Abstract
Purpose: The aim of this study was to investigate the effect of oxygen plasma treatment on the tensile bond strength of a silicone-based soft liner to a thermocycled denture base. Methods: 2 10×10×1 mm heat-polymerized acrylic resin blocks for X-ray photoelectron spectroscopy (XPS) analysis were prepared (one served as control, and another treated by oxygen plasma for 4 min). 30 (10×10×1 mm) acrylic resin blocks for contact angle measurement and 80 (8×10×30 mm) for tensile test were also prepared and equally divided into five groups: a control group and four experimental groups (exposure to oxygen plasma for 1min, 2 min, 3 min and 4 min, respectively). All blocks were thermocycled (5-55°C, 5000 cycles) before oxygen plasma treatment. After oxygen plasma treatment, the soft liner was processed between two blocks according to manufacturer’s instructions and polymerized. All specimens were submitted to a tensile test using a universal testing machine and results were statistically analyzed (ANOVA, p<0.05, Tukey’s HSD test). Results: The XPS analysis showed that the O/C ratio increased from 0.324 for the control group to 0.498 for the 4-min exposure group. With regard to water contact angle, the lowest value was obtained from the 4-min exposure group (37.32°). For the tensile test, the highest tensile bond strength was observed in the 4-min exposure group (1.998 ± 0.110 MPa) and the lowest was in the control group (0.831 ± 0.059 MPa). Conclusions: Oxygen plasma treatment was efficient in improving the tensile bond strength between siliconebased soft denture liner and thermocycled denture base.
Highlights
The loss of natural teeth may result in psychosocial problems and inability for patients to perform functions
2 blocks (10×10×1 mm) for X-ray photoelectron spectroscopy (XPS) analysis and 30 blocks (10×10×1 mm) for water contact angle measurement were prepared
Significant change occurred in the 4 min exposure group when compared with the control group
Summary
The loss of natural teeth may result in psychosocial problems and inability for patients to perform functions. These problems can be corrected with the placement of removable dentures. Some patients are not able to withstand the forces transmitted by denture bases because of sharp alveolar ridge, atrophied ridge, and thin atrophic mucosa. Resilient denture liners are used to cushion the inner surface of removable dentures, helping to evenly distribute mastication forces, preventing trauma of sensitive mucosa, enhancing denture retention by engaging undercuts [1,2]. The use of siliconebased resilient denture liner in mandibular complete dentures resulted in significant improvements in their satisfaction ratings compared with conventional heat-activated acrylic resin [3]. Soft acrylic compounds often contain plasticizers which may leach out of the compounds with time
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