Provide at least 1.5mm of space in the cusp areas. Partial crowns are indicated if the preperation margin is less than approx 0.5mm away from the cusp tip, or if the enamel is severly undermined

Prepareacircular shoulder with rounded inner edges or chamfer with an angle of approx 20-30°. The width of the shoulder/chamfer is approx 1mm.

If possible, the preparation should be entirely located in the enamel. The incisal preparation margins should not be located in the area of the abrasion surfaces or dynamic occlusal surfaces

By preparing orientation grooves using a depth marker, controlled enamel reduction can be achieved. Opening of the proximal contacts is not required

Preparation without involving of the incisal edges (only labial reduction): The preperation depth in the labial area should be at least 0.6mm

Preparation reduction of the incisal edge (labial / incisal reduction): The preperation depth in the cervical and labial area should be at least 0.6mm. The incisal edge must be reduced by 0.7mm. The more transparent the incisal edge of the intended veneer, the more pronounced the reduction should be.