Retrograde Peri-Implantitis
It has been described by Misch as implant failure probably due to bone microfractures caused by premature implant loading or overloading, other forms of trauma or occlusal factors.
The suggested mechanism is that once the biomechanical demand has exceeded the load bearing ability of bone, microfractures of the bone at the implant interface may occur; they may also occur if microdamages accumulate faster than they can be repaired, a fatigue fracture at the bone implant interface may result.
Other Reasons for causing Periapical lesions around bone - (Retrograde) - include:
- Bacterial involvement resulting from placement of implant in infected socket.
- Infection from the adjacent natural tooth - cross infection