J Korean Assoc Oral Maxillofac Surg 2018; 44(2): 79~85
Effect of herbal extracts on bone regeneration in a rat calvaria defect model and screening system
Dong-Hwan Lee1, Il-Kyu Kim1, Hyun-Young Cho1, Ji-Hoon Seo1, Jun-Min Jang1, Jin Kim2
1Oral and Maxillofacial Surgery, Department of Dentistry, Inha University School of Medicine, Incheon,
2Oral Cancer Research Institute and Department of Oral Pathology, Yonsei University College of Dentistry, Seoul, Korea
Il-Kyu Kim
Oral and Maxillofacial Surgery, Department of Dentistry, Inha University Hospital, Inha University School of Medicine, 27 Inhang-ro, Jung-gu, Incheon 22332, Korea
TEL: +82-32-890-2470 FAX: +82-32-890-2475
E-mail: kik@inha.ac.kr
ORCID: http://orcid.org/0000-0003-3930-766X
Received November 23, 2017; Revised January 3, 2018; Accepted January 3, 2018.; Published online April 30, 2018.
© Korean Association of Oral and Maxillofacial Surgeons. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Objectives: The aim of this study was to evaluate the effects of herbal extracts on bone regeneration. Two known samples were screened.
Materials and Methods: We previously established a rat calvaria defect model using a combination of collagen scaffold and herbal extracts. An 8 mm diameter trephine bur with a low-speed dental hand piece was used to create a circular calvaria defect. The experimental group was divided into 4 classifications: control, collagen matrix, Danshen with collagen, and Ge Gan with collagen. Animals in each group were sacrificed at 4, 6, 8, and 10 weeks after surgery, and bone regeneration ability was evaluated by histological examination.
Results: Results revealed that both Danshen and Ge Gan extracts increased bone formation activity when used with collagen matrix. All groups showed almost the same histological findings until 6 weeks. However, after 6 weeks, bone formation activity proceeded differently in each group. In the experimental groups, new bone formation activity was found continuously up to 10 weeks. In the Danshen and Ge Gan groups, grafted materials were still present until 10 weeks after treatment, as evidenced by foreign body reactions showing multinucleated giant cells in chronic inflammatory vascular connective tissue.
Conclusion: Histological analyses showed that Danshen and Ge Gan extractions increased bone formation activity when used in conjunction with collagen matrix.
Keywords: Bone regeneration, Herb extract, Danshen, Ge Gan, Rat calvaria defect

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