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KMID : 1146620230120030097
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Journal of Korean Academy of Advanced General Dentistry
2023 Volume.12 No. 3 p.97 ~ p.106
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Bone Regeneration Assessment after Systemic Injection of Bisphosphonate and Parathyroid Hormone in the Ovariectomized Rat Calvarial Defect
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Park Kyeong-Mee
Lim Gee-Young
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Abstract
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Although there are many studies comparing the individual effects of zoledronic acid and teriparatide in bone grafting in an osteoporotic environment, the combined effect is not well known. The purpose of this study was to compare the effects of systemic administration of zoledronic acid and teriparatide on bone regeneration at the bone graft site after bone grafting to the cranium defect in rats with osteoporosis induced by ovariectomy. Thirty-nine rats were randomly divided into 8 groups (sham ovariectomy group [sOVX, n=4]; Control group [CONT, n=5]; sham zoledronic acid group [sZA, n=5]; sham teriparatide group [sTPD, n=5]; sham zoledronic acid and sham teriparatide group [sZATPD, n=5]; zoledronic acid group [ZA, n=5]; teriparatide group [TPD, n=5]; zoledronic acid and sham teriparatide group [ZA-TPD, n=5]). A critical size defect with a diameter of 5 mm was formed on both craniums of osteoporosisinduced rats, and bone grafting was performed on only one side. The defect on both sides was covered with a collagen membrane. After bone grafting, zoledronic acid and teriparatide were administered, and all animals were sacrificed 6 weeks after bone grafting. Specimens were subjected to micro-computed tomography and histological analysis. As a result of micro-computed tomography analysis, bone mineral density in the tibia was the highest in the ZA-TPD group, followed by the zoledronic acid and teriparatide groups. Residual graft material at the site where bone grafting was performed was the highest in the TPD group, and new bone increased in the order of CONT, ZA, TPD, and ZATPD groups. The TPD group had the most new bone in the area where bone grafting was not performed, and the CONT group had the biggest BS/BV, but there was no statistically significant difference. As a result of histological morphological analysis, the remaining graft material in the bone graft site decreased in the order of CONT, ZA, TPD, and ZA-TPD groups, and the new bone increased in the order of ZA, ZA-TPD, CONT, and TPD groups. The amount of new bone in the areas where bone grafting was not performed increased in the order of ZA, CONT, TPD, and ZA-TPD groups, and the CONT and TPD groups showed a statistically significant difference from the ZA-TPD group. Zoledronic acid and teriparatide showed differences in bone regeneration at the parietal bone graft site, and the combination of the two drugs was more effective in bone regeneration.
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KEYWORD
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Bisphosphonate, Teriparatide hormone, Ovariectomy, Osteoporosis, Calvarial bone graft, Rat
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