Effects of local single dose administration of parathormone on the early stages of osseointegration: A pre‐clinical study

Autor: João Ricardo Almeida Grossi, Tatiana Miranda Deliberador, Allan Fernando Giovanini, João César Zielak, Aline Sebastiani, Carla Castiglia Gonzaga, Paulo G. Coelho, André Luis Zétola, Fernando P. Weiss, Ernesto B. Benalcázar Jalkh, Carmen Lucia Mueller Storrer, Lukasz Witek
Rok vydání: 2022
Předmět:
Zdroj: Journal of Biomedical Materials Research Part B: Applied Biomaterials. 110:1806-1813
ISSN: 1552-4981
1552-4973
Popis: The present study aimed to evaluate the effect of parathormone (PTH) administered directly to the implant's surface prior to insertion, using a large translational animal model. Sixty titanium implants were divided into four groups: (i) Collagen, control group, where implants were coated with Type-I Bovine-collagen, and three experimental groups, where implants received varying doses of PTH: (ii) 12.5, (iii) 25, and (iv) 50 μg, prior to placement. Fifteen female sheep (~2 years old, weighing ~65 kg) received four implants in an interpolated fashion in C3, C4 or C5 vertebral bodies. After 3-, 6- and 12-weeks, samples were harvested, histologically processed, qualitatively and quantitatively assessed for bone-to-implant contact (BIC) and bone area fraction occupancy (BAFO). BIC yielded lower values at 6-weeks for 50 μg relative to the control group, with no significant differences, when compared to the 12.5- and 25-μg. No significant differences were detected at 6-weeks between collagen, 12.5- and 25-μg groups. At 3- and 12-weeks, no differences were detected for BIC among PTH groups. With respect to BAFO, no significant differences were observed between the control and experimental groups independent of PTH concentration and time in vivo. Qualitative observations at 3-weeks indicated the presence of a more mature bone near the implant's surface with the application of PTH, however, no significant differences in new bone formation or healing patterns were observed at 6- and 12-weeks. Single local application of different concentrations of PTH on titanium implant's surface did not influence the osseointegration at any time-point evaluation in low-density bone.
Databáze: OpenAIRE
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