Actions in which pressure stretches or strains the structure are referred to as compressional forces.Tensional forces are actions in which pressure attempts to increase a structure's volume.

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Both statements are false.The definitions are reversed.Actions in which pressure attempts to diminish a structure's volume are referred to as compressional forces (think compression equals making something smaller).Conversely,tensional forces are actions in which the pressure stretches or strain the structure.As with bone,the mineral crystallization structure makes teeth extremely resistant to forces.Collagen fibers also play a major role.

Actions in Which Pressure Stretches or Strains the Structure Are