In a class II mesio occlusal inlay gingival bevel is at
**Question:** In a class II mesio occlusal inlay gingival bevel is at
A. mesial
B. distal
C. incisal
D. gingival margin
**Correct Answer:** A. mesial
**Core Concept:**
A class II mesio occlusal inlay is a dental restoration indicated for repairing a carious lesion involving only the occlusal surface of a molar or premolar tooth with the carious lesion extending mesially and distally. To prepare the tooth for this restoration, a gingival bevel is created at the gingival margin to minimize the risk of caries spreading to the adjacent tooth or gingiva.
**Why the Correct Answer is Right:** A gingival bevel is required on the mesial surface of the tooth, as it is the surface that extends mesially (towards the midline) from the occlusal surface. This bevel allows for the removal of the carious tissue, while preserving the healthy tooth structure adjacent to the carious lesion.
**Why Each Wrong Option is Incorrect:**
- Option B (distal) refers to the surface extending distally, which is not required for a mesio occlusal inlay.
- Option C (incisal) refers to the incisal edge of the tooth, which is not relevant to creating a gingival bevel for a mesio occlusal inlay.
- Option D (gingival margin) is correct, but the question specifies the direction of the bevel, which is mesial.
**Why Each Wrong Option is Incorrect:**
- Option A (mesial) is incorrect because the gingival bevel should be directed towards the midline, not towards the tooth's mesial surface. This ensures that the bevel is oriented in a direction that prevents the spread of caries to the adjacent tooth or gingiva.
**Clinical Pearls:** In clinical practice, it is essential to understand the direction of the gingival bevel in relation to the tooth structure when preparing a mesio occlusal inlay. Misunderstanding the direction can lead to inadequate caries removal and increased risk of caries spreading. Always consider the direction towards the midline when preparing a mesio-occlusal inlay to ensure the preservation of healthy tooth structure and minimize the risk of caries spreading.