Precision for investing and polymerisation Developed in collaboration with MDT Jürg Stuck, this flask helps to achieve new dimensions in precision-fitting complete dentures. Three Allen screws hold the two halves of the flask together, making the cumbersome flask clamp superfluous. Tapered steel guides centre the flask sections when they are closed and ensure a gap-free fit between the upper and lower halves. When using Aesthetic Intensive Colors (multi-colored packing of the gingiva), compacting can be avoided by means of the asymmetrical closing method.