Professor Bollen is a Belgian specialist in periodontology and implant dentistry. He is a part-time professor at the College of Medicine & Dentistry, Ulster university, Birmingham.
He installed and restored more then 12,000 implants during his 25 year clinical career. He is a world-wide authority in the fields of ulta-short dental implants and ceramic dental implants. Prof. Bollen published more then 50 international articles and is editor-in-chief of several on-line dental journals.