IADR Abstract Archives
Bonding Methods Effect on the Shear-Bond Strength of Artificial Teeth to Denture Base Materials
Objectives: To investigate the effect of using chemically polymerized luting acrylic resins on the shear-bond strength between acrylic resin artificial teeth and denture base materials (DBM). Also, the effects of increased packing pressure prior to polymerization of DBM and different surface treatments on the shear bond strength (SBS).
Methods: Three heat-polymerizing DBM were tested: Impact 2000 (Harry J. Bosworth), Lucitone 199 (DENTSPLY), and Premium Denture Base (Patterson Dental). One artificial teeth material was tested Portrait IPN (DENTSPLY). Denture base specimens were circular and measured 16 × 2 mm while artificial tooth specimens were cylindrical and measured 3mm x 3.3 in width (N=10/group). Two different bonding methods were used: heat-polymerized DBM were processed against the artificial tooth specimens directly (Heat), and auto-polymerized acrylic resin was used as a luting material (Auto). Two different pressures were applied to each denture base material prior to polymerization: conventional (Conv.), 3,500 psi and high pressure (HP), 24,462 psi, with three surface conditions of the bonded surfaces: No surface treatments (NO), airborne particle abrasion (Airborne) and acrylic resin primer application (Primer). After the artificial teeth were bonded to the denture bases, the shear-bond strength test was conducted using Instron machine. Data were analyzed using ANOVA and multiple comparison tests.
Results: Mean SBS values are displayed in the histograms (attached image)
Two-way ANOVA indicated a significant difference in the SBS between the 2 bonding methods and among the 3 materials. The conventional heat-polymerized group recorded significantly higher SBS for the 3 tested resins (P<0.0001).
Conclusions: Heat-polymerized group recorded significantly higher SBS than the auto-polymerized groups (p<0.0001). Increasing the packing pressure prior to polymerization of DBM can significantly decrease SBS to the artificial teeth when chemically polymerized luting resins were used, regardless of different surface treatments.
Methods: Three heat-polymerizing DBM were tested: Impact 2000 (Harry J. Bosworth), Lucitone 199 (DENTSPLY), and Premium Denture Base (Patterson Dental). One artificial teeth material was tested Portrait IPN (DENTSPLY). Denture base specimens were circular and measured 16 × 2 mm while artificial tooth specimens were cylindrical and measured 3mm x 3.3 in width (N=10/group). Two different bonding methods were used: heat-polymerized DBM were processed against the artificial tooth specimens directly (Heat), and auto-polymerized acrylic resin was used as a luting material (Auto). Two different pressures were applied to each denture base material prior to polymerization: conventional (Conv.), 3,500 psi and high pressure (HP), 24,462 psi, with three surface conditions of the bonded surfaces: No surface treatments (NO), airborne particle abrasion (Airborne) and acrylic resin primer application (Primer). After the artificial teeth were bonded to the denture bases, the shear-bond strength test was conducted using Instron machine. Data were analyzed using ANOVA and multiple comparison tests.
Results: Mean SBS values are displayed in the histograms (attached image)
Two-way ANOVA indicated a significant difference in the SBS between the 2 bonding methods and among the 3 materials. The conventional heat-polymerized group recorded significantly higher SBS for the 3 tested resins (P<0.0001).
Conclusions: Heat-polymerized group recorded significantly higher SBS than the auto-polymerized groups (p<0.0001). Increasing the packing pressure prior to polymerization of DBM can significantly decrease SBS to the artificial teeth when chemically polymerized luting resins were used, regardless of different surface treatments.
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