Table 3.
Average Dimensions of Lower Third Molars in mm with Respect to Pell and Gregory’s Classification
| Dimension | Pell & Gregory’s classification of mandibular third molars | |||
|---|---|---|---|---|
|
| ||||
| Class I (N=32) | Class II (N=76) | Class III (N=7) | P | |
| Total length | 17.87 | 18.40 | 20.00 | >0.05 |
|
| ||||
| Length of the crown | 7.47 | 7.93 | 7.86 | >0.05 |
|
| ||||
| Length of the root | 11.19 | 10.52 | 11.80 | >0.05 |
|
| ||||
| Mesiodistal diameter of the crown | 9.52 | 9.94 | 10.50 | <0.01† |
|
| ||||
| Mesiodistal diameter of the crown at the cervix | 8.73 | 9.10 | 9.00 | >0.05 |
|
| ||||
| Buccolingual diameter of the crown | 8.54 | 8.68 | 9.14 | >0.05 |
|
| ||||
| Buccolingual diameter of the crown at the cervix | 7.80 | 8.14 | 8.28 | >0.05 |
|
| ||||
| Length of the root DC | 10.66 | 10.47 | 11.77 | >0.05 |
|
| ||||
| Mesiodistal diameter of the crown DC* | 9.34 | 9.81 | 10.37 | <0.01† |
|
| ||||
| Buccolingual diameter of the crown DC* | 8.46 | 8.38 | 9.10 | >0.05 |
*
Digital caliper;
†
One-way between groups ANOVA.