Table 4.
Comparison of Median Esthetic Scores of Different Smile Variables as Evaluated Collectively by Fourth- and Fifth-Year Dental Students (n=145 [Fourth Year=78, Fifth Year=67])
| Smile Variables | Level | Images’ Median (IQR) Scores | ||||
|---|---|---|---|---|---|---|
| A | B | C | D | E | ||
| Smile arc | Fourth year | 4 (2) | 5 (2) | 6 (2) | – | – |
| Fifth year | 6 (3) | 5 (4) | 7 (3) | – | – | |
| P-value | <0.001 | 0.030a | 0.026 | – | – | |
| Buccal corridor | Fourth year | 6 (2) | 7 (3) | 6 (3) | – | – |
| Fifth year | 7 (3) | 7 (3) | 7 (2) | – | – | |
| P-value | 1.00 | 0.944 | 0.028 | – | – | |
| Gingival display | Fourth year | 5 (3) | 6 (3) | 3 (3) | 3 (4) | 2 (2) |
| Fifth year | 4 (2) | 5 (2) | 2 (3) | 2 (3) | 1 (3) | |
| P-value | 0.016 | 0.482 | 0.022 | 0.179 | 0.29 | |
| Midline diastema | Fourth year | 5 (3) | 4 (2) | 4 (2) | 4 (3) | 7 (2) |
| Fifth year | 4 (2) | 3 (2) | 4 (2) | 2.50 (2) | 6 (3) | |
| P-value | 0.550 | 0.090 | 0.059 | 0.048 | 0.269 | |
| Crown length | Fourth year | 3 (2) | 2 (3) | 5 (3) | 2 (2) | 1 (2) |
| Fifth year | 3 (2) | 1 (3) | 5 (4) | 1 (2) | 0.0 (2) | |
| P-value | 0.006b | 0.185 | 0.339 | 0.328 | 0.100 | |
| Crown width | Fourth year | 5 (2) | 3 (3) | 3.50 (3) | 3 (3) | 5 (3) |
| Fifth year | 5 (2) | 3 (2) | 3 (4) | 2 (2) | 4.50 (2) | |
| P-value | 0.111 | 0.012c | 0.882 | 0.027 | 0.124 | |
Notes: a5th year mean rank higher than 4th year; b4th year mean rank higher than 5th year; c4th year mean rank higher than 5th year.
Abbreviation: IQR, interquartile range.