Effects of Variable Composite Attachment Shapes in Controlling Upper Molar Distalization with Aligners: A Nonlinear Finite Element Study

Figure 5

Maximum principal stress in the first maxillary molar periodontal ligament during 0.15 mm distalization for the three groups: (a) without attachment, (b) with rectangular vertical attachment, and (c) with guideline attachment.

(a)

(b)

(c)