such lack of information prevents us from drawing general conclusions .It is not even know how bending or a fracture of the titanium or ceramic implant will affect the outcome of treatment. Other unknown factors are how this new trauma will affect the cost of treatment and the type of therapy in the future. Allen and Allen showed in case that the force applied to the implant probably results in bone fracture,which in potentially a very serious outcome of trauma to an implant.Flanagan showed in another case that the impact force caused no apparent damage to the bone,the implant or its components except abutment screw loosening. Prevention of trauma to implants would seem to be important as the consequences of such injuries are not well known and the costs are likely to be high.