Method: Specimens of five titanium–porcelain combinations were prepared in a rectangular shape for a four-point bending interfacial fracture mechanics test. The pre-cracked specimen was loaded and the strain energy release rate (G, J/ m²) was calculated for each system.
Results: The titanium/porcelain with GoldBonder bonding system showed the highest G-value (68.96+/- 12.59 J/m²) whilst titanium/cross-cut-bur showed the lowest (5.69 +/- 1.34 J/m²). The former was significantly higher than that of Wiron®99 (noble-metal, BEGO, Germany) /porcelain (40.3 +/- 4.8 J/m²), which is a clinically accepted bonding system since many years. The G-values of porcelain fused to titanium/Rocatec, titanium/sandblasted and/or titanium/GC-Bonder were 10.30+/- 1.49, 12.04+/- 3.01 and 37.14+/- 4.79 J/m², respectively.
Conclusion: The strain energy release rate (G-value) of titanium/porcelain with GoldBonder (Kerabond®, Wieland, Germany) was highest among the five systems.
Supported by GC Europe