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Radial groove view. ( A ) Even the 2-mm penetration of screw 4 in radius 3 was not detectable as protruding. However, 1-mm penetrations of screws 5 and 6 were easily detected. ( B ) Concurrent 2-mm penetrations of screws 2, 4, and 8 in radius 4 were observed at the same angle as the radial groove view, but only screw 8 was seen.
