My Mom was referred to Dr. Mastrovich by her dentist to remove a broken implant abutment and abutment screw. This is an extremely difficult case, but Dr. Mastrovich was able to remove the broken abutment and abutment screw — carefully keeping the implant intact. My Mom says she felt very comfortable in the chair. She was so happy and relieved that she asked me to write this review. Thank you Dr. Mastrovich!