What are the requirements of a pontic:
**Core Concept**
A pontic is a prosthetic tooth replacement in a fixed dental prosthesis, such as a bridge. The design and requirements of a pontic aim to restore both function and aesthetics in the oral cavity. The pontic must be carefully planned to ensure optimal distribution of forces, prevent tissue irritation, and maintain oral hygiene.
**Why the Correct Answer is Right**
The correct answer is related to the biological width, which is the distance between the gingival margin and the alveolar bone crest. The pontic should not encroach upon the biological width to prevent irritation of the gingiva and maintain periodontal health. The pontic should be designed to be at least 2 mm away from the gingival margin to accommodate the biological width.
**Why Each Wrong Option is Incorrect**
**Option A:** The pontic should not be bulky or have an excessive height, as this can cause food entrapment and irritation of the gingiva.
**Option B:** While the pontic should be aesthetically pleasing, it is not the primary requirement. Function and periodontal health are equally important considerations.
**Option C:** The pontic should not be too close to the gingival margin, as this can lead to irritation and inflammation of the gingiva.
**Clinical Pearl / High-Yield Fact**
It is essential to maintain a minimum of 2 mm between the pontic and the gingival margin to ensure a healthy biological width and prevent tissue irritation.
**Correct Answer:** D.