Table 2.

Knife-Edge Preparation

NO	A	B	C
1	1.4	280	−
2	2.3	350	−
3	1.4	400	+
4	3	400	+
5	1.2	450	+
6	2.1	350	−
7	2	400	+
8	3	300	−
9	1.3	330	+
10	2.5	400	+
11	1.2	200	+
12	1.3	280	−
13	1.9	450	+
14	3	320	−
15	1.5	400	−

A-Distance between the margin and the CEJ. in mm. B- Depth of preparation in μ. C- Dentinal exposure