Table 5.
Trait prevalence in the upper primary molars
Merkmalsprävalenz der oberen Milchmolaren
| Trait/Grade | First molars | Second molars | χ2 test | |||||
|---|---|---|---|---|---|---|---|---|
| (laterality) | (dimorphism) | |||||||
| um1 (r) | um1 (l) | um2 (r) | um2 (l) | um1 | um2 | um1 | um2 | |
| CARABELLI TRAIT, n (%) | ||||||||
| 0. Smooth mesiolingual surface | 40(100.0) | 39(100.0) | 18(28.6) | 21(31.8) | – | 0.957 | – | 0.383 |
| 1. Pit, groove | – | – | 26(41.3) | 24(36.4) | ||||
| 2. Two grooves are parallel | – | – | 6(9.5) | 7(10.6) | ||||
| 3. The area between grooves raised | – | – | 8(12.7) | 10(15.1) | ||||
| 4. Free apex | – | – | 5(7.9) | 4(6.1) | ||||
| CROWN PATTERN (first molars), n (%) | ||||||||
| 2. Protocone and paracone | 28(73.7) | 27(77.1) | – | – | 0.905 | – | 0.133 | – |
| 3M. Protocone, paracone and metacone | 3(7.9) | 3(8.6) | – | – | ||||
| 3H. Protocone, paracone and hypocone | 3(7.9) | 3(8.6) | – | – | ||||
| 4−. Four cusps present but hypocone reduced | 4(10.5) | 2(5.7) | – | – | ||||
| CROWN PATTERN (second molars), n (%) | ||||||||
| 3. The distal marginal ridge has a groove | – | – | 7(10.9) | 8(12.1) | – | 0.976 | – | 0.469 |
| 4−. Distal marginal ridge without interruption | – | – | 15(23.4) | 15(22.7) | ||||
| 4. Large hypocone | – | – | 42(65.2) | 43(65.1) | ||||
| METACONULE, n (%) | ||||||||
| 0. Absent | 38(100.0) | 35(100.0) | 61(98.4) | 64(98.5) | – | 0.973 | – | 0.227 |
| 1. Present | – | – | 1(1.6) | 1(1.5) | ||||
| PARASTYLE, n (%) | ||||||||
| 0. Absent | 40(100.0) | 39(100.0) | 65(100.0) | 68(100.0) | – | – | – | – |
u upper, m molar, 1 first, 2 second, (r) right, (l) left