Objective Composite of synthetic octacalcium phosphate and collagen (OCP/Col) enhances bone regeneration if implanted into human, canine, or rodent bone defects. This study was designed to investigate the influence on eruption of the permanent successor tooth and alveolar height of OCP/Col implantation into extraction cavities of deciduous teeth. Design Disks of OCP/Col prepared from synthetic granules of octacalcium phosphate (OCP) and porcine atelocollagen, and commercially available sintered porous β-tricalcium phosphate (β-TCP) was implanted into the prepared defect of eleven male beagle dogs by extraction of two deciduous premolars. Untreated group had nothing implanted into the prepared defect, and physiological group (Physiol group) was observed without any treatment. Periodical macroscopic and radiographic examinations were performed until the period equivalent to the physiological eruption of permanent successor teeth (P3 and P4). Results Although no unerupted permanent successor teeth were observed among the OCP/Col, Untreated, and Physiol groups, two permanent successor teeth were unerupted in the β-TCP group. No significant difference of the alveolar heights or the eruptive position in P3 and P4 was observed between OCP/Col and Physiol groups. Conclusion OCP/Col implantation in the alveolar region that included the unerupted permanent successor teeth would cause no disturbance of permanent tooth eruption and preserve the alveolar ridge.
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