Abstract
Objective
The aim of this in vitro study was to evaluate the effect of an oxide nanocoating to prevent colour degradation of maxillofacial silicone elastomers following accelerated ageing.
Material and methods
Specimens (N = 40) of specified dimensions were fabricated in Factor II room temperature vulcanizing (RTV) silicone and processed according to the manufacturer’s instructions. Two groups were classified with 20 specimens each. Specimens in the first group were coated with titanium dioxide (TiO2) by atomic layer deposition technology. The colour stability test was conducted with a UV–VIS spectrometer (Schimadzu) for both titanium dioxide nanocoated and uncoated specimen groups after subjecting them to accelerated ageing. It was analysed using the CIE L*a*b method.
Results
The average colour change was highest for uncoated specimens (2.868), and the average colour change for titanium dioxide-coated specimens was significantly low (1.774). The average colour change of uncoated specimens (2.868) was close to the acceptable threshold value (3), and that of coated specimens (1.774) was far below the acceptable threshold (3).
Conclusions
The colour change that occurred in titanium dioxide nanocoated specimens following accelerated ageing was significantly lower than that in the uncoated group, showing that the TiO2 nanocoating was effective in reducing the colour degradation of silicone elastomers.
Clinical relevance
Maxillofacial prostheses fabricated from silicone elastomers go through undesirable colour degradation over time. The development of a scientific technique that retards the colour deterioration of silicone prostheses would be of great clinical significance.
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Dr. Gopika K. K. formulated the design of the research work and drafting of the manuscript. Dr. Harsha Kumar K. was instrumental in providing guidance to design the concept of the research work and final approval of the version to be published. Dr. R. Ravichandran performed the interpretation of the data. Dr. Prasanth V. helped in the drafting and analysis of the research study. Dr. Kala S. helped in preparing the manuscript. Dr. **esh K. B. did the data acquisition and analysis.
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K. K., G., K., H.K., Ravichandran, R. et al. Effect of titanium dioxide nanocoating on the colour stability of room temperature vulcanizing maxillofacial silicone—an invitro study. Clin Oral Invest 27, 7799–7807 (2023). https://doi.org/10.1007/s00784-023-05369-5
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DOI: https://doi.org/10.1007/s00784-023-05369-5