Table 4.

Relative incisor extrusion in different groups

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

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