Predictability of maxillary canine retraction comparing power arm and non-power arm using 24 sets of In-house clear aligner in premolar extraction case: a randomized controlled trial

Eurutairat, Sawitt; Vongtiang, Natnicha; Wonghinkong, Sakda; Manopatanakul, Somchai; Santiwong, Peerapong; Viwattanatipa, Nita

doi:10.1186/s12903-025-05891-w

Table 6 Maxillary canine movement (Pre-treatment to 24 aligners); Comparison of predicted (virtual) and achieved (actual) tooth movements in all directions. Results of paired T-test or Wilcoxon signed-rank test (N = 18)

From: Predictability of maxillary canine retraction comparing power arm and non-power arm using 24 sets of In-house clear aligner in premolar extraction case: a randomized controlled trial

Movement	Virtual Mean ± SD (95%CI)		Actual Mean ± SD (95%CI)		P-value		Difference Mean ± SD (95%CI)		P-value Difference	RMSE
Movement	*VPa*	VC	*APa*	AC	*VPa_APa*	*VC_AC*	*APa-VPa*	*AC-VC*		PA	C
Distalization(mm) = + Mesialization(mm) = -	4.51 ± 0.83 (4.10–4.92)	4.67 ± 0.85^# (4.24–5.09)	4.70 ± 1.10 (4.16–5.24)	4.99 ± 0.92 (4.54–5.45)	0.204	0.033^*	0.19 ± 0.61 (-0.11–0.49)	0.33 ± 0.60 (0.26–0.63)	0.26	0.62	0.67
Extrusion (mm) = + Intrusion (mm) = -	0.70 ± 1.08 (0.16–1.24)	0.65 ± 0.83 (0.24–1.06)	0.47 ± 0.85 (0.04–0.89)	0.39 ± 0.75 (0.02–0.77)	0.124	0.04^*	-0.23 ± 0.61^# (-0.54–0.07)	-0.25 ± 0.48 (-0.49- -0.01)	0.88^#	0.64	0.53
Buccal (mm) = + Lingual (mm) = -	2.05 ± 0.86 (1.63–2.48)	2.09 ± 0.77 (1.71–2.48)	2.11 ± 0.93^# (1.65–2.57)	2.05 ± 0.80 (1.65–2.44)	0.601^#	0.381	0.06 ± 0.29 (-0.09–0.20)	-0.05 ± 0.23 (-0.16–0.06)	0.35	0.29	0.22
Tip (°)
MCT = +	-0.67 ± 5.73	1.80 ± 5.65	-11.10 ± 3.12^#	-8.80 ± 3.97	0.000^#	0.000^*	-10.43 ± 5.37	10.60 ± 4.58	0.91	11.66	11.50
DCT = -	(-3.52–2.18)	(-1.02–4.61)	(-12.65- -9.55)	(-10.78- -6.83)	0.000^#	0.000^*	(-13.10- -7.76)	-(-12.88- -8.32)	0.91	11.66	11.50
Torque (°)
BCT = +	-2.33 ± 4.68	-4.16 ± 4.66	-0.70 ± 4.20	-0.89 ± 3.10	0.236	0.019^*	1.63 ± 5.63	3.28 ± 5.37	0.386	5.71	15.98
LCT = -	(-4.65–0.00)	(-6.48- -1.84)	(-2.78–1.39)	(-2.43–0.66)	0.236	0.019^*	(-1.17–4.43)	(0.61–5.95)	0.386	5.71	15.98
Rotation (°)
M-in = +	-0.51 ± 6.03^#	-6.43 ± 9.70	-4.05 ± 7.28	-18.00 ± 8.62	0.039^#,*	0.000^*	-3.54 ± 7.22	-11.57 ± 11.35^#	0.006^#,*	7.85	15.98
D-in = -	(-3.51–2.49)	(-11.25- -1.61)	(-7.66- -0.43)	(-22.28- -13.71)	0.039^#,*	0.000^*	(-7.12–0.05)	(-17.21- -5.92)	0.006^#,*	7.85	15.98

Abbreviation: VPa power arm side of virtual model, VC control side of virtual model, APa power arm side of actual model, AC control side of actual model, APa-VPa Difference between actual and virtual model on power arm, VC-AC Difference between actual and virtual model on control
Favorable movement = + (Distalization, Extrusion, Buccal, Mesial Crown Tip (MCT), Buccal Crown Torque (BCT), Mesial-in rotation)
Non-Favorable movement =—(Mesialization, Intrusion, Lingual, Distal Crown Tip (DCT), Lingual Crown Torque (LCT), Distal-in rotation)
^#non- parametric
^* Statistically significant at p < 0.05

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