**Core Concept**
The reverse three quarter crown restoration is a type of dental restoration used to restore teeth with significant loss of structure, particularly on the facial surface. It is characterized by a three-quarter crown design that covers the facial surface and a portion of the interproximal surfaces.

**Why the Correct Answer is Right**
The reverse three quarter crown with complete coverage of the facial surface is used for teeth that require a high level of aesthetic and functional restoration. This type of restoration is often used for anterior teeth where aesthetics is a major concern. The complete coverage of the facial surface provides a strong and durable restoration that can withstand the forces of mastication and also provides a good aesthetic outcome.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because a full crown would provide complete coverage of the tooth, but it may not be necessary for all cases where a reverse three quarter crown is indicated.
**Option B:** This option is incorrect because a onlay would provide partial coverage of the tooth and may not provide the same level of aesthetic and functional restoration as a reverse three quarter crown.
**Option C:** This option is incorrect because a three quarter crown with partial coverage of the facial surface may not provide the same level of aesthetic and functional restoration as a reverse three quarter crown with complete coverage.

**Clinical Pearl / High-Yield Fact**
A reverse three quarter crown can be used to restore teeth with significant loss of structure, particularly on the facial surface, and provides a good aesthetic and functional outcome.

**Correct Answer: C.**