The Effect of Artificial Aging on The Bond Strength of Heat-activated Acrylic Resin to Surface-treated Nickel-chromium-beryllium Alloy

Table 2: Group coding system and the three surface treatments used in the study.

Group coding		Surface treatment description
No-Therm*	After-Therm*
SA	SA-TH	Sandblasting with 50 µm Al₂O₃ grains at 3.4 atm for 30 seconds
SAMP	SAMP-TH	Sandblasting with 50 µm Al₂O₃ grains at 3.4 atm for 30 seconds and application of Metal Primer II
RSOP	RSOP-TH	Rocatec procedure and application of silanizing agent (3M-ESPE Sil) and opaque veneer
RS	RS-TH	Rocatec procedure and application of silanizing agent (3M-ESPE Sil)

* No thermocycling.* After thermocycling.