Thinking about explanation. If I have BII isn't it necessary for the total capsulectomy or will explantation be ok?

Typically if you are having no issues with the implants or capsules, it is fine to remove only the implants and leave the capsules behind.  However if you are concerned that you may be experiencing health issues due to the implants I would recommend removing both the capsules and implants for your peace of mind.

Since
you implants were under the muscle, the posterior capsule is firmly attached to
the underlying ribs.  If the capsule is
very thin and not infected, the capsule can remain.  Attempting to remove capsules can result in
bleeding and injury to the underlying muscle, ribs and possible pneumothorax, although
it is very rare.  The surgeon will decide
what is necessary.  The other thing to
think about after explantation is the excess skin.  You will probably need a lift and the
technique I recommend is The Bellesoma Method. 
This technique reshapes your breast tissue creating upper pole fullness
without implants, elevates them higher on the chest wall and more medial to
increase your cleavage.  Vertical scars
are avoided, nipple sensation and the ability to breast feed are maintained if
not injured during your previous surgery. 
Simple explantation can be done under local anesthesia but capsulectomy
and lift will require general anesthesia. 
Best Wishes,Gary Horndeski, M.D.

Thank you for the question.  Generally speaking (in my opinion), unless the breast implant capsules have thickened (and/or are otherwise symptomatic), are associated with the ruptured silicone gel breast implants, or if the patient has concerns about "medical conditions" related to the breast implants, capsulectomy is not universally necessary. For these patients, en bloc removal of breast implants is a good procedure.

On the contrary, capsulectomy can expose patients to additional risks, such as bleeding, size loss, contour irregularities and other serious complications. In other words, any maneuver performed during surgery exposes patients to additional risk (morbidity). For example, attempting to remove very thin capsule densely adherent to the patient's rib cage may expose the patient to significant bleeding and/or entrance into the thoracic cavity.

My best advice: select your plastic surgeon carefully. Make sure that he/she has significant experience achieving the types of outcomes you will be pleased with. Then, communicate your goals carefully, as well. Working together you will come up with a good plan to achieve your goals.  

  I hope this helps. Best wishes.