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Masticatory micromovement in mandibular distraction osteogenesis and its effect on bone growth
Author(s) -
Sun Zongyang,
Rafferty Katherine,
Egbert Mark,
Herring Susan
Publication year - 2007
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.21.5.a134-d
Subject(s) - masticatory force , mastication , distraction osteogenesis , orthodontics , dentistry , distraction , anatomy , medicine , biology , neuroscience
This study was aimed to characterize the interfragmentary micromovement of a mandibular distraction osteogenesis (DO) site during mastication and to document callus formation at different DO stages. Eighteen pigs received a right mandibular angle DO protocol and were divided into 3 groups based on consolidation time (0, 1 and 2 weeks). Implanted differential variable reluctance transducers and ultrasound crystals were used to measure interfragmentary micromovements. Synchronized video and movement recordings were used to determine micromovement polarity. Fluorescent bone labels were administered to evaluate bone deposition. Mastication caused an average 0.3 mm (range 0.1–0.6 mm) micromovement during distraction, which decreased gradually during consolidation. At the power stroke of mastication, most DO sites shortened superiorly and lengthened inferiorly. Active callus formation was present on the periosteal surface and inside the distraction gap, and bone deposition increased with consolidation time. Callus was more advanced on the medial than the lateral side, possibly because of trauma. However, callus formation was not correlated with polarity or magnitude of masticatory micromovement. In conclusion, soft‐diet mastication caused significant interfragmentary movement at mandibular distraction sites, but this movement had no adverse effect on bone healing. Funded by NIH grant DE 14336.