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Table 5 Distributions of Type 1 and Type 2 in skeletal Class I, II and III malocclusions

From: Three-dimensional assessment of the favorability of maxillary posterior teeth intrusion in different skeletal classes limited by the vertical relationship with the maxillary sinus floor

Root type Score Sagittal view P-value Coronal view P-value
Class I Class II Class III Class I Class II Class III
U4 Type 1 182(34.4) 178(33.6) 169(31.9) 0.635 173(33.7) 173(33.7) 167(32.6) 0.113
Type 2C 17(34.0) 18(36.0) 15(30.0) 20(32.3) 26(41.9) 16(25.8)
Type 2LC 1(11.1) 5(55.6) 3(33.3) 1(16.7) 2(33.3) 3(50.0)
Type 2P 4(50.0) 3(37.5) 1(12.5) 10(66.7) 3(20.0) 2(13.3)
U5 Type 1 120(35.1) 109(31.9) 113(33.0) 0.375 121(35.6) 107(31.5) 112(32.9) 0.006
Type 2C 30(28.6) 40(38.1) 35(33.3) 38(27.3) 56(40.3) 45(32.4)
Type 2LC 11(26.8) 16(39.0) 14(34.1) 2(12.5) 4(25.0) 10(62.5)
Type 2P 43(39.8) 39(36.1) 26(24.1) 43(42.6) 37(36.6) 21(20.8)
U6MB Type 1 107(37.8) 91(32.2) 85(30.0) 0.007 107(37.2) 86(29.9) 95(33.0) <0.001
Type 2C 30(24.0) 39(31.2) 56(44.8) 31(31.0) 38(38.0) 31(31.0)
Type 2LC 2(28.6) 4(57.1) 1(14.3) 6(9.4) 32(50.0) 26(40.6)
Type 2P 65(35.9) 70(38.7) 46(25.4) 60(41.7) 48(33.3) 36(25.0)
U6DB Type 1 102(35.1) 90(30.9) 99(34.0) 0.214 111(37.2) 94(31.5) 93(31.2) 0.004
Type 2C 42(29.8) 58(41.1) 41(29.1) 30(25.6) 56(47.9) 31(26.5)
Type 2LC 0(0.0) 3(60.0) 2(40.0) 12(22.2) 18(33.3) 24(44.4)
Type 2P 60(37.7) 53(33.3) 46(28.9) 51(40.2) 36(28.3) 40(31.5)
U6P Type 1 93(32.7) 89(31.3) 102(35.9) 0.004 103(34.6) 92(30.9) 103(34.6) 0.01
Type 2C 24(28.9) 27(32.5) 32(38.6) 19(34.5) 22(40.0) 14(25.5)
Type 2LC 1(6.3) 9(56.3) 6(37.5) 11(16.4) 29(43.3) 27(40.3)
Type 2P 86(40.4) 79(37.1) 48(22.5) 71(40.3) 61(34.7) 44(25.0)
U7MB Type 1 78(32.9) 78(32.9) 81(34.2) 0.001 79(34.2) 80(34.6) 72(31.2) 0.001
Type 2C 21(24.7) 30(35.3) 34(40.0) 34(25.8) 50(37.9) 48(36.4)
Type 2LC 3(11.5) 17(65.4) 6(23.1) 1(4.0) 10(40.0) 14(56.0)
Type 2P 102(41.1) 79(31.9) 67(27.0) 90(43.3) 64(30.8) 54(26.0)
U7DB Type 1 88(32.0) 95(34.5) 92(33.5) 0.007 100(34.7) 93(32.3) 95(33.0) 0.007
Type 2C 17(21.8) 28(35.9) 33(42.3) 33(25.6) 56(43.4) 40(31.0)
Type 2LC 0(0.0) 0(0.0) 2(100.0) 3(13.0) 9(39.1) 11(47.8)
Type 2P 99(41.1) 81(33.6) 61(25.3) 68(43.6) 46(29.5) 42(26.9)
U7P Type 1 110(32.2) 115(33.6) 117(34.2) 0.004 129(34.6) 125(33.5) 119(31.9) 0.82
Type 2C 23(30.7) 28(37.3) 24(32.0) 29(28.4) 39(38.2) 34(33.3)
Type 2LC 3(11.1) 10(37.0) 14(51.9) 10(34.5) 11(37.9) 8(27.6)
Type 2P 68(44.7) 51(33.6) 33(21.7) 36(39.1) 29(31.5) 27(29.3)
  1. Chi-square test