Abstract
This study investigated the impact of different light curing units (LCUs) for the polymerization of adhesive system visio.link (VL) on the tensile bond strength (TBS) of different PEEK compositions. For TBS measurements, 216 PEEK specimens with varying amounts of TiO2 (PEEK/0%, PEEK/20%, PEEK/>30%) were embedded, polished, air abraded (Al2O3, 50 µm, 0.4 MPa), conditioned using VL, and polymerized using either a halogen LCU (HAL-LCU) or a LED LCU (LED-LCU) for chairside or labside application, respectively. After thermocycling (5000×, 5/55 °C), TBS was measured, and fracture types were determined. Data was analyzed using a 2-way ANOVA followed by Tukey–HSD, Kruskal–Wallis H and Mann–Whitney U tests as well as a Chi2-test and a Ciba–Geigy table (p < 0.05). Globally, the light curing units, followed by PEEK composition, was shown to have the highest impact on TBS. The HAL-LCUs, compared to the LED-LCUs, resulted in a higher TBS for all PEEK compositions—without significant differences between chairside and labside units. Regarding the different PEEK compositions, PEEK/20%, compared to PEEK/0%, resulted in a higher TBS when both, HAL-LCUs or LED-LCUs were used for labside application. In comparison with PEEK/>30%, PEEK/20% resulted in a higher TBS after using HAL-LCU for labside application. No significant differences were found between PEEK/0% and PEEK/>30%. HAL-LCU with PEEK/20% for labside application showed a higher TBS than HAL-LCU with PEEK/20% for chairside application, whereas LED-LCU with PEEK/>30% for chairside application showed a higher TBS than LED-LCU with PEEK/>30% for labside application.
Highlights
In dentistry, polyetheretherketone (PEEK) is one of the most frequently used high-performance thermoplastic [1]
Since the light curing units for the polymerization of adhesive systems as well as the varying compositions of PEEK material are possible parameters that may influence bonding properties, this study investigated the null hypotheses that neither different PEEK compositions (PEEK/0%, PEEK/20%, and PEEK/>30%) nor the application of different light curing units (LED-LCUs and halogen LCU (HAL-LCU) designed for either chairside or labside application) affect bonding properties with respect to the adhesive system visio.link
This study investigated the impact of four different light curing units (LCUs) on the effectiveness of the adhesive system visio.link as a surface conditioner for three different PEEK compositions with varying filler amounts of TiO2 (PEEK/0%, PEEK/20%, PEEK/
Summary
Polyetheretherketone (PEEK) is one of the most frequently used high-performance thermoplastic [1]. TiO2 is already known for different applications in dentistry, and, similar to PEEK, it is proven to be biocompatible. Adding TiO2 as inorganic filler particles satisfies the optical properties for dental applications with PEEK and endorses extending the range of indications. For this reason, many studies have investigated the material regarding the relevant properties, e.g., wear resistance [6], fracture load [7,8,9], retention load and retention forces [10,11], hardness [12], flexural behavior [13], and discoloration [14]. PEEK has been proven to be a suitable material for fixed dental prostheses (FDPs) [15,16,17] and long-term restorations [4,6,10,11,12,13,18]
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