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Table 1 Maximum tensions on the skin areas

From: Stress on facial skin of class III subjects during maxillary protraction: a finite element analysis

Mask type Max. tension on chin skin surface Max. tension on forehead skin surface
Delaire 29 kPa 6 kPa
Petit 44 kPa 3 kPa
  1. kPa, kilopascal. 1 kPa correspond to 1000 Pa