**Core Concept**
A refiner is a small, adjustable component used in the final stages of denture fabrication to enhance the fit and occlusion of a complete denture. The refiner is crucial for achieving precise occlusal relationships between the upper and lower teeth. However, its use is not without limitations, and there are specific situations where it is contraindicated.

**Why the Correct Answer is Right**
A refiner is contraindicated when there is an existing occlusal scheme or a well-established occlusal relationship that cannot be altered without compromising the denture's stability or the patient's occlusal function. This typically occurs in cases where the patient has a well-established occlusal centric relation, or when significant occlusal changes could jeopardize the denture's retention or stability.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not directly related to the contraindications of a refiner. However, it's essential to note that a refiner is not used for adjusting the vertical dimension of occlusion.
* **Option B:** A refiner is not contraindicated in cases where the patient has a history of temporomandibular joint (TMJ) disorders. In fact, a refiner can be used to adjust the occlusal scheme and alleviate TMJ symptoms in some cases.
* **Option C:** This option is not a contraindication for the use of a refiner. A refiner can be used to adjust the occlusal scheme and achieve a more harmonious occlusal relationship in cases where the patient has a high or low occlusal plane.

**Clinical Pearl / High-Yield Fact**
When using a refiner, it's essential to remember that small adjustments can significantly impact the denture's occlusal relationship. Therefore, it's crucial to work in small increments and evaluate the patient's occlusal function regularly to avoid compromising the denture's stability or the patient's occlusal function.

**Correct Answer:**
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