title: A novel chitosan-γPGA polyelectrolyte complex hydrogel promotes early new bone formation in the alveolar socket following tooth extraction.
abstract: A novel chitosan-γPGA polyelectrolyte complex hydrogel (C-PGA) has been developed and proven to be an effective dressing for wound healing. The purpose of this study was to evaluate if C-PGA could promote new bone formation in the alveolar socket following tooth extraction. An animal model was proposed using radiography and histomorphology simultaneously to analyze the symmetrical sections of Wistar rats. The upper incisors of Wistar rats were extracted and the extraction sockets were randomly treated with gelatin sponge, neat chitosan, C-PGA, or received no treatment. The extraction sockets of selected rats from each group were evaluated at 1, 2, 4, or 6 wk post-extraction. The results of radiography and histopathology indicated that the extraction sockets treated with C-PGA exhibited lamellar bone formation (6.5%) as early as 2 wk after the extraction was performed. Moreover, the degree of new bone formation was significantly higher (P < 0.05) in the extraction sockets treated with C-PGA at 6 wk post-extraction than that in the other study groups. In this study, we demonstrated that the proposed animal model involving symmetrical sections and simultaneous radiography and histomorphology evaluation is feasible. We also conclude that the novel C-PGA has great potential for new bone formation in the alveolar socket following tooth extraction.
authors.affiliation: School of Dentistry, National Taiwan University, Taipei, Taiwan; Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan.
authors.forename: Hao-Hueng
authors.initials: HH
authors.lastname: Chang
authors.affiliation: School of Dentistry, National Taiwan University, Taipei, Taiwan; Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan.
authors.forename: Yin-Lin
authors.initials: YL
authors.lastname: Wang
authors.affiliation: School of Dentistry, National Taiwan University, Taipei, Taiwan; Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan.
authors.forename: Yu-Chih
authors.initials: YC
authors.lastname: Chiang
authors.affiliation: School of Dentistry, National Taiwan University, Taipei, Taiwan; Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan.
authors.forename: Yen-Liang
authors.initials: YL
authors.lastname: Chen
authors.affiliation: School of Dentistry, National Taiwan University, Taipei, Taiwan.
authors.forename: Yu-Horng
authors.initials: YH
authors.lastname: Chuang
authors.affiliation: School of Dentistry, National Taiwan University, Taipei, Taiwan; Department of Dentistry, Cardinal Tien Hospital Yonghe Branch, New Taipei, Taiwan.
authors.forename: Shang-Jye
authors.initials: SJ
authors.lastname: Tsai
authors.affiliation: Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan.
authors.forename: Kuo-Huang
authors.initials: KH
authors.lastname: Heish
authors.affiliation: Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan.
authors.forename: Feng-Huei
authors.initials: FH
authors.lastname: Lin
authors.affiliation: School of Dentistry, National Taiwan University, Taipei, Taiwan; Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan.
authors.forename: Chun-Pin
authors.initials: CP
authors.lastname: Lin
mesh_terms: D000539:Alveolar Process / Q000000981:diagnostic imaging / Q000473:pathology; D000818:Animals; D048271:Chitosan / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000627:therapeutic use; D008297:Male; D010012:Osteogenesis / Q000187:drug effects*; D011099:Polyglutamic Acid / Q000031:analogs & derivatives* / Q000627:therapeutic use; D011859:Radiography; D017208:Rats, Wistar; D014081:Tooth Extraction; D014945:Wound Healing / Q000187:drug effects
chemical_list: C000594594:chitosan-poly(gamma-glutamic acid); D011099:Polyglutamic Acid; D048271:Chitosan