Title: 1294 - A Comparison of Different Methods for Vertical Wear Measurements of Dental Ceramic


Nader Abdulhameed (Presenter)
University Of Florida

ShuMin Hsu, University of Florida
Arthur Clark, College of Dentistry, U of Fl
Fan Ren, University of Florida
Josephine Esquivel-Upshaw, University of Florida


Objectives: The aim of this study was to test the hypothesis that there is no significant difference in the measurement of vertical height loss between different methods and devices used for measuring wear in dental ceramic.

Methods: Two ceramic disks (ZirPress, Ivoclar Vivadent) (12 mm x2 mm) were polished to 0.5 ┬Ám and subjected to five different chewing simulator cycles 800, 1600, 3200, 6400, and 25000 to generate a total of ten wear facets. Disk facets were reproduced with impression materials (Virtual, Ivoclar Vivadent and Affinis Dcode, Coltene). A stylus profilometer (Tencor, KLA-Tencor) with a depth resolution of 50 nm was used as a gold standard to measure vertical loss directly on the ceramic using six lines of measurements in the x and y axis to obtain the deepest point. Measurements obtained from the profilometer were compared with measurements from LAS-20 (red laser scanner, LAS-20, SD Mechatronik) [LAS] and True definition (blue laser scanner, True Definition, 3M) [TD]. Geomagic (Geomagic control 2014, Geomagic) software was used to obtain deepest point measurements from STL files from LAS and TD. A factorial design with eight different subgroups included the techniques used to obtain the data; direct measurements from the ceramic [C] discs, impression [I], scannable impression [DI], and ceramic specimens with spray [S].

Results: A significant difference (P<0.0001) was detected between all tested groups. There was no significant difference (P>0.9) between CP, IP, DIP and CTD groups. For the three devices used, there is no significant difference (P>0.9) between stylus profilometer and TD. However, significant difference (P<0.0001) was obtained between these devices and LAS. There were significant differences (P=0.03) within the LAS subgroups CLAS, DLAS and ILAS.

Conclusions: True Definition scanner demonstrated high accuracy comparable to the stylus profilometer while the LAS-20 showed differences in measurement.

This abstract is based on research that was funded entirely or partially by an outside source:
NIH-NIDCR R01-DE025001

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE

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