The measurement threshold and limitations of an intra-oral scanner on polished human enamel
| Autor: | Saoirse O'Toole, Rupert Austin, David Bartlett, Polyvios Charalambous, Thomas G. Bull |
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| Rok vydání: | 2020 |
| Předmět: |
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Materials science Microscope Surface Properties Microscope slide 02 engineering and technology Surface finish law.invention 03 medical and health sciences 0302 clinical medicine law Surface roughness Humans General Materials Science Tooth Erosion Dental Enamel General Dentistry Enamel paint 030206 dentistry 021001 nanoscience & nanotechnology Metrology stomatognathic diseases Mechanics of Materials visual_art visual_art.visual_art_medium Particle size Tooth Wear 0210 nano-technology Biomedical engineering |
| Zdroj: | Dental materials : official publication of the Academy of Dental Materials. 37(4) |
| ISSN: | 1879-0097 |
| Popis: | Objective To investigate the measurement threshold of an intra-oral scanner (IOS) on polished human enamel. Methods The optical performance of an IOS was compared to a gold-standard non contacting laser profilometer (NCLP), on a painted microscope slide, compared to increasing particle size of silicon-carbide papers (21.8–269.0 μm) and separately on polished human enamel with increasing step-heights. The enamel samples were randomised (n = 80) and scanned using the IOS and NCLP at increasing step-height depths (μm) (1.87–86.46 μm) and quantified according to ISO:5436-1. The measurement threshold of the IOS was determined using a custom designed automated lesion localisation algorithm, corroborated by Gaussian skewness (Ssk) and kurtosis (Sku) analysis, to assess the minimum step-height measured on each enamel sample. Results The NCLP showed statistically increased Sq surface roughness for all silicon carbide particle sizes compared to the microscope slide, whereas, the IOS Sq roughness discriminated silicon-carbide particles above 68.0 μm compared to the glass slide (p ≤ 0.02). On polished enamel, the automated minimum detectable step-height measurable on each sample was 44 μm. No statistically significantly different step-height enamel lesion measurements were observed between NCLP and IOS above this threshold (p > 0.05). Significance This study revealed the fundamental optical metrological parameters for the IOS, was step-heights above 44 μm and this reflects the data acquisition of the system. These results highlight the limitations of IOS used in this study, mandating further research to optimise the performance of other IOS systems, for measuring wear of materials or tooth wear on human unpolished natural enamel surfaces. |
| Databáze: | OpenAIRE |
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