Table 2.

Greatest maximum and smallest minimum principal stresses (MPa) on the miniscrew surface when the miniscrew was placed vertically or obliquely in each cortical bone thickness.

Cortical bone thickness	Insertion direction		Loading direction
			Upward	Downward	Left-side	Right-side
Type A miniscrew
1.5	Vertical	Maximum	46.2	47.7	44.3	46.1
		Minimum	− 54.4	− 52.4	− 50.4	− 58.9
	Oblique	Maximum	35.7	41.1	45.7	48.2
		Minimum	− 38.4	− 51.3	− 58.7	− 57.4
2.0	Vertical	Maximum	45.3	46.7	43.2	47.0
		Minimum	− 55.8	− 51.7	− 52.2	− 55.6
	Oblique	Maximum	35.7	42.3	44.6	47.2
		Minimum	− 38.8	− 51.6	− 60.5	− 60.0
3.0	Vertical	Maximum	46.3	47.0	44.5	47.0
		Minimum	− 55.4	− 53.1	− 54.1	− 58.7
	Oblique	Maximum	35.4	40.1	44.3	45.4
		Minimum	− 39.0	− 51.5	− 53.8	− 56.3
Type B miniscrew
1.5	Vertical	Maximum	35.1	35.7	35.2	33.9
		Minimum	− 56.7	− 43.0	− 48.7	− 48.6
	Oblique	Maximum	25.8	39.0	34.2	35.5
		Minimum	− 38.2	− 54.7	− 49.7	− 45.3
2.0	Vertical	Maximum	37.1	33.5	35.4	36.1
		Minimum	− 52.0	− 49.3	− 52.9	− 48.7
	Oblique	Maximum	24.3	41.6	32.3	32.2
		Minimum	− 26.3	− 50.3	− 55.8	− 59.9
3.0	Vertical	Maximum	34.7	31.2	33.9	34.3
		Minimum	− 45.0	− 45.1	− 54.8	− 45.8
	Oblique	Maximum	24.6	33.2	31.9	31.4
		Minimum	− 28.6	− 51.6	− 45.4	− 48.9