Histomorphologic and bone-to-implant contact evaluation of dual acid-etched and bioceramic grit-blasted implant surfaces: an experimental study in dogs.
OBJECTIVE
The objective of this study was to histologically evaluate a bioceramic grit-blasted and acid-etched surface (presenting calcium and phosphorous incorporation within the surface and its oxide) versus a dual acid-etched (no calcium and phosphorous, control) moderately rough implant surface in a dog tibia model.


METHODS
Implants 3 x 10 mm were placed bilaterally along the proximal tibia of 6 Doberman dogs and remained for 2 and 4 weeks in vivo. After the dogs were euthanized, the implants were nondecalcified processed to approximately 30-microm-thick plates. Transmitted light optical microscopy was used to evaluate healing patterns and bone-to-implant contact. Statistical analysis was performed by 1-way analysis of variance at the 95% level of significance and by Tukey post hoc tests.


RESULTS
At 2 weeks, histologic evaluation showed woven bone formation throughout the perimeter of both implant surfaces. However, replacement of woven bone by lamellar bone was only observed around the test surface at 4 weeks in vivo. No significant differences in bone-to-implant contact were observed for the different groups (P > .27).


CONCLUSIONS
Despite nonsignificant differences between bone-to-implant contact for the different surfaces and times in vivo, higher degrees of bone organization were observed for the test implants. Biomechanical testing is warranted to verify potential differences in biomechanical fixation effectiveness between surfaces.
Suzuki
Marcelo
M
Department of Prosthodontics, Tufts University School of Dental Medicine, Boston, MA, USA.
Guimaraes
Marcia V M
MV
Marin
Charles
C
Granato
Rodrigo
R
Fernandes
Carlos A O
CA
Gil
Jose N
JN
Coelho
Paulo G
PG
D000818:Animals; D002118:Calcium; D002516:Ceramics; D020099:Coated Materials, Biocompatible; D045662:Dental Etching / Q000379:methods; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D017267:Dental Prosthesis Design; D004285:Dogs; D008297:Male; D016348:Osseointegration; D010758:Phosphorus; D013499:Surface Properties; D013977:Tibia / Q000601:surgery
D020099:Coated Materials, Biocompatible; D015921:Dental Implants; D010758:Phosphorus; D002118:Calcium