Table 3 Contingency tables show the net frequencies (and %) of 44 nonmetric traits/anomalies and crowding in different skeletal Angle classes, as well as associations between the presence of dental traits and dental occlusion classes
Trait/anomaly | With trait (%) | Without trait (%) | P | ||||
|---|---|---|---|---|---|---|---|
Cl I | Cl II | Cl III | Cl I | Cl II | Cl III | ||
Hyperdontia | 1 (50) | 1 (50) | 0 | 181 (55.7) | 126 (38.8) | 18 (5.5) | 0.911 |
Microdontia | 66 (52) | 51 (40.2) | 10 (7.9) | 116 (58) | 76 (38) | 8 (4) | 0.257 |
Peg-shaped lateral | 3 (33.3) | 6 (66.7) | 0 | 179 (56.3) | 121 (38.1) | 18 (5.7) | 0.204 |
Shoveling on central | 84 (48.6) | 80 (46.2) | 9 (5.2) | 98 (63.6) | 47 (30.5) | 9 (5.8) | 0.014 |
Shoveling on lateral | 90 (50) | 82 (45.6) | 8 (4.4) | 92 (62.6) | 45 (30.6) | 10 (6.8) | 0.021 |
Shoveling on canine | 78 (47.6) | 80 (48.8) | 6 (3.7) | 104 (63.8) | 47 (28.8) | 12 (7.4) | 0.001 |
Talon cusp on central | 24 (55.8) | 19 (44.2) | 0 | 158 (55.6) | 108 (38) | 18 (6.3) | 0.213 |
Talon cusp on lateral | 31 (47.7) | 31 (47.7) | 3 (4.6) | 151 (57.6) | 96 (36.6) | 15 (5.7) | 0.262 |
Talon cusp on canine | 38 (45.2) | 42 (50) | 4 (4.8) | 144 (59.3) | 85 (35) | 14 (5.8) | 0.051 |
Carabelli cusp on U6 | 104 (52.5) | 81 (40.9) | 13 (6.6) | 77 (60.2) | 46 (35.9) | 5 (3.9) | 0.316 |
Carabelli cusp on U7 | 73 (54.5) | 52 (38.8) | 9 (6.7) | 109 (56.5) | 75 (38.9) | 9 (4.7) | 0.453 |
Fifth cusp on U6 | 6 (66.7) | 2 (22.2) | 1 (11.1) | 176 (55.3) | 125 (39.3) | 17 (5.3) | 0.829 |
Hypocone absence—U7 | 73 (54.5) | 52 (38.8) | 9 (6.7) | 109 (56.5) | 75 (38.9) | 9 (4.7) | 0.718 |
Tuberculum sextum on L6 | 6 (66.7) | 2 (22.2) | 1 (11.1) | 176 (55.3) | 125 (39.3) | 17 (5.3) | 0.500 |
Hypoconulid absence—L7 | 152 (56.3) | 100 (37) | 18 (6.7) | 30 (52.6) | 27 (47.4) | 0 | 0.074 |
Protostylid | 7 (63.6) | 3 (27.3) | 1 (9.1) | 175 (55.4) | 124 (39.2) | 17 (5.4) | 0.674 |
Deflecting wrinkle on L6 | 47 (58) | 30 (37) | 4 (4.9) | 135 (54.9) | 97 (39.4) | 14 (5.7) | 0.878 |
Deflecting wrinkle on L7 | 4 (40) | 5 (50) | 1 (10) | 178 (56.2) | 122 (38.5) | 17 (5.4) | 0.559 |
Canine mesial ridge | 12 (63.2) | 7 (36.8) | 0 | 170 (55.2) | 120 (39) | 18 (5.8) | 0.513 |
Distal trigonid crest on L6 | 7 (58.3) | 5 (41.7) | 0 | 175 (55.6) | 122 (38.7) | 18 (5.7) | 0.695 |
Distal trigonid crest on L7 | 14 (53.8) | 10 (38.5) | 2 (7.7) | 168 (55.8) | 117 (38.9) | 16 (5.3) | 0.877 |
Canine distal accessory ridge | 52 (43.7) | 61 (51.3) | 6 (5) | 130 (62.5) | 66 (31.7) | 12 (5.8) | 0.002 |
Hypoconulid absence—L6 | 31 (54.4) | 24 (42.1) | 2 (3.5) | 151 (55.9) | 103 (38.1) | 16 (5.9) | 0.701 |
Sixth cusp on U6 | 1 (100) | 0 | 0 | 181 (55.5) | 127 (39) | 18 (5.5) | 0.671 |
Fifth cusp on U7 | 3 (42.9) | 4 (57.1) | 0 | 179 (55.9) | 123 (38.4) | 18 (5.6) | 0.543 |
Accessory cusp on mesial marginal ridge—4 | 4 (57.1) | 3 (42.9) | 0 | 178 (55.6) | 124 (38.8) | 18 (5.6) | 0.808 |
Accessory cusp on mesial marginal ridge—5 | 5 (62.5) | 1 (12.5) | 2 (25) | 177 (55.5) | 126 (39.5) | 16 (5) | 0.027 |
Accessory cusp on mesial marginal ridge—6 | 28 (62.2) | 13 (28.9) | 4 (8.9) | 154 (54.6) | 114 (40.4) | 14 (5) | 0.244 |
Accessory cusp on mesial marginal ridge—7 | 21 (58.3) | 15 (41.7) | 0 | 161 (55.3) | 112 (38.5) | 18 (6.2) | 0.307 |
Accessory cusp on distal marginal ridge—4 | 3 (50) | 2 (33.3) | 1 (16.7) | 179 (55.8) | 125 (38.9) | 17 (5.3) | 0.480 |
Accessory cusp on distal marginal ridge—5 | 18 (56.3) | 10 (31.3) | 4 (12.5) | 164 (55.6) | 117 (39.7) | 14 (4.7) | 0.159 |
Accessory cusp on distal marginal ridge—6 | 8 (57.1) | 6 (42.9) | 0 | 174 (55.6) | 121 (38.7) | 18 (5.8) | 0.647 |
Accessory cusp on distal marginal ridge—7 | 5 (38.5) | 8 (61.5) | 0 | 174 (55.4) | 122 (38.9) | 18 (5.7) | 0.660 |
Accessory cusp on lingual—L4 | 31 (39.7) | 43 (55.1) | 4 (5.1) | 151 (60.6) | 84 (33.7) | 14 (5.6) | 0.003 |
Accessory cusp on lingual—L5 | 92 (51.1) | 80 (44.4) | 8 (4.4) | 90 (61.2) | 47 (32) | 10 (6.8) | 0.062 |
Mesial accessory ridge—4 | 41 (66.1) | 21 (33.9) | 0 | 141 (53.2) | 106 (40) | 18 (6.8) | 0.045 |
Mesial accessory ridge—5 | 95 (56.2) | 67 (39.6) | 7 (4.1) | 87 (55.1) | 60 (38) | 11 (7) | 0.533 |
Mesial accessory ridge—6 | 1 (100) | 0 | 0 | 181 (55.5) | 127 (39) | 18 (5.5) | 0.671 |
Distal accessory ridge—4 | 114 (52.3) | 92 (42.2) | 12 (5.5) | 68 (62.4) | 35 (32.1) | 6 (5.5) | 0.198 |
Distal accessory ridge—5 | 130 (54.2) | 97 (40.4) | 13 (5.4) | 52 (59.8) | 30 (34.5) | 5 (5.7) | 0.621 |
Tuberculum intermedium on L6 | 15 (75) | 5 (25) | 0 | 167 (54.4) | 122 (39.7) | 18 (5.9) | 0.161 |
Tuberculum intermedium on L7 | 2 (50) | 2 (50) | 0 | 180 (55.7) | 125 (38.7) | 18 (5.6) | 0.829 |
Tuberculum sextum on L7 | 0 | 3 (100) | 0 | 182 (56.2) | 124 (38.3) | 18 (5.6) | 0.092 |
Accessory cusp on lingual—L7 | 4 (80) | 1 (20) | 0 | 178 (55.3) | 126 (39.1) | 18 (5.6) | 0.526 |