Depending on the type and age of your implant, the likelihood of rupture during a car accident is low. There is a difference between the capsule rupturing and the implant shell rupturing. If you are concerned, you should see a plastic surgeon. an ultrasound or MRI may be ordered if the trauma to the area was significant.
Thank you for your question. If you have suffered a seat belt injury in a car accident it is important that you see your plastic surgeon for an examination. The concern is rupture of your breast implant and and MRI is necessary for diagnosis.