Retention strength of monolithic zirconia crowns cemented with different primer-cement systems

BMC Oral Health

Table 3 Comparison of failure frequency between different studied groups (No-%)

	Class 1	Class 2	Class 3	Class 4	Class 5	Sig
Group M (n = 10)	0(0%)	3(30%)	2(20%)	3(30%)	2(20%)	P < 0.001
Group P (n = 10)	4(40%)	5(50%)	1(10%)	0(0%)	0(0%)
Group D (n = 10)	4(40%)	2(20%)	4(40%)	0(0%)	0(0%)

Class 1: Adhesive failure (cement principally on prepared dentin > 3/4 of axial surface)
Class 2: Mixed adhesive and cohesive failure (cement on crown intaglio and prepared dentin)
Class 3: Adhesive failure (cement principally on crown; > 3/4 of the intaglio)
Class 4: Cohesive failure (zirconia crown fracture)
Class 5: Cohesive failure (tooth fracture)

ISSN: 1472-6831