**Question:** Endo sealer containing polyketone is

A. AH Plus
B. EndoREZ
C. EndoSeal M2
D. TubliSeal

**Correct Answer:** A. AH Plus

**Core Concept:** Endodontic sealers are materials used to fill the root canal system after shaping and cleaning the root canal during root canal treatment. These sealers help to prevent bacterial leakage and maintain the integrity of the root canal filling.

**Why the Correct Answer is Right:** AH Plus (epoxy resin-based sealer) is a popular choice due to its excellent sealing ability, adaptation to root canal walls, and resistance to root canal bacteria. It is known for its excellent adaptation to the dentin walls, forming a hermetic seal that reduces the risk of bacterial leakage and reinforces the root canal filling.

**Why Each Wrong Option is Incorrect:**

B. EndoREZ (polymerization shrinkage) is a concern with this sealer option, leading to marginal gaps and compromised sealing ability.

C. EndoSeal M2 (hybrid sealer) is not as widely used as AH Plus and may have differences in sealing ability and adaptation.

D. TubliSeal (zinc oxide eugenol-based sealer) is an outdated sealer option that was previously used in root canal treatment but is now largely replaced by more modern sealer options like AH Plus.

**Why Option D is Incorrect:** TubliSeal is a zinc oxide eugenol-based sealer, which has been replaced by newer materials like epoxy resin-based sealers like AH Plus due to its inferior sealing ability, adaptation, and increased risk of root canal infections.

**Clinical Pearls:**

**Core Concept:** Choosing the appropriate endodontic sealer is crucial for successful root canal treatment. AH Plus is a reliable option due to its excellent sealing ability, adaptation to root canal walls, and resistance to root canal bacteria.

**Why Option A is Right:** AH Plus is widely used and has proven effectiveness in reducing bacterial leakage and maintaining the integrity of the root canal filling.

**Clinical Pearls:** When selecting an endodontic sealer, consider factors such as sealing ability, adaptation, biocompatibility, and resistance to bacterial leakage. AH Plus satisfies these criteria, making it a popular choice for root canal treatment.