Histologic evaluation of a P.B.R. implant system: study in man

Objectives: The aim of this study was to obtain immediate bone reparation in only 6 wks, and to predict primary bone apposition without intermediate growth of the connective tissue.

Methods: We inserted 128 PBR (Primary Bone Reparation) implants (TMI^® Pressing Dental, RSM) into 42 patients of both genders, aged between 29 and 68 yrs. After 45 days, 25 implants were removed from their sites, carefully chosen so as not to endanger either the final prosthesis plan or the patient's health. The removed samples were embedded in resin (Tecnovit Kulzer), histologically prepared (EXAKT), and stained with hematoxylin/ eosin and methylene blue. The same samples were then examined histologically under an optical microscope (Zeiss and Leitz) at 50-100-200-400X.

Results: The quantity and the quality of the bone observed histologically in connection with the radicular titanium prostheses, following PBR, registered complete growth. The BIC (Bone Implant Contact), measured all around the removed implants, averaged 85%. Further, there were no necrotic zones associated with the resorption or substitution with connective fibrous tissue.

Conclusions: Our histologic analysis demonstrates that the PBR implant system is, without doubt, reliable. Actually, it permits a great deal of bone to support the progressive load of dental prostheses.