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The abutment and the implant act as a mesh (framework) so that bone graft and collagen membrane can be laid upon them buccolingually. When the flaps are sutured, there is less tension than that without the abutment. Furthermore, the buccal tissue volume seems to be increased (Fig.5 (<: fistula, which should heal soon), as compared to Fig.1). Screw tends to loosen and food impaction is likely when the implant trajectory is off.
Xin Wei, DDS, PhD, MS 1st edition 12/06/2016, last revision 04/12/2020