Objectives: The bond between glass fiber-reinforced frameworks and veneering resins can fail under clinical conditions. Electron beam irradiation is told to improve the bond strength.

Methods: cylinders ( h= 3mm, Ø 5mm²) of the composite Sinfony and an exp. material were bond on a restricted area of Ø 5mm² to plan parallel rectangular specimens (20x10x3 mm) of the glass fibre systems Vectris frame (exp. Material) (VF/X) and StickNet (Sinfony) (SN/S). Groups manufactured with the correspondent surfaces conditioner (cond): wetting agent for the exp. Material and Sinfony activator for Sinfony and without any pre-treatment (no). From the four different groups,the compressive strength was determined after 24h, electron beam irradiation (100KGy) (Irr) and after irradiation (100KGy) + 12.000 thermo cycles (5°/55°C) (Irr TC). Mean and std. dev. were calculated.

Results:

	24h cond.	24h no	Irr cond.	Irr no	Irr TC cond.	Irr TC no
VF/X [MPa]	15.1 ± 4.1	6.7 ± 1.6	18 ± 3.4	22.1 ± 4.3	18.6 ± 4.9	20.8 ± 4.3
SN/S [MPa]	15.1 ± 3.3	8.6 ± 2	19.9 ± 4	13.7 ± 2.9	12.2 ± 2.5	15.4 ± 4.1

The compressive strength increased for Vectris frame and StickNet using electron beam irradiation. The use of silane coupling agents such as wetting agent can be avoided, while StickNet needed conditioning and irradiation to improve the bond. However, the values decreased for StickNet after thermal cycling.

Conclusion: Electron beam irradiation can improve the bond strength between glass fiber-reinforced frameworks and veneering composites without using silane coupling agents.

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