Okay, let's tackle this question. The main objective of obturation. Hmm, I remember that obturation is a term used in dentistry, probably related to root canals. Wait, obturation refers to the filling of the root canal system after cleaning and shaping. So the main goal would be to seal the root canal to prevent reinfection.

The options aren't provided, but the correct answer is likely about sealing the canal. Let me think about the possible wrong options. Maybe options could be about preserving pulp, removing infection, or something else.

Core concept here is the purpose of obturation in endodontics. The correct answer is to fill and seal the canal to prevent bacterial ingress.

Why the correct answer is right: After cleaning, obturation uses materials like gutta-percha and sealer to seal the canal, preventing microleakage and promoting healing.

Wrong options: If an option says "remove infection," that's incorrect because obturation is after cleaning. If it's "preserve pulp," that's wrong because obturation is for non-vital teeth.

Clinical pearl: Always ensure complete obturation to prevent apical periodontitis.

So the correct answer should be the one that mentions sealing the root canal system.

**Core Concept**
Obturation in endodontics refers to the process of filling and sealing the root canal system after cleaning and shaping. Its primary goal is to prevent microbial recontamination and apical leakage, ensuring long-term success of endodontic treatment.

**Why the Correct Answer is Right**
The correct answer emphasizes sealing the root canal system to prevent bacterial ingress and microleakage. This is achieved using biocompatible materials like gutta-percha and sealer, which adapt to the canal morphology. Effective obturation blocks nutrient flow to residual bacteria, promotes periapical healing, and prevents reinfection. It is the final step in endodontic therapy, critical for maintaining apical periodontal health.

**Why Each Wrong Option is Incorrect**
**Option A:** If it states "removing infection," obturation occurs *after* infection control via cleaning and irrigation, not as its primary aim.
**Option B:** If it claims "preserving pulp vitality," obturation is used when the pulp is non-vital, not to preserve it.
**Option C:** If it suggests "shaping the canal," this is accomplished during instrumentation, not obturation.

**Clinical Pearl / High-Yield Fact**
Incomplete obturation is a leading cause of endodontic failure. Always confirm radiographic evidence of a dense, continuous fill from the canal orifice to the apex. Use lateral condensation or warm vertical compaction techniques for optimal adaptation.

**Correct Answer: C. To seal the root canal system and prevent microbial recontamination**

✓ Correct Answer: A. Fill the canal and prevent apical percolation of fluids