Table 2.

Relationship between resorption of protrusion and treatment effect

Resorption rate	Cases	Treatment effect* (cases)				Excellent and good rate (%)
		Excellent	Good	Fair	Poor
Obvious resorption (≥50%)	20	18	2	0	0	100
Partial resorption (20%–50%)	22	8	13	1	0	95.45
Essentially unchanged (−20% to 20%)	38	8	19	11	0	44.73
Increase (≤−20%)	3	1	0	2	0	33.33

*Treatment effect 2 years after initiating treatment.