| 4002 Osseointegration of different implant surfaces in poor bone quality sites | ||
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D. WENG1, M. HOFFMEYER2, and E.-J. RICHTER1, 1University of Würzburg, Germany, 2University of Texas at Houston, USA Poor bone quality sites, i.e. bone sites with low mineralized tissue content, have exhibited higher implant failure rates than dense bone areas. Changing the implant surface seems to influence the bone-to-implant contact rate and thus may produce lower failure rates in such sites. Objectives: It was the purpose of this animal study to histomorphometrically compare two different implant surfaces in bone sites with low mineralized tissue content. Methods: In five adult fox hounds, all premolars on one side of the mandible were extracted. The sites were allowed to heal for 8 months. Four screw-type implants (2 implants with a machined surface [ICE group] and 2 implants with a double acid-etched surface [OSS group]; Implant Innovations, Inc., Palm Beach Gardens/FL, USA) with a diameter of 3.75 mm and a length of 10 mm were inserted into the mandible. The apex of the implant was positioned into the "hollow" part of the dog mandible where the mineralized tissue content is low. After a healing time of 4 months, the dogs were sacrificed, and histologic and histomorphometric evaluations were performed. Results: All implants were clinically and histologically osseointegrated. Bone density measurements revealed a lower mineralized tissue content in the peri-apical area (ICE 49.9±16.7% mineralized tissue, OSS 52.2±8.4%) compared to a reference area where the implant was in contact with dense bone (ICE 93.0±10.4%, OSS 96.8±2.5%; p<0.05, paired t test). Despite similar amounts of mineralized tissue content in the apical area around the implant, the double acid-etched implant had a significant higher bone-to-implant contact rate than the machined implant (OSS 63.2±12.5% vs. ICE 40.7±11.5%; p<0.01, paired t test). Conclusions: It is concluded from this animal experiment that, in poor bone quality sites, a double acid-etched implant surface can achieve a significant higher bone-to-implant contact compared to a machined implant. | ||
| Seq #371 - Bone Response to Surfaces/Scaffolds 3:45 PM-5:45 PM, Saturday, 9 March 2002 San Diego Convention Center Room 10 (Upper Level) | ||
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