horrible horrible horrible!!! ruined my dental implant and said nothing to me that he stripped the screw. just said couldn't fix it and wanted me to go to the dentist who put it in. my dentist is unable to this mess and needs to cut the crown and screw and try to remove the rest of screw from the implant and start all over again. the dentist also had bad breath!! i have two dentist and an oral surgeon who will attest to the fact that this guy had absolutely no business working on anyone's expensive dental work!! I would rate him a zero but this system will not let me!!