**Question:** Which of the following is not an advantage of supragingival margin?

A. Prevention of supragingival calculus formation
B. Facilitation of supragingival plaque accumulation
C. Improved accessibility for oral hygiene procedures
D. Influence on gingival health and aesthetics

**Core Concept:** Advantages of supragingival margin in dentistry include preventing supragingival calculus formation, improving accessibility for oral hygiene procedures, and contributing to better gingival health and aesthetics.

**Why the Correct Answer is Right:**

Option B ("Facilitation of supragingival plaque accumulation") is the correct answer because supragingival margins are designed to elevate the gingival margin above the cementoenamel junction, promoting supragingival plaque accumulation and leading to periodontal problems.

**Why Each Wrong Option is Incorrect:**

Option A ("Prevention of supragingival calculus formation") seems appealing but supragingival margins encourage supragingival plaque accumulation, which can lead to calculus formation.

Option C ("Improved accessibility for oral hygiene procedures") is incorrect because supragingival margins can hinder oral hygiene procedures due to the elevated gingival margin.

Option D ("Influence on gingival health and aesthetics") is also incorrect as supragingival margins can negatively impact both gingival health and aesthetics due to their design, which promotes supragingival plaque accumulation and elevates the gingival margin.

**Clinical Pearl:** While supragingival margins are frequently used to improve esthetics, they can lead to periodontal problems if not designed appropriately. Optimal supragingival margin design should aim for a level gingival margin or a very shallow supragingival elevation to prevent plaque accumulation and periodontal issues.

**Correct Answer:** D