In periodontal disease, ground substance is dissolved by
**Core Concept**
Periodontal disease involves the breakdown of the periodontium, a group of structures that support the teeth, including the gingiva, periodontal ligament, cementum, and alveolar bone. Ground substance is a component of the extracellular matrix found in connective tissue, and its degradation plays a crucial role in the progression of periodontal disease.
**Why the Correct Answer is Right**
The correct answer involves the enzyme responsible for breaking down ground substance. In periodontal disease, ground substance is dissolved by the enzyme hyaluronidase, which cleaves the hyaluronic acid molecules that make up a significant portion of the ground substance. This degradation leads to the loss of tissue structure and function, contributing to the progression of periodontal disease. The action of hyaluronidase is a key factor in the breakdown of the extracellular matrix, allowing bacteria and inflammatory cells to invade the periodontal tissues.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely incorrect because it is not directly related to the breakdown of ground substance in periodontal disease. However, without more information, it is difficult to provide a specific reason why this option is incorrect.
**Option B:** This option is incorrect because it is not a specific enzyme known to dissolve ground substance. While certain enzymes may play a role in the degradation of various components of the extracellular matrix, they are not directly responsible for breaking down ground substance in periodontal disease.
**Option C:** This option is incorrect because it is not a relevant enzyme in the context of ground substance degradation. The correct enzyme, hyaluronidase, is responsible for breaking down hyaluronic acid, a key component of ground substance.
**Clinical Pearl / High-Yield Fact**
In periodontal disease, the degradation of ground substance by hyaluronidase allows bacteria and inflammatory cells to invade the periodontal tissues, contributing to the progression of the disease. This process highlights the importance of maintaining a healthy extracellular matrix in the prevention and treatment of periodontal disease.
**Correct Answer:** C. Hyaluronidase.