From: Dental arch form and arch dimensions among a group of Egyptian children and adolescents
 |  | Deciduous | Mixed | Permanent |
---|---|---|---|---|
Upper TAL | Mean | – | 32.86 | 35.74 |
 | SD | – | 7.97 | 12.87 |
Lower TAL | Mean | – | 29.19 | 30.42 |
 | SD | – | 6.88 | 9.76 |
Upper AAL | Mean | 8.35 | 7.92 | 9.90 |
 | SD | 3.62 | 2.31 | 5.00 |
Lower AAL | Mean | 4.63 | 4.70 | 5.42 |
 | SD | 1.90 | 1.75 | 2.17 |