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Crack depth measured from top of tooth to maximum penetration, for nominal tooth of base radius R = 5 mm, height H = 7.5 mm and enamel thickness d = 1.5 mm, for number of cusps n = 1, 2, 3, 4 and 5. L denotes longitudinal crack in enamel. Vertical apex loading on (a) one cusp, (b) all cusps. Note insensitivity of crack size to n in (a), but not in (b).
