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- Title
The effect of oestrogen and alendronate therapies on postmenopausal bone loss around osseointegrated titanium implants.
- Authors
Giro, Gabriela; Coelho, Paulo G.; Pereira, Rosa Maria Rodrigues; Jorgetti, Vanda; Marcantonio Jr, Elcio; Orrico, Silvana Regina Perez
- Abstract
This study evaluated the influence of oestrogen deficiency and its therapies on bone tissue around osseointegrated implants. Implants were placed in 66 female rats tibiae. The animals were assigned into five groups: control (CTL), sham, ovariectomy (OVX), oestrogen (EST), and alendronate (ALE). While CTL was sacrificed 60 days after implant placement, other groups were subjected to ovariectomy or sham surgery according to group and euthanized after 90 days. Blood and urine samples were collected at sacrifice day for osteocalcin (OCN) and deoxypyridinoline (DPD) quantification. Densitometry of femur and lumbar vertebrae was performed in order to evaluate rats' skeletal impairment. Non-decalcified sections were referred to fluorescent and light microscopy for analyses of mineral apposition rate (MAR), eroded and osteoclastic surfaces, bone-to-implant contact (BIC), and bone area fraction occupancy (BAFO). Results from the OVX group showed significantly lower bone mineral density (BMD), BIC, BAFO, and MAR, while OCN, deoxipiridinoline, eroded surface and ostecoclastic surface were increased compared with the other groups of the study. ALE reduced OCN and DPD concentrations, MAR, osteoclastic and eroded surfaces, and no difference was in BIC and BAFO relative to SHAM. EST and CTL showed similar results to SHAM for measurements. Oestrogen deficiency exerted a negative influence on bone tissue around implants, while oestrogen replacement therapy and alendronate were effective against its effects. Although alendronate therapy maintained the quantity of bone around implants, studies evaluating bone turnover kinetics are warranted. Giro G, Coelho PG, Pereira RMR, Jorgetti V, Marcantonio E Jr, Orrico SRP. The effect of oestrogen and alendronate therapies on postmenopausal bone loss around osseointegrated titanium implants. Clin. Oral Impl. Res. , 2011; 259-264. doi: 10.1111/j.1600-0501.2010.01989.x
- Subjects
ESTROGEN; PHOSPHONATES; POSTMENOPAUSE; OSTEOPOROSIS; OSSEOINTEGRATION; TITANIUM; DENTAL metallurgy; DENTAL implants
- Publication
Clinical Oral Implants Research, 2011, Vol 22, Issue 3, p259
- ISSN
0905-7161
- Publication type
Article
- DOI
10.1111/j.1600-0501.2010.01989.x