Silane coupling agent used

n = 6

Fracture energy (Kgf-mm)

UDMA/TEGDMA-based CR

Bis-GMA/TEGDMA-based CR

Mean

S.D.

Mean

S.D.

L-SCA

4.7^a

0.8

2.8^b

1.2

KBM-5803

4.4^a

1.0

2.7^b

0.7

KBM-503

3.4^a

0.9

1.9^b

0.4