Objectives: The aim of this study was to evaluate the shear bond strength of three luting agents to a machinable feldspatic ceramic under different pretreatment methods of the ceramic material.

Methods: RelyX Unicem (3M ESPE), Calibra (Dentsply) and Variolink (Ivoclar-Vivadent) were used as resin cements. They were bonded to machine milled feldspatic ceramic disks, which were pretreated in five different ways: [A]: no pretreatment of the ceramic; [B]: ceramic etched with HF; [C]: silanizing; [D]: ceramic etched and silanized; [E]:ceramic etched with HF, silanized and treated with Heliobond (Ivoclar-Vivadent). The shear bond strength of 10 specimens per material and per ceramic pretreatment were tested initially, after 5*10³ thermocycles and after 10⁴ thermocycles. Results: Mean values of shear bond strength in MPa:

ceramic treatment	[A]			[B]			[C]
tested at:	initial	5*103	104	initial	5*103	104	initial	5*103	104
Calibra	4,41	**	**	7,41	11,2	9,81	3,31,2	**	**
Variolink	5,4	6,1	**	9,6	9,4	9,42	12,51	16,8	18,4
Unicem	6,71	5,9	8,3	9,91	13,8	15,11,2	12,22	15,6	12,4

ceramic treatment	[D]			[E]
tested at:	initial	5*103	104	initial	5*103	104
Calibra	7,401,2	10,71,2	10,31,2	12,0	15,51	11,11,2
Variolink	17,61,3	15,11,3	18,61	16,8	24,81	25,01
Unicem	12,82,3	22,22,3	20,92	12,5	20,4	24,32

** = debonding during thermocycling

The superscript letters within the same column indicate a significant difference according to the U-test at p £ .05, (Bonferroni corrected).

Conclusion: Due to the results of this study a simplification of ceramic treatment in combination with Variolink and RelyX Unicem seems to be possible. For the Calibra material only the complete pretreatment procedure [E] should be used and lead to reliable adhesion values.

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