The unalloyed form of titanium used to form dental implants is in the
**Core Concept**
The unalloyed form of titanium used in dental implants is a biocompatible material that provides a strong and durable foundation for osseointegration. Titanium's unique properties, such as high strength-to-weight ratio and resistance to corrosion, make it an ideal choice for medical implants. The unalloyed form of titanium is also known as commercially pure titanium (CPT).
**Why the Correct Answer is Right**
The correct answer is titanium grade 4, which is the unalloyed form of titanium used in dental implants. This grade of titanium has a high purity level, typically above 98.5%, and is resistant to corrosion in seawater, which makes it suitable for use in the human body. The high purity level of titanium grade 4 ensures that it does not contain any impurities that could lead to corrosion or toxicity. The osseointegration process, where the titanium implant fuses with the surrounding bone tissue, is facilitated by the biocompatibility and corrosion resistance of titanium grade 4.
**Why Each Wrong Option is Incorrect**
* **Option A:** Titanium grade 2 is not suitable for dental implants due to its lower strength and higher corrosion rate compared to titanium grade 4.
* **Option B:** Titanium grade 5 is an alloy of titanium and aluminum, which is not suitable for dental implants due to its lower corrosion resistance and higher risk of toxicity.
* **Option D:** Titanium grade 7 is an alloy of titanium and molybdenum, which is not commonly used in dental implants due to its higher cost and lower biocompatibility compared to titanium grade 4.
**Clinical Pearl / High-Yield Fact**
When selecting a material for dental implants, it's essential to consider factors such as biocompatibility, corrosion resistance, and mechanical strength. Titanium grade 4 is a popular choice due to its high purity level and resistance to corrosion, making it an ideal material for osseointegration.
**Correct Answer:** C.