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- Title
The osseointegration behavior of titanium-zirconium implants in ovariectomized rabbits.
- Authors
Wen, Bo; Zhu, Feng; Li, Zhen; Zhang, Peng; Lin, Xingnan; Dard, Michel
- Abstract
Objective The aim of this study is to compare the osseointegration behavior of titanium ( Ti) and titanium-zirconium ( Ti Zr) implants in ovariectomized ( OVX) rabbits. Materials and methods Twelve ovariectomized New Zealand rabbits submitted to a hypocalcic diet and 12 sham-aged rabbits were used. After the bone mass loss induction period, Ti Zr or Ti implants both benefiting from a SLActive surface treatment were randomly inserted in the tibia and femur of each animal. The total of 24 rabbits were divided in four groups ( n = 6): SHAM + Ti, OVX + Ti, SHAM + Ti Zr, OVX + Ti Zr. The animals were respectively sacrificed 3 and 6 weeks after dental implant placement. Six implants in each group at each time point were subjected to removal torque testing, and the remaining implants were prepared for histomorphometric analysis. Results At the end of the healing period, all implants were osseointegrated. The removal torque value of the SHAM- Ti Zr group was significantly higher than those of the SHAM- Ti group ( P < 0.001). The removal torque of the OVX- Ti group was significantly lower than those of the OVX- Ti Zr group. All groups demonstrated an increase in the peak torque value after 6 weeks: 46.0 and 50.8 Ncm for the OVX and the SHAM animals, respectively, in the case where Ti implants were used. When Ti Zr implants were inserted, the values reached 60.7 and 76.2 Ncm with a similar group configuration. The BIC and the BA/ TA analysis showed an increase between week 3 and 6 in the case of nonovariectomized animals. From week 3 to 6, the BIC went from 37.1 ± 14.3 to 47.7 ± 8.7 for the SHAM + Ti group and from 37.6 ± 10.9 to 50.4 ± 11 for the SHAM + Ti Zr group. The BIC values were not significantly different between groups. Conclusion The parameters intended to be representative of the bone morphology ( BIC & BATA) did not help to discriminate between Ti and Ti Zr which appeared to behave similarly in this experimental model. However, the removal torque values for the Ti Zr group were statistically higher than those of the Ti group in both the SHAM and the ovariectomized animals. That likely reflected an increased quality of bone around the TiZr implants.
- Subjects
OSSEOINTEGRATED dental implants; TITANIUM alloys; TITANIUM; OVARIECTOMY; LABORATORY rabbits
- Publication
Clinical Oral Implants Research, 2014, Vol 25, Issue 7, p819
- ISSN
0905-7161
- Publication type
Article
- DOI
10.1111/clr.12141