Point at which pulp tissue ends and periodontal tissue begins is known as
**Core Concept**
The question is testing the understanding of the anatomical relationship between pulp tissue and periodontal tissue in the tooth. This concept is essential in endodontics and periodontology, as it helps in diagnosing and treating various dental conditions.
**Why the Correct Answer is Right**
The correct answer is the junctional epithelium, which is the point where the epithelial attachment of the gingiva meets the tooth surface. This marks the boundary between the pulp tissue within the tooth and the periodontal tissue surrounding the tooth. The junctional epithelium is a critical structure in maintaining the health of the periodontal attachment and preventing the progression of periodontal disease.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not accurately describe the point at which pulp tissue ends and periodontal tissue begins.
* **Option B:** This option is incorrect as it refers to the cemento-enamel junction, which is the boundary between the enamel and cementum of the tooth, not the pulp and periodontal tissues.
* **Option C:** This option is incorrect as it does not accurately describe the point at which pulp tissue ends and periodontal tissue begins.
**Clinical Pearl / High-Yield Fact**
The junctional epithelium is a non-keratinized, stratified squamous epithelium that forms a seal around the tooth, preventing the invasion of bacteria and other pathogens into the periodontal tissues.
**Correct Answer:** C. Junctional epithelium