What is the minimum occlusal reduction for a crown preparation on an anterior incisor?

• A. 1.0mm
• B. 1.5mm
• C. 2.0mm
• D. 2.5mm

Answer: (C)

The minimum occlusal reduction for a crown preparation on an anterior incisor is typically 2.0 mm. This reduction is essential to provide adequate space for the crown material, which ensures both the strength and aesthetic appearance of the restoration.

When preparing an anterior incisor, sufficient material thickness is necessary to minimize the risk of fracture and wear, while also allowing for proper contour and anatomy to match surrounding teeth. At 2.0 mm of occlusal reduction, there is enough space to accommodate various crown materials, such as porcelain fused to metal or all-ceramic options, ensuring an optimal balance between strength and esthetics.

This level of reduction also helps in achieving proper emergence profile and helps with the gingival health by preventing over-contoured restorations that can lead to plaque accumulation. Proper occlusal reduction is crucial for longevity and functional success of the crown, making it a fundamental aspect of restorative dentistry.