**Core Concept**
Injection molded ceramic refers to a manufacturing technique used to produce ceramic components with complex geometries. This method combines the benefits of ceramic materials, such as high temperature resistance and biocompatibility, with the precision and speed of injection molding. The resulting ceramic parts can be used in various fields, including dentistry, orthopedics, and biomedical engineering.

**Why the Correct Answer is Right**
The process of injection molded ceramic involves mixing ceramic powder with a binder, which is then injected into a mold using an injection molding machine. The ceramic material is then sintered at high temperatures to remove the binder and achieve the desired shape and properties. This technique allows for the production of complex ceramic components with high accuracy and surface finish. The use of ceramic materials in injection molding takes advantage of their excellent mechanical properties, such as high strength and toughness, as well as their resistance to corrosion and wear.

**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because it does not describe a recognized manufacturing technique for ceramic components.
**Option B:** This is incorrect because it refers to a different material processing method that is not related to ceramic injection molding.
**Option C:** This is incorrect because it describes a different type of ceramic manufacturing process that involves shaping and firing ceramic powders.

**Clinical Pearl / High-Yield Fact**
In the context of biomedical applications, injection molded ceramic is often used to produce custom-fit implants, such as dental crowns and orthopedic implants, which can be tailored to individual patient needs. This technique combines the precision of injection molding with the biocompatibility and durability of ceramic materials.

**Correct Answer: D. Alumina (Al2O3) is often used in injection molded ceramic due to its excellent mechanical properties and biocompatibility.**