**Question:** Most recent form of MTA used as an intracanal irrigant?

A. Pulpdent
B. EndoREZ
C. EndoSequence BC Sealer
D. ProRoot MTA

**Correct Answer:** D. ProRoot MTA

**Core Concept:** MTA (Mineral Trioxide Aggregate) is a biocompatible material used in endodontics as an intracanal medicament, sealer, and as a pulp capping material. MTA forms a mineralized barrier, prevents bacteria penetration, and promotes healing of the dental pulp.

**Why the Correct Answer is Right:** ProRoot MTA (Dentsply Tulsa Dental Specialties) is a popular, modern formulation of MTA. It has a better handling and setting time compared to other MTA brands, making it more suitable for clinical use. ProRoot MTA has high radiopacity, which is essential for radiographic assessment during endodontic treatment.

**Why Each Wrong Option is Incorrect:**

A. Pulpdent (MTA Fillapex): It is an MTA-based product, but it lacks the advantages of ProRoot MTA, such as better handling and setting time, higher radiopacity, and wider availability.
B. EndoREZ (Ultradent): EndoREZ is a root canal sealer based on epoxy resin, not MTA. It has different properties and is not suitable for the same purposes as ProRoot MTA.
C. EndoSequence BC Sealer (Septodont): EndoSequence BC Sealer is an epoxy resin-based sealer, not an MTA formulation. It lacks the benefits of ProRoot MTA.

**Clinical Pearl:** Choose ProRoot MTA or other MTA-based products (e.g., Pulpdent) when considering an intracanal medicament or sealer in endodontic procedures. Always consider factors like handling, setting time, radiopacity, and availability when selecting a medicament or sealer.