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Effect of RW niche drilling on performance with the AMEI placed on the RW measured in ΔHEV. Positive ΔHEV indicate that niche drilling outperforms the intact niche condition. Negative ΔHEV indicate that the intact niche outperforms the drilled niche. a 1-mm ball tip with and without drilling the RW niche. b 0.5-mm ball tip with and without drilling the RW niche.
