## **Core Concept**
Titanium alloys are widely used in dental and medical applications due to their **high strength-to-weight ratio**, **corrosion resistance**, and **biocompatibility**. These properties make them ideal for implants and prosthetic devices.

## **Why the Correct Answer is Right**
The correct answer, **Ti-6Al-4V (TC4)**, is the most commonly used titanium alloy in dental and medical fields. This alloy contains 6% aluminum and 4% vanadium, which enhances its mechanical properties and corrosion resistance. **Ti-6Al-4V** is favored for its excellent balance of strength, toughness, and biocompatibility, making it suitable for manufacturing dental implants, orthopedic implants, and surgical instruments.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Although some titanium alloys contain molybdenum, zirconium, and other elements, **Ti-6Al-4V** remains the most widely used.
- **Option B:** This option might refer to a different alloy or composition but is not the most commonly used for dental and medical purposes.
- **Option D:** Pure titanium (CP-Ti) has excellent biocompatibility but lower mechanical strength compared to **Ti-6Al-4V**, making it less suitable for load-bearing applications.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **Ti-6Al-4V** is not only used in dental and orthopedic implants but also in aerospace and industrial applications due to its unique properties. Its biocompatibility and durability make it an excellent choice for permanent implants.

## **Correct Answer:** . Ti-6Al-4V