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Influence of extended operation time and of occlusal force on determination of pulpal healing pattern in replanted mouse molars

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Abstract

The mechanism regulating the divergent healing processes following tooth replantation is unclear. This study clarifies the relationship between the healing pattern, the time taken for tooth replantation, and the influence of occlusal force. We investigated the pulpal healing process after tooth replantation by immunohistochemistry for 5-bromo-2′-deoxyuridine and nestin and by histochemistry for tartrate-resistant acid phosphatase. The upper right first molar of 3-week-old mice was extracted and repositioned in the original socket immediately or 30 min to 6 h after the operation. We divided the animals into a non-occluded group in which the lower right first molar was extracted and an occluded group without extraction of the counterpart tooth. In control teeth (upper left first molar), the periphery of the coronal dental pulp showed intense nestin-positive reaction. Tooth replantation weakened the nestin-positive reaction in the pulp tissue. On postoperative days 5–7, tubular dentin formation commenced next to preexisting dentin in which nestin-positive odontoblast-like cells were arranged in successful cases. In other cases, bone-like tissue formation occurred in the pulp chamber until day 14. The ratio of tertiary dentin formation was significantly higher in the non-occluded group. The intentionally prolonged time for the completion of tooth replantation induced bone-like tissue formation, expanded inflammatory reaction, or fibrous tissue formation in pulp tissue. Thus, the lack of a proper oxygenated medium is probably decisive for the survival of odontoblast-lineage cells, and occlusal force during and/or after operation worsens the fate of these cells.

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Acknowledgements

We are grateful to Mr. Shin-ichi Kenmotsu for his technical assistance.

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Correspondence to Hayato Ohshima.

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This work was supported in part by KAKENHI (B) from MEXT, Japan (no. 16390523 to H.O.) and by the Japan-Korea Joint Research Project from JSPS and KOSEF.

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Hasegawa, T., Suzuki, H., Yoshie, H. et al. Influence of extended operation time and of occlusal force on determination of pulpal healing pattern in replanted mouse molars. Cell Tissue Res 329, 259–272 (2007). https://doi.org/10.1007/s00441-007-0424-4

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