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Progress in Orthodontics

Table 4 Relative incisor extrusion in different groups

From: Different biomechanical effects of clear aligners in bimaxillary space closure under two strong anchorages: finite element analysis

Group

Relative to the second premolars (× 10−2 mm)

Relative to the first molars (× 10−2 mm)

Moderate anchorage group (maxilla)

1.699E

1.548E

Moderate anchorage group (mandible)

2.062E

1.800E

Indirect anchorage group (maxilla)

2.074E

1.696E

Indirect anchorage group (mandible)

2.390E

1.882E

Direct anchorage group (maxilla)

1.679E

1.550E

Direct anchorage group (mandible)

1.910E

1.703E

  1. The values indicate the relative incisor extrusion of teeth (× 10−2 mm); E, tooth extrusion based on the occlusal plane; the relative incisor extrusion is calculated based on the displacement differences between the central incisors and posterior teeth (the second premolar and the first molar) in the vertical direction
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