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  • Title: A comparison of two-dimensional and three-dimensional measurements of wear in a laboratory investigation.
    Author: Rodriguez JM, Bartlett DW.
    Journal: Dent Mater; 2010 Oct; 26(10):e221-5. PubMed ID: 20701961.
    Abstract:
    OBJECTIVES: The aim of this research was to compare two-dimensional (2D) and three-dimensional (3D) tooth measuring techniques after subjecting enamel samples to tooth wear in vitro on an erosion-abrasion model. METHOD: 80 polished mid-coronal enamel sections were subjected to 10 wear cycles. Each cycle consisted of remineralization for 2 h in artificial saliva, followed by 10 min immersion in one of four acidic fruit drinks or distilled water and finally toothbrush abrasion with a non-fluoridated tooth paste. The resulting wear scars were measured using 2D and 3D techniques using surface matching software. RESULTS: The 2D step heights measurements from the exposure to the four acidic drinks showed no statistically significant differences (median wear range=22.4-32.5 microm) between them (p=0.99) but there were differences with distilled water (median wear=10.0 microm) (p=0.01). The 3D measurements showed that two drinks produced more wear compared to the others and water when the whole surface and volume exposed to wear was accounted for (p=0.01). SIGNIFICANCE: The difference in data from the two techniques showed that 3D measurements gave a more accurate assessment of the impact of the wear regime.
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