Fig. 2.

The stress distributions of the lower anterior teeth under three different periodontal conditions with axial inclination 90°. a The stress distributions of the lower anterior teeth under normal periodontal condition with axial inclination 90°. b The stress distributions of the lower anterior teeth under mild periodontal disease with axial inclination 90°. c The stress distributions of the lower anterior teeth under moderate periodontal disease with axial inclination 90°. 1: 0.10 mm displacement; 2: 0.15 mm displacement; 3: 0.18 mm displacement; 4: 0.20 mm displacement; 5: 0.25 mm displacement