Shu-Min Hsu1, Fan Ren2, Nader Abdulhameed1, Mijin Kim1, Dan Neal3, Josephine Esquivel-Upshaw1. 1. Department of Restorative Dental Sciences, University of Florida College of Dentistry, Gainesville, Florida. 2. Department of Chemical Engineering, University of Florida College of Engineering, Gainesville, Florida. 3. Department of Neurosurgery, University of Florida College of Medicine, Gainesville, Florida.
Abstract
OBJECTIVES: The aims of this study were to test the hypotheses that (a) a laserscanner used for measuring maximum depth and volume loss will yield the same results as a surface profilometer; (b) the surface roughness will affect the maximum depth and volume loss measured with the laserscanner; (c) analytical results using the laserscanner from multiple operators have no more than 10% inter-rater difference and; (d) replicating samples using either stone or impression material is an accurate method for measuring wear using the laserscanner. MATERIALS AND METHODS: The volume and maximum depth of indentations from fine, medium and rough burs on glass-ceramic disks were measured using two devices, a surface profilometer (Dektak II, Veeco) and a 3D Laserscanner (LAS-20, SD Mechatronik). Replicates of the indentations made from polyvinysiloxane impression material and gypsum were also measured. RESULTS: Comparison of profilometer and laserscanner readings using ceramic disks demonstrated a mean error of 13.61% for depth and 25.32% for volume. Replication errors were minimal (2.6% for impression, 2.5% for stone). Surface profilometer data for volume measurements revealed a difference of 6.1% for impression and 6.5% for stone compared with ceramics. However, when measurements for replicates were compared between laserscanner and surface profilometer, depth had a mean error of 74% for impression and 51% for stone. Volume differences of 78% for impression and 44% for stone were recorded. CONCLUSION: This work demonstrated that the laserscanner was a convenient device for measuring wear but there is a need to validate the accuracy of the measurements.
OBJECTIVES: The aims of this study were to test the hypotheses that (a) a laserscanner used for measuring maximum depth and volume loss will yield the same results as a surface profilometer; (b) the surface roughness will affect the maximum depth and volume loss measured with the laserscanner; (c) analytical results using the laserscanner from multiple operators have no more than 10% inter-rater difference and; (d) replicating samples using either stone or impression material is an accurate method for measuring wear using the laserscanner. MATERIALS AND METHODS: The volume and maximum depth of indentations from fine, medium and rough burs on glass-ceramic disks were measured using two devices, a surface profilometer (Dektak II, Veeco) and a 3D Laserscanner (LAS-20, SD Mechatronik). Replicates of the indentations made from polyvinysiloxane impression material and gypsum were also measured. RESULTS: Comparison of profilometer and laserscanner readings using ceramic disks demonstrated a mean error of 13.61% for depth and 25.32% for volume. Replication errors were minimal (2.6% for impression, 2.5% for stone). Surface profilometer data for volume measurements revealed a difference of 6.1% for impression and 6.5% for stone compared with ceramics. However, when measurements for replicates were compared between laserscanner and surface profilometer, depth had a mean error of 74% for impression and 51% for stone. Volume differences of 78% for impression and 44% for stone were recorded. CONCLUSION: This work demonstrated that the laserscanner was a convenient device for measuring wear but there is a need to validate the accuracy of the measurements.
Authors: Paul Lambrechts; Elke Debels; Kirsten Van Landuyt; Marleen Peumans; Bart Van Meerbeek Journal: Dent Mater Date: 2006-05-18 Impact factor: 5.304
Authors: Josephine F Esquivel-Upshaw; Shu-Min Hsu; Ana C Bohórquez; Nader Abdulhameed; Gary W Scheiffele; Mijin Kim; Dan Neal; John Chai; Fan Ren Journal: Clin Exp Dent Res Date: 2020-09-21