Measurement

Mean enamel dentine thickness before preparations (mm ± SD)

Group

Mandibular teeth

Finish Line

Mesial

(Mce)

Distal

(Dce)

Lingual

(Lce)

Buccal

(Bce)

1

Upper Laterals

Shoulder

1.70 ± 0.09

1.58 ± 0.16

2.28 ± 0.41

2.23 ± 0.31

2

Chamfer

1.52 ± 0.31

1.62 ± 0.22

2.02 ± 0.32

2.11 ± 0.15

3

Knife Edge

1.60 ± 0.10

1.62 ± 0.18

2.05 ± 0.21

1.80 ± 0.20

4

Lower Centrals

Shoulder

1.60 ± 0.12

1.63 ± 0.18

2.08 ± 0.22

2.30 ± 0.12

5

Chamfer

1.52 ± 0.23

1.43 ± 0.30

2.25 ± 0.25

2.22 ± 0.11

6

Knife Edge

1.55 ± 0.16

1.47 ± 0.18

2.05 ± 0.21

2.02 ± 0.20

7

Lower Laterals

Shoulder

1.58 ± 0.22

1.65 ± 0.28

2.15 ± 0.29

2.03 ± 0.22

8

Chamfer

1.38 ± 0.20

1.45 ± 0.10

2.13 ± 0.17

2.05 ± 0.14

9

Knife Edge

1.55 ± 0.16

1.47 ± 0.18

2.12 ± 0.33

1.97 ± 0.21