Table 2.

Volume of silver nitrate penetration (mm³) along the interface in Class-I preparations restored with either a high- or low-shrinkage composite

Sample No.	Group Ia	Group IIb
1	1.4	0.0d
2	2.0	0.0d
3	1.4	0.0d
4	1.9	0.1
5	0.6	0.4
6	2.6	0.0d
7	0.7	0.0d
8	1.0	0.0d
9	0.9	0.0d
10	0.7	0.0d
Mean	1.3 (0.7)c	0.3 (0.3)c

^aGroup I = Class-I preparations restored with Z100 (high-shrinkage composite)

^bGroup II= Class-I preparations restored with LS (low-shrinkage composite)

^cStandard deviation

^dWhere silver nitrate was not found visually the volume of microleakage was assumed to be 0.0 mm³