goal of the procedure.
**Option C:** **Biomechanical debridement** is an important step in root canal therapy, but it is not the goal of obturation.
**Clinical Pearl / High-Yield Fact**
To achieve a hermetic seal, the obturation material should be condensed to a density of at least 0.8 g/cm3, and the apical foramen should be sealed with a well-adapted master cone.
**Correct Answer: A. Apical seal**