An investigation into the use of a CAD/CAM mould to improve the dimensional consistency of samples.
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Objective: The aim of this study is to identify if the use of a CAD/CAM mould can improve the dimensional consistency of the ceramic portion of metal-ceramic test samples. Materials and Method: A total of 30 metal-ceramic samples were fabricated from CoCr DG1 alloy and VITA VMK 95 dentine. Split into two groups of 15; Samples within Group 1 had porcelain applied by hand following ISO 9693-1 specification, whereas, samples within Group 2 had porcelain applied through the use of a specially made CAD/CAM mould. Once all samples had been fully fabricated, length, width, and thickness measurements were taken from the porcelain section of each sample and the results were analysed. Results: Statistical analysis in the form of an unpaired t-test was utilised to analyse the results. The results indicated a difference in terms of length consistency between the two groups, with a p-value (< 0.05) of 0.007319. However, an insignificant difference was calculated from the width and thickness measurements taken from both groups, with p-values (< 0.05) of 0.806903 and 0.855302. All Group 1 samples had a higher standard deviation value in terms of length, width, and thickness measurements. Conclusion: Results from this study reject the null hypothesis, as the ceramic section of samples which were fabricated through the use of a CAD/CAM mould were dimensionally more consistent than samples which had porcelain applied by hand following ISO 9693-1 specification. However, Group 1 samples were more accurate to the dimensions specified within ISO 9693-1.
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