Machined Collar Implants

Dr. Aggar asks:
My periodontist has recommended using a dental implant fixture with a
machined (smooth) collar in patients who have chronic periodontal
disease.

He says these will work better than dental implant fixtures which have a surface coating up to the platform. This seems to be true in cases where there is periodontal disease. Are any of you making this distinction and treatment planning this way? What has been your experience?

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