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Figure 1. Comparison of compression and tension zones. (A) SEM of resorption cratering in a rat maxillary first molar root adjacent to a compression zone with 40 cN of orthodontic force for 5 days. (B) SEM of a rat maxillary first molar socket. Osteogenesis in response to 40 cN of orthodontic tension for 5 days can be seen as bony spicules extending into the socket from the top of the image.
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