TY - JOUR
T1 - The measurement threshold and limitations of an intra-oral scanner on polished human enamel
AU - Charalambous, Polyvios
AU - O'Toole, Saoirse
AU - Bull, Thomas
AU - Bartlett, David
AU - Austin, Rupert
N1 - Funding Information:
This project was funded via a Medical Research Council Industrial Collaborative Award in Science and Engineering (MRC-iCASE) studentship ( MR/R015643/1 ), for which GlaxoSmithKline Consumer Healthcare Oral Health Research & Development was the industrial collaborator. The funding sources were not involved in the collection, analysis and interpretation of data; in the writing of the report; or in the decision to submit the article for publication. They read the manuscript prior to submission.
Publisher Copyright:
© 2021 The Academy of Dental Materials
PY - 2021/4
Y1 - 2021/4
N2 - 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.
AB - 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.
KW - Dental Enamel
KW - Humans
KW - Surface Properties
KW - Tooth Erosion
KW - Tooth Wear
UR - http://www.scopus.com/inward/record.url?scp=85100680928&partnerID=8YFLogxK
U2 - 10.1016/j.dental.2021.01.006
DO - 10.1016/j.dental.2021.01.006
M3 - Article
C2 - 33573841
SN - 1879-0097
VL - 37
SP - 648
EP - 654
JO - Dental materials : official publication of the Academy of Dental Materials
JF - Dental materials : official publication of the Academy of Dental Materials
IS - 4
ER -