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Table. 2.

Comparison of alveolar bone density (HU) in the maxilla between T1 and T2 measurements

Site T1 T2 Δ (T2–T1) p-value Number
Tuberosity 5 mm BC 763.0 ± 138.4 746.8 ± 102.2 −16.2 ± 80.7 0.677 5
LC 919.8 ± 117.8 892.2 ± 114.3 −27.6 ± 45.6 0.247 5
Can 212.2 ± 66.9 120.0 ±87.3 −92.2 ± 57.4 0.023* 5
10 mm BC 1,024.5 ± 277.0 1,034.5 ± 234.2 10.0± 107.2 > 0.999 4
LC 1,285.5 ± 215.8 1,215.5 ± 206.6 −70.0 ± 11.9 0.001** 4
Can - - - -
15 mm BC - - - - 0
LC - - - - 0
Can - - - - 0
Molar 5 mm BC 1,059.2 ± 138.1 1,053.2 ± 138.3 −6.0 ± 37.9 0.648 9
LC 1,198.0 ± 295.7 1,168.2 ± 282.8 −29.8 ± 65.1 0.185 10
Can 452.5 ± 247.0 394.4 ± 190.3 −58.1 ± 71.7 0.055 8
10 mm BC 1,243.1 ± 346.9 1,154.4 ± 310.9 −88.8 ± 133.7 0.103 8
LC 1,407.8 ± 249.5 1,392.1 ± 172.5 −15.7 ± 131.1 0.714 10
Can 204.5 ± 316.1 115.0 ± 87.7 −89.5 ± 228.4 0.678 2
15 mm BC 1,540.0 ± 156.1 1,460.5 ± 109.6 −79.5 ± 72.5 0.109 4
LC 1,110.4 ± 179.9 1,113.0 ± 193.5 2.6 ± 78.7 0.945 5
Can 174.0 277.0 103.0 - 1
Premolar 5 mm BC 1,225.7 ± 181.3 1,222.0 ± 261.7 −3.7 ± 126.9 0.929 10
LC 1,246.1 ± 163.1 1,274.6 ± 178.5 28.5 ± 83.0 0.306 10
Can 464.7 ± 271.2 372.4 ± 251.0 −92.3 ± 94.4 0.013* 10
10 mm BC 1,297.5 ± 387.9 1,271.8 ± 364.1 −25.7 ± 64.1 0.203 10
LC 1,353.1 ± 203.7 1,377.2 ± 219.8 24.1 ± 117.0 0.531 10
Can 380.6 ± 261.4 292.4 ± 236.0 −88.1 ± 55.7 0.006** 7
15 mm BC 1,639.6 ± 201.3 1,589.9 ± 174.5 −49.8 ± 116.7 0.263 8
LC 1,220.4 ± 319.8 1,197.9 ± 355.2 −22.6 ± 75.4 0.458 7
Can 220.5 ± 294.9 218.0 ± 253.1 −2.5 ± 41.7 0.655 2
Incisal 5 mm BC 1,101.3 ± 335.8 1,061.5 ± 286.6 −39.8 ± 92.9 0.093 10
LC 1,068.1 ± 268.4 1,040.1 ± 258.0 −28.0 ± 154.1 0.285 10
Can 568.8 ± 292.4 452.8 ± 255.2 −116.0 ± 135.7 0.046* 8
10 mm BC 1,043.6 ± 286.4 1,044.2 ± 324.3 0.6 ± 120.6 0.988 10
LC 1,303.1 ± 177.0 1,271.7 ± 207.9 −31.4 ± 142.3 0.333 10
Can 498.6 ± 201.7 416.2 ± 224.1 −82.3 ± 119.7 0.073 9
15 mm BC 1,360.1 ± 215.1 1,309.9 ± 272.6 −50.2 ± 70.0 0.059 10
LC 1,308.4 ± 165.3 1,273.0 ± 152.5 −35.4 ± 67.7 0.132 10
Can 235.6 ± 120.1 195.1 ± 112.5 −40.4 ± 39.9 0.016* 9

Values are presented as mean ± standard deviation or number only when only one measurement was possible.

Some measurements could not be obtained due to adjacent anatomic structures (i.e., third molar, maxillary sinus) or other objects (i.e., orthodontic miniscrew).

HU, Hounsfield units; T1, before surgery; T2, after surgery; BC, buccal cortical bone; LC, lingual cortical bone; Can, cancellous bone.

*p < 0.05,**p < 0.01.

The paired sample t-tests or Wilcoxon signed rank tests were performed (α = 0.05).

Korean J Orthod 2020;50:157~169 https://doi.org/10.4041/kjod.2020.50.3.157
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