Prosthetic rehabilitation of missing structures in the oral and
maxillofacial region in accordance with devan & principle of
preservation has been the ultimate challenge to the prosthodontist. This
direct structural and functional connection between living bone and
implant surface termed as osseointegration, was first described by
Brånemark 1977 and has undoubtedly been one of the most significant
scientific breakthroughs in dentistry over the past 30 years.Thus a
close contact of bone and implants at the cellular level is a
prerequisite for successful long term implant supported prosthetic
function. The close approximation of bone and threaded implants must
allow transmission of forces with little relative displacement of bone
and implants, even in the absence of adhesive bonds between them.