Objectives : The pursuit of an optimized adhesive interface with indirect restorative materials continues. This study evaluated the shear bond strength of adhesive interfaces created with ResiCem (Shofu Inc., Kyoto, Japan) and zirconia or Cp Titanium.
Materials and methods : Eight treatment groups for Cp titanium (Ti) were evaluated ( n = 10): air abrasion (AB) for 0, 16, 34, and 50 psi with (T) and without thermocycling (TiAB0, TiABT0, TiAB16, TiABT16, TiAB34, TiABT34, TiAB50, TiABT50). Four groups for zirconia (Z) were evaluated: ZAB0, ZABT0, ZAB50, ZABT50. A jig exposed a 3 mm × 5 mm bonding area on each of two 30 mm × 5 mm bars. After ultrasonic cleaning, AZ Primer (Shofu) was applied to the Z bars and ML Primer (Shofu) applied to the Ti bars. Air abraded surfaces received 50 μm aluminum oxide for 10 s with the designated pressure before treatment. A layer of autopolymerizing cement was placed between the two bars and a 1 kg load applied during polymerization. Thermocycled groups cycled between 6 and 50 °C for 2500 cycles with a 30 s dwell time. Storage was in 37 °C distilled water for one week. A tensile load was placed on each end of the bars with an ElectroPuls 3000 (Instron) at a rate of 1 mm/min. One-way ANOVA was performed for each material. Results :
| Group | TiAB0 | TiAB16 | TiAB34 | TiAB50 | ZAB0 | ZAB50 |
|---|---|---|---|---|---|---|
| Not Thermocycled | 13.25 (3.65)Aa | 20.41 (5.01)Ab | 22.98 (3.23)Ab | 23.17 (2.72)Ab | – | – |
| Thermocycled | 9.32 (1.50)Ba | 16.86 (3.72)Ab | 18.63 (3.20)Bb,c | 21.31 (3.17)Ac | – | – |
| Not Thermocycled | – | – | – | – | 15.78 (4.11)Aa | 26.59 (8.81)Ab |
| Thermocycled | – | – | – | – | 10.93 (3.51)Ba | 21.05 (5.40)Ab |
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