IADR Abstract Archives
Pull-off Bond-strength of Polymer-based Crowns to CAD/CAM Prepared Human Teeth
Objectives: To evaluate the adhesive performance of crowns made of two different CAD/CAM materials (LuxaCam, DMG, LUX; Lava Ultimate, 3M, LAV) bonded to natural teeth using six resin different cements.
Methods: A standard preparation (3 mm height, 6° axial convergence, 0.5 mm chamfer finish line) was designed and prepared into 144 extracted human teeth using a CAD/CAM milling machine (CEREC inLab MC XL). Based on this preparation, crowns were designed and milled out of two polymer-based CAD/CAM materials (LUX, LAV). After sandblasting the internal surface of each crown (50 μm Al2O3, 13 s) and cleaning (ethanol in ultrasonic bath, 5 min), the crowns were cemented with one of six cements (1.experimental cement, 2.RelyX Ultimate, 3.DuoCem, 4.Multilink Automix, 5.RelyX Unicem2, 6.Ketac Cem Plus), according to the manufacturers’ instructions. All crowns were seated onto the preparation, loaded under 1 kg load using a seating device and light cured for 20 s/ surface using LED curing unit.
Specimens were subjected to artificial aging by thermo-cycling (20K cycles at 5 °C-55 °C, immersion time 30 s, transfer time 10 s), 6 months of water storage at 37 °C, and cyclic fatiguing (1.2M cycles at 1.6 Hz, 49 N load). Pull-off bond strength was measured using a universal testing machine by loading specimens until failure. Failure mode was reported. Statistical analysis was performed using Mann-Whitney U tests at α=0.001.
Results: The obtained data is presented in table 1.
Conclusions: The adhesive performance of both polymer-based crown materials to CAD/CAM prepared human teeth was comparable. However, the performance was cement dependent .
Methods: A standard preparation (3 mm height, 6° axial convergence, 0.5 mm chamfer finish line) was designed and prepared into 144 extracted human teeth using a CAD/CAM milling machine (CEREC inLab MC XL). Based on this preparation, crowns were designed and milled out of two polymer-based CAD/CAM materials (LUX, LAV). After sandblasting the internal surface of each crown (50 μm Al2O3, 13 s) and cleaning (ethanol in ultrasonic bath, 5 min), the crowns were cemented with one of six cements (1.experimental cement, 2.RelyX Ultimate, 3.DuoCem, 4.Multilink Automix, 5.RelyX Unicem2, 6.Ketac Cem Plus), according to the manufacturers’ instructions. All crowns were seated onto the preparation, loaded under 1 kg load using a seating device and light cured for 20 s/ surface using LED curing unit.
Specimens were subjected to artificial aging by thermo-cycling (20K cycles at 5 °C-55 °C, immersion time 30 s, transfer time 10 s), 6 months of water storage at 37 °C, and cyclic fatiguing (1.2M cycles at 1.6 Hz, 49 N load). Pull-off bond strength was measured using a universal testing machine by loading specimens until failure. Failure mode was reported. Statistical analysis was performed using Mann-Whitney U tests at α=0.001.
Results: The obtained data is presented in table 1.
Conclusions: The adhesive performance of both polymer-based crown materials to CAD/CAM prepared human teeth was comparable. However, the performance was cement dependent .
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