The improvement of the implant-bone interface is still an open problem in the long-term mechanical stability of cementless fixed implants. Mechanical, histomorphometric and bone hardness measurements were performed in sheep femoral cortical bone implants at 8 and 12 weeks from surgery to compare in vivo the osseointegration of titanium screws (Dia. 3.5 mm x 7 mm length) with two different surface treatments: sandblasting with 70- 100 µm HA followed by acid etching with HNO3 (Group A) and Ca-P anodízation followed by a hydrothermal treatment (Group B). No significant differences were found for maximum push-out force and interfacial strength between groups at both experimental times. No significant difference was observed for Bone ingrowth between groups at both experimental times, while the Affinity Index of Group B was significantly higher (7.5%, p<0. 05) and lower (10.2%, p<0.05) than that of Group A at 8 and 12 weeks, respectively. Finally, a significant increase in bone mícrohardness measured within 200 µm from the interface and inside the thread depth of Group A was observed between the two experimental times (p<0.05). In conclusion present findings show that osseointegration may be accelerated by adequate surface roughness and bioactive ceramic coating such as current tested treatments which enhance bone interlocking and mineralization. Key words: Titanium implants, Sandblasted and acid-etched surface, Electrochemical surface treatment, Bone histomorphometry, Interfacial strength, Bone mícrohardness
Osteointegration of sandblasted or anodised hydrothermally-treated titanium implants: mechanical, histomorphometric and bone hardness measurements.
Rondelli G;
2002
Abstract
The improvement of the implant-bone interface is still an open problem in the long-term mechanical stability of cementless fixed implants. Mechanical, histomorphometric and bone hardness measurements were performed in sheep femoral cortical bone implants at 8 and 12 weeks from surgery to compare in vivo the osseointegration of titanium screws (Dia. 3.5 mm x 7 mm length) with two different surface treatments: sandblasting with 70- 100 µm HA followed by acid etching with HNO3 (Group A) and Ca-P anodízation followed by a hydrothermal treatment (Group B). No significant differences were found for maximum push-out force and interfacial strength between groups at both experimental times. No significant difference was observed for Bone ingrowth between groups at both experimental times, while the Affinity Index of Group B was significantly higher (7.5%, p<0. 05) and lower (10.2%, p<0.05) than that of Group A at 8 and 12 weeks, respectively. Finally, a significant increase in bone mícrohardness measured within 200 µm from the interface and inside the thread depth of Group A was observed between the two experimental times (p<0.05). In conclusion present findings show that osseointegration may be accelerated by adequate surface roughness and bioactive ceramic coating such as current tested treatments which enhance bone interlocking and mineralization. Key words: Titanium implants, Sandblasted and acid-etched surface, Electrochemical surface treatment, Bone histomorphometry, Interfacial strength, Bone mícrohardnessI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
