Why To Bury Implant?

Why to decorticate? (Got it from website, but I understand what they are saying.)
1. The biologic rationale for decortication of bone is to allow progenitor cells easy access to bone graft site and to facilitate prompt angiogenesis. 
2. It also may enhance the physical connection between a bone graft and a recipient site.
Why to bury implant?
1. Patient's opposing tooth is supraerupted. There are not enough space for healing abutment. 
2. submerged implant (5.3x10 mm) is placed with insertion torque approximately 35 Ncm, I think for 35 Ncm, it is safer to close the incision. For Tapered implant we reached more than 60 Ncm most of the time, and they never fall out. Doctor Wei, do you think if we close the incision to bury the implant for Miss shi (tooth 13), then there would be less chance for the implant to fall out? I remember her implant was placed 35Ncm, and we placed healing abutment immediately.
3.  The buccal microthreads are exposed, it is better to close the incision to let the new bone to grow around it.(I guess)  Jenny Sheets

Jenny: It is excellent research, thinking and observation.  Miss Shi's implant is a little too small and too short to hold a healing abutment.  Gravity is also against us. Her oral hygiene is poor.  I do learn the lesson from it.  Thanks.

Hi! Dr. Wei , this may be the reason that I think.
                 Why the buccal plate had to decorticate ?
                 This is done for the regenerative procedures which have been utilized to restore lost alveolar bone. And also that the graft- and/or membrane-regenerated bone has the ability to support implants. In an attempt to minimize alveolar ridge deformities. Finally, this step helps in great loss of buccal plate and helps the implant to be in place.
Please, correct me if I am wrong.
Thank you!
Regards,
Suniti....

Suniti:  I really appreciate your effort.  Please read what Jenny wrote for reference.  Thanks again. 

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Xin Wei, DDS, PhD, MS 1st edition 04/06/2013, last revision 04/06/2014