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Observations of the bone activity adjacent to unloaded dental implants coated with Polyactive® or HA
Author(s) -
MEIJER G.J.,
RADDER A.,
DALMEIJER R.,
PUTTER C.,
BLITTERSWIJK C.A.
Publication year - 1995
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1995.tb01560.x
Subject(s) - materials science , cortical bone , bone matrix , implant , hydroxylapatite , titanium , calcification , coating , ceramic , dentistry , biomedical engineering , chemistry , composite material , anatomy , surgery , medicine , cartilage , biochemistry , pathology , metallurgy , enzyme
Summary In addition to bone‐bonding bioma‐terials such as calcium phosphate ceramics and Bioglass/glass ceramics, an elastomeric poly(ethylene oxide) poly(butylene terephthalate) (PEO/PBT) segmented block co‐polymer (Polyactive®) was recently introduced. In contrast to ceramic bioma‐terials, Polyactive® is a flexible material. In a previous three‐dimensional finite element analysis study, it was stated that application of a flexible Polyactive® coating simulates the function of the periodontal ligament. The topic of this investigation was to compare the bone‐bonding capacity of Polyactive®‐coated titanium implants with hydroxylapatite (HA) coated implants. The implants were inserted bilaterally in the edentulous part of the mandibular bone of 12 goats. After 3 weeks, the implants were in close contact with the cortical bone, but no cortical bone reaction or remodelling was observed. After 9 weeks, an extensive bone reaction was seen around the HA and Polyactive®‐coated implants and contact was frequently encountered between newly formed bone and the implants. Within the surface of the Polyactive® coating, a considerable amount of calcification was present. After 25 weeks, cortical remodelling was still apparent. A striking finding was the apparent association between osteon formation and calcification within the surface of the Polyactive® layer. Back‐scatter analysis of the non‐decalcified Polyactive® bone interface showed the presence of a calcium phosphate layer in the implant material that apparently formed a continuity with the mineral matrix of bone, suggesting bone‐bonding. In general, it was observed that the bone reactions to HA and Polyactive® were comparable. A swelling of the coating, just beneath the cortical layer (champagne‐cork effect) was often seen. This increase in volume, caused by water uptake, might result in a more intimate initial bone/Polyactive® contact, as compared with other implant materials.