Journal of Periodontal and Implant Science

Korean Academy of Periodontology (대한치주과학회)
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Regenerative capacity of augmented bone in rat calvarial guided bone augmentation model

  • Kubota, Tatsuya (Division of Applied Oral Sciences, Nihon University Graduate School of Dentistry) ;
  • Hasuike, Akira (Department of Periodontology, Nihon University School of Dentistry) ;
  • Ozawa, Yasumasa (Division of Applied Oral Sciences, Nihon University Graduate School of Dentistry) ;
  • Yamamoto, Takanobu (Division of Applied Oral Sciences, Nihon University Graduate School of Dentistry) ;
  • Tsunori, Katsuyoshi (Department of Periodontology, Nihon University School of Dentistry) ;
  • Yamada, Yutaka (Private Practice) ;
  • Sato, Shuichi (Department of Periodontology, Nihon University School of Dentistry)
  • Received : 2016.12.26
  • Accepted : 2017.02.12
  • Published : 2017.04.30
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Abstract

Purpose: Guided bone regeneration (GBR) is the most widely used technique to regenerate and augment bones. Even though augmented bones (ABs) have been examined histologically in many studies, few studies have been conducted to examine the biological potential of these bones and the healing dynamics following their use. Moreover, whether the bone obtained from the GBR procedure possesses the same functions as the existing autogenous bone is uncertain. In particular, little attention has been paid to the regenerative ability of GBR bone. Therefore, the present study histologically evaluated the regenerative capacity of AB in the occlusive space of a rat guided bone augmentation (GBA) model. Methods: The calvaria of 30 rats were exposed, and plastic caps were placed on the right of the calvaria in 10 of the 30 rats. After a 12-week healing phase, critical-sized calvarial bone defects (diameter: 5.0 mm) were trephined into the dorsal parietal bone on the left of the calvaria. Bone particles were harvested from the AB or the cortical bone (CB) using a bone scraper and transplanted into the critical defects. Results: The newly generated bone at the defects' edge was evaluated using micro-computed tomography (micro-CT) and histological sections. In the micro-CT analysis, the radiopacity in both the augmented and the CB groups remained high throughout the observational period. In the histological analysis, the closure rate of the CB was significantly higher than in the AB group. The numbers of cells positive for runt-related transcription factor 2 (Runx2) and tartrate-resistant acid phosphatase (TRAP) in the AB group were larger than in the CB group. Conclusions: The regenerative capacity of AB in the occlusive space of the rat GBA model was confirmed. Within the limitations of this study, the regenerative ability of the AB particulate transplant was inferior to that of the CB particulate transplant.

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