Behavior of the bone-titanium interface after push-in testing: a morphological study.
Fourteen titanium dental implants (Tioblast) were implanted singly in the proximal tibia of New Zealand rabbits for 120 days. A bone defect was surgically produced and filled with Bio-Oss around six of these implants. After the animals were sacrificed and their organs harvested, bone segments were fixed and methacrylate embedded after the push-in test had been performed. Microradiography was performed on longitudinal sections of the implants, whereas scanning electron microscope analysis was performed on the remaining embedded half-implants using secondary electrons only. The results showed that the implants were apically and coronally surrounded by bone, whether Bio-Oss was used or not. Fractures were evident through the newly formed bone and between the pre-existing and newly formed bone. Some fracture lines propagated through the bone and stopped at the implant surface without continuing along the bone-titanium interface. Detachment between the implant and the bone occurred at the coronal extremity of the implants and along its cervical region. These results highlight the fact that the bone-titanium interface has a high resistance to loading. It exhibited greater resistance than the newly formed bone and seems to behave in a manner similar to the cement lines of osteons.
Zaffe
Davide
D
Department of Anatomy and Histology, Human Anatomy Section, University of Modena and Reggio Emilia, Italy. zaffe@unimo.it
Rodriguez Y Baena
Ruggero
R
Rizzo
Silvana
S
Brusotti
Cesare
C
Soncini
Monica
M
Pietrabissa
Riccardo
R
Cavani
Francesco
F
Quaglini
Virginio
V
D000818:Animals; D001345:Autoradiography; D001842:Bone and Bones / Q000502:physiology*; D015921:Dental Implants; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D011817:Rabbits; D013499:Surface Properties; D013977:Tibia; D016707:Tissue Fixation; D014025:Titanium
D015921:Dental Implants; D014025:Titanium