- Greater upkeep: TRMs generally need much more diligent cleaning than MADs due to their unique style and design. Gentle tissue reflection: An incision is made over the crest of bone, splitting the thicker connected gingiva around in 50 % so that the ultimate implant could have a thick band https://clear-aligners.tblogz.com/the-greatest-guide-to-crown-and-bridge-46684632