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Table. 3.

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

Site T1 T2 Δ (T2–T1) p-value Number
Retromolar pad 5 mm BC 1,695.6 ± 337.5 1,640.5 ± 269.0 −55.1 ± 94.0 0.093 10
LC 1,196.6 ± 361.7 1,145.7 ± 329.9 −50.9 ± 38.4 0.002** 10
Can 219.1 ± 130.9 150.8 ± 105.5 −68.3 ± 91.1 0.042* 10
10 mm BC 1,904.1 ± 93.8 1,824.8 ± 146.7 −79.3 ± 129.2 0.084 10
LC 1,759.1 ± 74.3 1,661.3 ± 62.0 −97.8 ± 110.7 0.021* 10
Can 245.9 ± 127.6 175.4 ± 103.4 −70.5 ± 57.6 0.004** 10
15 mm BC 1,919.8 ± 102.4 1,904.3 ± 105.7 −15.5 ± 32.3 0.163 10
LC 1,723.8 ± 102.6 1,700.0 ± 100.9 −23.8 ± 84.3 0.395 10
Can 159.4 ± 99.3 102.3 ± 109.4 −57.1 ± 62.4 0.018* 10
Molar 5 mm BC 1,575.5 ± 95.9 1,541.6 ± 121.9 −33.9 ± 70.9 0.165 10
LC 1,660.9 ± 123.1 1,577.8 ± 113.3 −83.1 ± 65.9 0.003** 10
Can 548.9 ± 172.4 449.7 ± 147.4 −99.2 ± 72.2 0.002** 10
10 mm BC 1,829.2 ± 103.6 1,749.2 ± 166.2 −80.0 ± 86.2 0.017* 10
LC 1,800.1 ± 88.0 1,750.3 ± 127.3 −49.8 ± 80.4 0.082 10
Can 188.7 ± 156.3 110.9 ± 149.0 −77.8 ± 72.9 0.008** 10
15 mm BC 1,886.8 ± 89.7 1,820.7 ± 102.9 −66.1 ± 105.6 0.079 10
LC 1,796.2 ± 121.6 1,757.6 ± 103.9 −38.6 ± 61.5 0.078 10
Can 111.9 ± 157.0 71.4 ± 136.8 −40.5 ±30.6 0.002** 10
Premolar 5 mm BC 1,435.5 ± 148.6 1,369.2 ± 131.7 −66.3 ± 53.7 0.004** 10
LC 1,589.5 ± 112.8 1,505.9 ± 143.3 −83.6 ± 88.7 0.015* 10
Can 183.9 ± 142.8 132.4 ± 123.1 −51.5 ± 47.4 0.007** 10
10 mm BC 1,573.2 ± 175.6 1,544.2 ± 118.0 −29.0 ± 167.6 0.598 10
LC 1,782.5 ± 115.6 1,700.3 ± 107.0 −82.2 ± 105.1 0.035* 10
Can 211.9 ± 136.3 137.2 ± 135.0 −74.7 ± 88.1 0.009** 10
15 mm BC 1,852.0 ± 139.8 1,758.9 ± 133.2 −83.1 ± 101.7 0.030* 10
LC 1,883.1 ± 106.4 1,804.8 ± 121.5 −78.3 ± 99.3 0.034* 10
Can 156.5 ± 185.2 89.8 ± 150.9 −66.7 ± 50.3 0.002** 10
Incisal 5 mm BC 764.6 ± 208.1 713.5 ± 214.9 −51.1 ± 55.9 0.018* 10
LC 1,051.4 ± 159.6 984.7 ± 204.4 −66.7 ± 90.1 0.044* 10
Can 510.0 ± 204.5 407.3 ± 219.2 −102.7 ±73.5 0.002** 10
10 mm BC 1,142.0 ± 358.7 1,129.6 ± 383.9 −12.4 ± 51.6 0.467 10
LC 1,464.7 ± 253.3 1,446.3 ± 264.7 −18.4 ± 37.8 0.241 10
Can 662.3 ± 204.3 572.8 ± 212.7 −89.6 ± 34.5 < 0.001*** 9
15 mm BC 1,632.3 ± 259.6 1,596.3 ± 241.6 −36.0 ± 69.0 0.133 10
LC 1,881.5 ± 134.9 1,793.9 ± 197.1 −87.6 ± 113.0 0.037* 10
Can 517.2 ± 240.0 423.0 ± 172.6 −94.2 ± 88.5 0.013* 9

Values are presented as mean ± standard deviation.

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, ***p < 0.001.

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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