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Table 1 Mean and standard deviation of total arch length and anterior arch length in upper and lower arches in deciduous, mixed, and permanent dentitions

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