The effect of post-ultraviolet light curing on the accuracy of direct-printed aligners: an in vitro study

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Comparison of composite deviation between the groups for first observer (N = 30)

Landmark	No cure	40 min cure	60 min cure	p-value*
R1	-0.48 (0.65)	-0.16 (0.33)	-0.03 (0.16)	0.074
L1	-0.46 (0.67)	-0.19 (0.21)	-0.11 (0.13)	0.170
R3	-0.18 (0.36)	-0.14 (0.1)	-0.13 (0.13)	0.858
L3	-0.25 (0.54)	-0.03 (0.1)	-0.04 (0.22)	0.310
R6	-0.66 (0.54)	-0.13 (0.05)	-0.15 (0.17)	0.001**
L6	-0.21 (0.8)	-0.05 (0.17)	-0.03 (0.13)	0.665
FR1	-0.08 (0.4)	0.07 (0.13)	0.12 (0.07)	0.159
FL1	-0.11 (0.32)	0.15 (0.03)	0.18 (0.05)	0.002**
R7	-0.38 (0.52)	-0.09 (0.13)	-0.09 (0.18)	0.091
L7	-0.73 (0.74)	-0.13 (0.08)	-0.02 (0.12)	0.003**

Intra-class correlation coefficient between the two observers across the three groups (N = 30)

Group	Landmark	Intra-class correlation coefficient (95% CI)	Percentage with <0.10 mm difference	p-value
No cure	R1	0.265 (-0.401–0.748)	50%	0.215
	L1	-0.121 (-0.674–0.519)	50%	0.639
	R3	0.671 (0.115–0.906)	90%	0.012
	L3	0.953 (0.821–0.987)	90%	<0.001
	R6	0.742 (0.253–0.929)	90%	0.004
	L6	0.491 (-0.157–0.843)	50%	0.062
	FR1	0.518 (-0.122–0.853)	70%	0.051
	FL1	0.079 (-0.549–0.65)	80%	0.409
	R7	0.958 (0.841–0.989)	70%	<0.001
	L7	0.755 (0.28–0.932)	80%	0.004
40 min cure	R1	0.045 (-0.573–0.630)	70%	0.448
	L1	0.454 (-0.204–0.829)	80%	0.080
	R3	0.802 (0.385–0.946)	80%	0.002
	L3	0.327 (-0.342–0.776)	90%	0.163
	R6	0.445 (-0.214–0.825)	80%	0.085
	L6	0.688 (0.147–0.912)	90%	0.010
	FR1	0.821 (0.432–0.952)	100%	0.001
	FL1	0.393 (-0.274–0.804)	90%	0.116
	R7	0.926 (0.732–0.981)	100%	<0.001
	L7	0.524 (-0.114–0.855)	80%	0.049
60 min cure	R1	0.079 (-0.549–0.650)	70%	0.409
	L1	0.282 (-0.385–0.756)	90%	0.200
	R3	0.44 (-0.22–0.823)	100%	0.088
	L3	0.758 (0.286–0.933)	80%	0.003
	R6	0.528 (-0.108–0.857)	90%	0.047
	L6	-0.023 (-0.616–0.587)	80%	0.527
	FR1	0.857 (0.526–0.962)	90%	<0.001
	FL1	0.843 (0.49–0.958)	90%	0.001
	R7	0.823 (0.438–0.952)	80%	0.001
	L7	0.768 (0.307–0.936)	90%	0.003

Comparison of internal deviation within the group for first observer (N = 30)

Group	Landmark	Mean ± SD	p-value*
No cure	R1	-0.48 (0.65)	0.140
	L1	-0.46 (0.67)
	R3	-0.18 (0.36)
	L3	-0.25 (0.54)
	R6	-0.66 (0.54)
	L6	-0.21 (0.8)
	FR1	-0.08 (0.4)
	FL1	-0.11 (0.32)
	R7	-0.38 (0.52)
	L7	-0.73 (0.74)
40 min cure	R1	-0.16 (0.33)	0.006
	L1	-0.19 (0.21)
	R3	-0.14 (0.1)
	L3**	-0.03 (0.1)
	R6	-0.13 (0.05)
	L6	-0.05 (0.17)
	FR1	0.07 (0.13)
	FL1	0.15 (0.03)
	R7	-0.09 (0.13)
	L7	-0.13 (0.08)
60 min cure	R1**	-0.03 (0.16)	<0.001
	L1	-0.11 (0.13)
	R3	-0.13 (0.13)
	L3**	-0.04 (0.22)
	R6	-0.15 (0.17)
	L6**	-0.03 (0.13)
	FR1	0.12 (0.07)
	FL1	0.18 (0.05)
	R7	-0.09 (0.18)
	L7**	-0.02 (0.12)

Post hoc analysis

Landmark	No cure vs 40 min cure	No cure vs 60 min cure	40 min cure vs 60 min cure
R1	0.249	0.067	0.762
L1	0.333	0.172	0.913
R3	0.910	0.859	0.993
L3	0.365	0.393	0.998
R6	0.004	0.004	0.997
L6	0.734	0.695	0.998
FR1	0.340	0.156	0.882
FL1	0.009	0.004	0.948
R7	0.133	0.139	1.000
L7	0.014	0.004	0.848