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Dentin Erosion Simulation by Cantilever Beam Fatigue and pH Change

¹ UCSF School of Dentistry, Box 0758, San Francisco, CA 94143, USA;
² Materials Sciences Division, Lawrence Berkeley National Laboratory, CA, USA;
³ Division of Biostatistics, UCSF School of Medicine, San Francisco, CA, USA;

View larger version (16K): [in a new window]   Figure 1. Schematic illustrations of (a) the location in the tooth from which the beam was prepared (E = enamel, D = dentin, B = beam), and (b) the cantilever beam geometry used for in vitro fatigue testing. Each dentin beam tested included some root dentin and some coronal dentin. Testing was conducted at ambient temperature. The locations where the measurements were made are indicated (C = clamp, H = high stress, BP = before plunger, UP = under plunger) for the top (T), side (S), and bottom (B) surfaces.

View larger version (89K): [in a new window]   Figure 2. Optical micrograph showing the surface of a typical specimen near the high-stress area after fatigue-cycling at pH = 6. The surface loss is greatest near the clamp and decreases gradually toward the low-stress area, without any apparent localized notching. The arrow shows the location of the edge of the clamp (C = clamp, H = high stress).