Intermittent administration of parathyroid hormone improves the repairing process of rat calvaria defects: a histomorphometric and radiodensitometric study
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2015
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Abstract
Background: The aim of this study was to evaluate the effects of intermittent treatment of parathyroid hormone
(PTH (1-34)) on the bone regeneration of critically-sized rat calvarial bone defects.
Material and Methods: Thirty-two male rats were trephined (4mm fullthickness diameter), in the central part
of the parietal bones and divided into 2 groups of 16. The PTH group received subcutaneous injections of PTH
(1-34) at 40μg/kg, 3 times a week and the control (CTL) group received the vehicle in the same regimen. The rats
were sacrificed at 4 weeks post-treatment regimen, the parietal bones were extracted and samples were evaluated
through histomorphometry and radiodensitometry.
Results: The histological observations showed that the PTH group presented more “island-like” new bone between
the defect margins with fibrous tissues than did the CTL group. The PTH group significantly exhibited greater histologic bone formation than did the CTL group (1.5mm ±0.7; 1.9 mm ± 0.6,
p
<0.05/ for residual bone defect). The
radiodensitometry analysis revealed significant differences among the PTH and CTL groups (2.1 Al eq. ±0.04;
1.8Al eq. ±0.06,
p
<0.05), demonstrating an increase in bone mineral density. The PTH treatment contributed to
the bone formation with a higher amount of mineral and/or fibrous tissue when compared with the CTL group.
Conclusions: The results suggest that it was possible to increase the process of bone regeneration by accelerating
the healing process in rat calvarial defects through intermittent administration of the PTH treatment.
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Silva, Eduardo de Paula ; Vasconcelos, Daniel Fernando Pereira ; Marques, Marcelo Rocha ; Dias da Silva, Marco Antonio ; Manzi, Flávio Ricardo ; Barros, Silvana Pereira . Intermittent administration of parathyroid hormone improves the repairing process of rat calvaria defects: a histomorphometric and radiodensitometric study. En: Medicina oral, patología oral y cirugía bucal. Ed inglesa, 2015, Vol. 20, No. 4: 14-