From: Dental arch form and arch dimensions among a group of Egyptian children and adolescents
 |  | Deciduous | Mixed | Permanent |
---|---|---|---|---|
Upper arch perimeter (AP) | Mean | 81.19 | 92.54 | 104.74 |
 | SD | 11.78 | 10.51 | 22.61 |
Lower arch perimeter (AP) | Mean | 72.79 | 88.29 | 97.81 |
 | SD | 15.57 | 10.33 | 20.41 |