Early Bone Healing and Biomechanical Fixation of Dual Acid-Etched and As-Machined Implants with Healing Chambers: An Experimental Study in Dogs

Made available in DSpace on 2022-04-28T22:37:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-01-01 To evaluate the biomechanical fixation, bone-to-implant contact (BIC), and bone morphology of screw-type root-form implants with healing chambers with as-machined or dual acid-etched (DAE) surfaces in a canine model. Materials and Methods: The animal model included the placement of machined (n = 24) and DAE (n = 24) implants along the proximal tibiae of six mongrel dogs, which remained in place for 2 or 4 weeks. Following euthanasia, half of the specimens were subjected to biomechanical testing (torque to interface failure) and the other half were processed for histomorphologic and histomorphometric (%BIC) assessments. Statistical analyses were performed by one-way analysis of variance at the 95% confidence level and the Tukey post hoc test for multiple comparisons. Results: At 4 weeks, the DAE surface presented significantly higher mean values for torque to interface failure overall. A significant increase in %BIC values occurred for both groups over time. For both groups, bone formation through the classic appositional healing pathway was observed in regions where intimate contact between the implant and the osteotomy walls occurred immediately after implantation. Where contactfree spaces existed after implantation (healing chambers), an intramembranous-like healing mode with newly formed woven bone prevailed. Conclusions: In the present short-term evaluation, no differences were observed in BIC between groups; however, an increase in biomechanical fixation was seen from 2 to 4 weeks with the DAE surface. © 2011 by Quintessence Publishing Co Inc. Department of Prosthodontics University of São Paulo Bauru School of Dentistry, Bauru Department of Dentistry Universidade Federal de Santa Catarina, Florianopolis Department of Prosthodontics Tufts University School of Dental Medicine, Boston, MA Department of Periodontology Universidade Federal de Uberlandia, Uberlandia Department of Oral Diagnosis and Surgery Faculdade de Odontologia de Araraquara São Paulo State University, Araraquara, São Paulo Department of Biomaterials and Biomimetics New York University, New York, NY Department of Oral Diagnosis and Surgery Faculdade de Odontologia de Araraquara São Paulo State University, Araraquara, São Paulo