The schematic diagram shows appropriate pulp tissue zones following formocresol therapy, except
**Core Concept**
Formocresol therapy is a pulpotomy technique used to treat primary teeth with deep caries, involving the partial removal of infected pulp tissue to preserve the tooth. The treatment aims to remove the infected portion of the pulp while maintaining the vitality of the remaining pulp tissue.
**Why the Correct Answer is Right**
The correct zones following formocresol therapy include the **zone of coagulation** (the area where the formocresol solution causes coagulation of the pulp tissue), the **zone of necrosis** (the area where the formocresol solution causes necrosis of the pulp tissue), and the **zone of remaining vital pulp** (the area where the pulp tissue remains vital and healthy). The formocresol solution should not penetrate beyond the **cementodentinal junction**, preserving the vitality of the remaining pulp tissue.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a recognized zone following formocresol therapy. The zones mentioned earlier are the only recognized categories.
**Option B:** This option is incorrect because the **zone of inflammation** is not a recognized zone following formocresol therapy. The formocresol solution is designed to cause coagulation and necrosis, not inflammation.
**Option C:** This option is incorrect because the **zone of resorption** is not a recognized zone following formocresol therapy. While resorption can occur in response to pulp necrosis, it is not a direct result of formocresol therapy.
**Clinical Pearl / High-Yield Fact**
A key consideration when performing formocresol therapy is to avoid penetration of the formocresol solution beyond the cementodentinal junction, as this can lead to over-irritation and potential damage to the remaining pulp tissue.
**Correct Answer: C.**