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Maturation of periodontal tissues following implantation of rhGDF-5/β-TCP in one-wall intra-bony defects in dogs: 24-week histological observations.

Authors :
Lee JS
Wikesjö UM
Park JC
Jang YJ
Pippig SD
Bastone P
Choi SH
Kim CK
Source :
Journal of clinical periodontology [J Clin Periodontol] 2012 May; Vol. 39 (5), pp. 466-74. Date of Electronic Publication: 2012 Mar 26.
Publication Year :
2012

Abstract

Objective: Although a previous study reported that recombinant human growth/differentiation factor-5 (rhGDF-5) coated onto a β-tricalciumphosphate (β-TCP) significantly enhanced periodontal regeneration, the long-term stability/maturation of the regenerated tissues has not been demonstrated. The objective of this study was to evaluate periodontal regeneration/maturation following application of rhGDF-5/β-TCP using an established periodontal defect model and a 24-week healing interval.<br />Material & Methods: Unilateral, surgically created, 4 × 4 × 5 mm (length × width × height), one-wall, critical-size, intra-bony periodontal defects at the mandibular second and fourth premolar teeth in five young adult Beagle dogs received rhGDF-5/β-TCP. Bilateral sites at the fourth premolar in the other four dogs served as pristine controls receiving mucogingival flap surgery without defect induction. The animals were euthanized at 24 weeks for histological analysis. Unpublished data from the previous 8-week study were used to compare tissue maturation between 8 and 24 weeks.<br />Results: Linear histometric observations of cementum and alveolar regeneration showed no significant differences between the 8- and 24-week observation intervals. However, parameters of periodontal tissue maturation showed significant differences between the observation intervals including increased fraction mineralized tissue and lamellar bone (p < 0.05) and decreased osteocyte counts (p < 0.05) at 24 weeks compared with 8 weeks. Although the count inserting Sharpey's fibre did not significantly change, regenerated cementum remote from the intact periodontal ligament appeared more highly mineralized and thicker at 24 weeks compared with 8 weeks, and compared with the pristine cementum. Minimal β-TCP remained.<br />Conclusions: These 24-week observations suggest that regenerated periodontal tissues in sites receiving rhGDF-5/β-TCP undergo progressive maturation without debilitating aberrant tissue reactions.<br /> (© 2012 John Wiley & Sons A/S.)

Details

Language :
English
ISSN :
1600-051X
Volume :
39
Issue :
5
Database :
MEDLINE
Journal :
Journal of clinical periodontology
Publication Type :
Academic Journal
Accession number :
22449372
Full Text :
https://doi.org/10.1111/j.1600-051X.2012.01862.x