Table 4.

Distribution of failure modes by groups and loading type (n = 40).

Failure mode n (%)
	I	II	III	IV	V
Conventional preparation
Axial	1 (10)	0 (0)	4 (40)	0 (0)	5 (50)
Lateral	1 (10)	1 (10)	1 (10)	1 (10)	6 (60)
Modified preparation
Axial	1 (10)	0 (0)	1 (10)	0 (0)	8 (80)
Lateral	0 (0)	1 (10)	1 (10)	0 (0)	8 (80)

Type I: Cohesive failure; Type II: Adhesive failure; Type III: Cohesive-adhesive failure; Type IV: Fracture of the restoration/tooth complex above the cemento-enamel junction (CEJ); Type V: Fracture of the restoration/tooth complex below the cemento-enamel junction (CEJ).