Klein Y, Kunthawong N, Fleissig O, Casap N, Polak D, Chaushu S. The impact of alloplast and allograft on bone homeostasis: Orthodontic tooth movement into regenerated bone.
J Periodontol 2020;
91:1067-1075. [PMID:
31887228 DOI:
10.1002/jper.19-0145]
[Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 08/26/2019] [Accepted: 10/25/2019] [Indexed: 01/24/2023]
Abstract
BACKGROUND
The aim of the study is to examine bone healing following augmentation with allograft or β-tricalcium phosphate (β-TCP) and evaluate orthodontic tooth movement (OTM) into the augmented sites.
METHODS
The study included two parts. Part I included the alveolar bone regeneration model. Osseous defects were created by extraction of the maxillary first molars in C57BL/6 mice, and the sockets were filled with allograft, β-TCP, or left unfilled (n = 6/group). Mouse allograft was prepared by a novel method using long bones. Maxillae were collected at 2, 4, and 6 weeks for microcomputed tomography (μCT) and histological analysis. In Part II, OTM was performed after full bone healing, through grafted and unfilled sockets (n = 10/group), and the second molar shift was assessed using μCT.
RESULTS
Bone volume and trabeculation were reduced in β-TCP compared with allograft and non-grafted groups at 2 and 4 weeks post-grafting, but similar at 6 weeks. Graft particles could be detected at 2 weeks post-grafting for β-TCP, and at 2 and 4 weeks for allograft. Increased osteoclasts' presence was observed in the β-TCP group at 2 and 4 weeks compared with allograft and control. OTM was similar in the two graft groups, but impaired versus the non-grafted controls.
CONCLUSION
β-TCP and allograft induce full normal healing but alter OTM into the regenerated sites.
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