The Screw in my Dental Implant Has Broken Twice, What's Causing This?

Dental implants are designed with safety factors in place.  The screw connecting the implant to the restoration is that safety factor.  If there is too much stress placed on the implant, the screw may fail, preventing further damage to the implant and surrounding supporting structures.  Since this has happened before, there may be too much stress placed on the implant.  I recommend having the implant evaluated for possible options to better distribute the forces involved.

The only real reason for multiple screw breakageson the same implant is poor distribution of occlusal forces. In laymans terms this means too much stress (most likley lateral) is being placed on that tooth whenyou chew.  The bite on this tooth needs to be adjusted by your dentist otherwise the implant may fail in the future

This can be a result of several things:

1) Your bite

2) The type and size of the implant

3) The location of the implant in relation to size

If it is bite related there may be some abnormal stresses placed on the implant.  If the implant is small and is in the back of the mouth, there may be too much "load" on this implant. Finally, the type of implant may have something to do with it too.  Talk to your dentist about these factors.  

Overall, implants can be highly successful and provide a great service.

Ronald W. Konig DDS, FAGD, LVIF

Usually these fractures are due to a lot of stress on the crown itself. The best approach is to revisit your whole bit design and relieve the tension on the implant.

All the doctors before me listed all posible reasons why your implant screw is breaking. It looks like there is a problem in biomechanical level. My suggestion is to find an implant prosthodontist ( specialist who specislizes in restoring implants) and I am sure your problem will be solved. Another hint, why don't you suggest your doctor to go from screw retained restoration to cement retained.

Good luck!