3D surface roughness of a partial free form dental surface after enamel loss due to acidic erosion using optical and X-Ray CT metrology

Abstract

A partial human natural unprocessed dental sample was submerged in Citric Acid (0.3% pH.3.2), for 1 hour, without agitation, over a selected region (diameter 1.5 mm). The sample was measured using the TaiCaan XYRIS 2020 H
instrument “before and after” the test and measured using X-Ray CT (XCT) in the “after” condition, for direct comparison with the optical measurement. The analysis of the sample was conducted using a 80 µm 3D gaussian filter
to remove the surface form while maintaining the surface roughness. The 3 surfaces were compared and co-located to allow comparison of 3D surface roughness (Sa). A square region (0.6 x 0.6 mm) of the surface is segmented into 16 measurement regions (0.15 x 0.15 mm) and the roughness of each region compared. Results demonstrate that the “after” optical measurement shows a reduction of surface roughness proportional to the initial roughness of the
surface. A comparison with the “after” XCT indicates a similar result to the optical data with a further reduction in roughness values when compared to the optical. We show that XCT generated surface data can be used to measure
the surface changes on free form surfaces.

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Identifiers

ORCID for John McBride: orcid.org/0000-0002-3024-0326

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