Effect of experimental resin cements containing thio-urethane oligomers on the durability of ceramic-composite bonded interfaces

Figures & data

Table 1. Means of microtensile bond strength (µTBS) ± Standard Deviation (MPa) for the experimental control (EC), for the cements modified with aromatic (BDI) and aliphatic (HDDI) thiourethanes, and for the commercial control (RelyX Ultimate).

Resin Cements	µTBS (MPa)
	24 h	Thermal fatigue	Mechanical fatigue
Experimental Control (EC)	30.2 ± 2.2 Ab	24.9 ± 2.5 Bc	23.8 ± 1.5 Bc
BDI	36.5 ± 1.1 Aa	29.9 ± 1.7 Bb	28.6 ± 1.7 Bb
HDDI	38.6 ± 1.9 Aa	34.2 ± 3.3 Ba	33.1 ± 1.7 Ba
RelyX Ultimate	38.8 ± 2.5 Aa	33.1 ± 2.1 Bab	30.5 ± 2.6 Bab

Values followed by the same lower-case superscript within the same column and upper-case superscript in the same row are statistically similar (α = 5%).

Table 2. Failure Mode Analysis of the Debonded Specimens - % among groups and (number of sticks)^a.

Resin	Aging condition	Failure Modes
Cement		Mode 1	Mode 2	Mode 3	Mode 4	Mode 5
24 hours	EC	39 (56)	4 (6)	13 (19)	4 (6)	40 (57)
	BDI	37 (50)	6 (8)	8 (11)	8 (11)	41 (56)
	HDDI	32 (46)	8 (12)	14 (20)	8 (12)	38 (54)
	Rely X Ultimate	33 (47)	5 (7)	15 (22)	8 (12)	39 (56)
		p = .6337
Tc	EC	48 (69)	4 (6)	10 (14)	5 (7)	33 (48)
	BDI	47 (68)	7 (10)	18 (26)	2 (3)	26 (37)
	HDDI	45 (61)	5 (7)	16 (22)	7 (9)	27 (37)
	Rely X Ultimate	42 (60)	9 (13)	12 (17)	6 (9)	31 (45)
		p = .3072
Mf	EC	51 (73)	3 (4)	18 (26)	4 (6)	24 (35)
	BDI	49 (71)	7 (10)	16 (23)	2 (3)	26 (37)
	HDDI	49 (71)	4 (6)	17 (24)	4 (6)	26 (37)
	Rely X Ultimate	45 (61)	4 (6)	11 (15)	2 (3)	38 (51)
		p = .3552

^a Failure modes: adhesive between cement and ceramic (mode 1); cohesive within ceramic (mode 2); cohesive within resin cement (mode 3); cohesive within composite resin (mode 4); and mixed, involving resin cement, composite resin and ceramic (mode 5). No adhesive failures were observed between the cement and the composite.