Mechanical properties of implant position and crown root ratio?

i wouldn't be worried about the mesial inclination as a custom abutment will correct this. Whilst it's not ideal it's not a catastrophic failure. However I would strongly recommend a sequential bone training regime. Feel free to email me, if you would like my bone training regime. I wouldn't wait 6 months but begin bone training at 3 months. This will work out just fine.

Good healing. I would proceed with using a custom made abutment and possible occlusion rests from restoration on the adjacent teeth to lower mastication loading.

Not to worry , you are not the first and will not be the last that this happens to when placing into the inter-radicular Bone . It has happened to us all , as for low torque and so called "poor " bone , not to worry by merely placing the Implant into the site you have up-regulated the host healing response and when you load you will you do the same again ( See Sasaki , in JOMI ) , so integration will not be an issue and can be checked with Osstell if concerned . As to length yes maybe a mm or or would have been better , but again we all do that in the new modern more medico-legal world and yes there is lots of evidence to support shorter implants . Peter

First of all - Short implants do work - i suggest to look at this https://www.youtube.com/watch?v=hWY1FnAa8UY Crown implant ratio - at prosthetic point of view, even if you deal with teeth, you have a protecting teeth - neghbouring teeth, you have like a single tooth restoration. crown implant ratio is not a problem, just deal with lateral forces and you will be okay. also implant surfaces are going to facilitate osseointegration, so about bone training, at biological point of view - if you do not use GBR, you can start bone training after 6 weeks (look at bone healing times in hystology book or something like that) just check for fixed gingiva, because many times i find no fixes gingiva in this region. and i do agree, that if you will be able to screw a transfer, you will be able to fit an abutment, just use custom made.

Why do you think the bone was so soft after seven months? Was any grafting done? I occasionally get these little surprises of soft bone in post extraction areas really tough to fix. I might have gone a bit deeper to pick up some of the nascent bone but the soft bone concerns me more than the implant size, hope it heals for you, keep us posted.

I would like to know more about "bone training"

I'm not concerned about the angulation of the implant. The laboratory of doctor can prep am angled stock abutment or a custom milled abutment will work nicely. A Quantum or Bicon implant would of been a superior choice in this situation. The Quantum and Bicon short implants will give one the requisite BIC without the risk of injuring the IAN. I strongly suggest one considering them in areas where there is a risk of nerve injury.