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Experimental tooth movement into bone induced by recombinant human bone morphogenetic protein-2
Tatsuo Kawamoto1, Nobuyoshi Motohashi, Atsushi Kitamura
1Maxillofacial Orthognathics, Maxillofacial Reconstruction, Division of Maxillofacial/Neck Reconstruction, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan. t-kawamoto.mort@tmd.ac.jp
Summary
Low-dose recombinant human morphogenetic protein-2 (rhBMP-2) significantly accelerates bone regeneration and reduces root resorption during orthodontic tooth movement in alveolar cleft defects. Proper rhBMP-2 dosage is crucial for successful clinical outcomes.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Orthodontics
Background:
- Recombinant human morphogenetic protein-2 (rhBMP-2) shows promise for osseous regeneration in alveolar cleft bone grafting.
- Previous studies utilized high-dose rhBMP-2, necessitating further investigation into optimal dosing.
Purpose of the Study:
- To evaluate the osteoinductive potential of a low dose of rhBMP-2 (10 microg/100 microL) in alveolar cleft defects.
- To assess the biological response of newly formed bone to orthodontic stimulation, comparing low-dose to high-dose rhBMP-2.
Main Methods:
- Surgical creation of bone defects in beagle dogs following maxillary first premolar extraction.
- Implantation of rhBMP-2 within a PLGA/gelatin sponge complex (PGS).
- Histological and morphometric analysis to evaluate osteoinduction and tooth movement into regenerated bone.
Main Results:
- Low-dose rhBMP-2 demonstrated a significantly earlier onset of bone remodeling compared to high-dose rhBMP-2.
- During orthodontic tooth movement, low-dose rhBMP-2 resulted in only partial cementum resorption, whereas high-dose rhBMP-2 caused root resorption.
Conclusions:
- The study highlights the dose-dependent effects of rhBMP-2 on bone regeneration and orthodontic response.
- Determining the appropriate rhBMP-2 dosage is essential for effective clinical application in alveolar cleft repair.