Abstract
Objectives
The study aims to investigate surface properties and microbial adhesion of various dental polymers fabricated by different manufacturing techniques before and after thermocycling.
Materials and methods
The following six materials were used to fabricate disk-shaped specimens: conventional denture polymer (Vertex Acrylic Resin, VAR), CAD/CAM denture polymer (Organic PMMA eco Pink, OP), conventional temporary polymer (Protemp™ 4, PT), CAD/CAM temporary polymer (Die Material, DM), conventional denture framework polymer (BioHPP, PB), and CAD/CAM denture framework polymer (breCAM.BioHPP, CB). The specimens were tested before and after thermocycling (5000 and 10,000 cycles, 5 °C/55 °C). Surface roughness (SR), hydrophobicity, and surface topography were determined by profilometry, water contact angle, and scanning electron microscopy (SEM). Then specimens were incubated with Staphylococcus aureus, Streptococcus mutans, and Candida albicans for 24 h, respectively. Microbial adhesion was assessed using colony-forming unit counts, XTT assay, and SEM.
Results
SR and hydrophobicity of VAR group were higher than that of OP group. S. aureus and C. albicans adhesion on VAR and PT groups were higher than that on OP and DM groups, respectively. There was no difference in surface properties and microbial adhesion between PB and CB groups. After thermocycling, SR (expect OP group) of all materials increased and hydrophobicity decreased, and the amount and activity of S. aureus and C. albicans adhesion also increased. The adhesion of S. aureus and C. albicans showed a moderate positive correlation with SR, independent of hydrophobicity.
Conclusions
CAD/CAM denture polymers and temporary polymers showed less S. aureus and C. albicans adhesion when compared to conventional ones, which were mainly affected by surface roughness, independent of hydrophobicity. Thermocycling could increase surface roughness, decrease hydrophobicity, and affect microbial adhesion of the materials.
Clinical significance
CAD/CAM dental polymers may be a better choice for the manufacture of temporary restorations and dentures to reduce microbial adhesion.
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We would like to express our sincere thanks to all those who have helped us in the course of our writing this paper.
Funding
This work was supported by Science and Technology Innovation Joint Project of Fujian Province (grant number 2018Y9103) and Startup Fund for Scientific Research, Fujian Medical University (grant number 2020QH2048).
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Conceptualization: Xia Wei, Linjuan Gao, Kun Wu, Yu Pan, Lei Jiang, Honglei Lin, Yinghui Wang, Hui Cheng; methodology: Xia Wei, Linjuan Gao, Kun Wu, Yu Pan, Lei Jiang, Honglei Lin, Yinghui Wang, Hui Cheng; formal analysis and investigation: Xia Wei, Linjuan Gao, Kun Wu; writing — review and editing: Xia Wei, Yu Pan; funding acquisition: Xia Wei, Hui Cheng; supervision: Yu Pan, Lei Jiang, Honglei Lin, Yinghui Wang, Hui Cheng.
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Wei, X., Gao, L., Wu, K. et al. In vitro study of surface properties and microbial adhesion of various dental polymers fabricated by different manufacturing techniques after thermocycling. Clin Oral Invest 26, 7287–7297 (2022). https://doi.org/10.1007/s00784-022-04689-2
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DOI: https://doi.org/10.1007/s00784-022-04689-2