pISSN 2234-7518
eISSN 2005-372X

Table. 3.

Comparison of changes in the tooth length from T0 to T1, which represents the degree of external apical root resorption, between the orthodontic aligner (OA) and fixed appliance (FA) groups

FDI tooth number T1–T0 Difference
(mm)
(FA–AO)
p-value
OA (n=19) FA (n=20)
Mean SD Mean SD
12 −0.53 0.51 −0.72 0.52 −0.18 0.187
11 −0.56 0.44 −0.53 0.50 0.03 0.928
21 −0.52 0.57 −0.86 0.60 −0.35 0.037*
22 −0.65 0.50 −0.87 0.71 −0.22 0.408
32 −0.66 0.45 −0.52 0.59 0.14 0.445
31 −0.73 0.62 −0.81 0.60 −0.08 0.467
41 −0.85 0.48 −0.88 0.56 −0.03 0.503
42 −0.77 0.55 −0.66 0.54 0.12 0.547

p-values were calculated using covariance analysis.

FDI, Federation Dentaire Internationale; T0, before treatment initiation; T1, 6 months after treatment initiation; SD, standard deviation.

*Statistically significant difference (p < 0.05).

Korean J Orthod 2021;51:329~336 https://doi.org/10.4041/kjod.2021.51.5.329
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