title: Aesthetic recovery of alveolar atrophy following autogenous onlay bone grafting using interconnected porous hydroxyapatite ceramics (IP-CHA) and resorbable poly-L-lactic/polyglycolic acid screws: case report.
abstract: BACKGROUND
  Onlay bone grafting techniques have some problems related to the limited volume of autogenous grafted bone and need for surgery to remove bone fixing screws. Here, we report a case of horizontal alveolar ridge atrophy following resection of a maxillary bone cyst, in which autogenous onlay bone grafting with interconnected porous hydroxyapatite ceramics (IP-CHA) and bioresorbable poly-L-lactic/polyglycolic acid (PLLA-PGA) screws was utilized.
  
  
  METHODS
  A 51-year-old man had aesthetic complications related to alveolar atrophy following maxillary bone cyst extraction. We performed onlay grafting for aesthetic alveolar bone recovery using IP-CHA to provide adequate horizontal bone volume and PLLA-PGA screws for bone fixing to avoid later damage to host bone during surgical removal. During the operation, an autogenous cortical bone block was collected from the ramus mandibular and fixed to the alveolar ridge with PLLA-PGA screws, then the gap between the bone block and recipient bone was filled with a granular type of IP-CHA. Post-surgery orthopantomograph and CT scan findings showed no abnormal resorption of the grafted bone, and increased radiopacity, which indicated new bone formation in the area implanted with IP-CHA.
  
  
  CONCLUSIONS
  Our results show that IP-CHA and resorbable PLLA-PGA screws are useful materials for autogenous onlay bone grafting.
authors.forename: Kazumi
authors.initials: K
authors.lastname: Kubozono
authors.forename: Masaaki
authors.initials: M
authors.lastname: Takechi
authors.affiliation: Department of Oral & Maxillofacial Surgery, Graduate School of Biomedical & Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-Ku, Hiroshima 734-8553, Japan. otkouji@hiroshima-u.ac.jp.
authors.forename: Kouji
authors.initials: K
authors.lastname: Ohta
authors.forename: Shigehiro
authors.initials: S
authors.lastname: Ono
authors.forename: Takayuki
authors.initials: T
authors.lastname: Nakagawa
authors.forename: Shinichi
authors.initials: S
authors.lastname: Fujimoto
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Kamata
mesh_terms: D020341:Absorbable Implants; D000540:Alveolar Ridge Augmentation / Q000379:methods*; D001284:Atrophy; D064592:Autografts / Q000637:transplantation*; D001863:Bone Screws; D018786:Bone Substitutes / Q000627:therapeutic use*; D016025:Bone Transplantation / Q000379:methods*; D016379:Denture, Partial, Fixed, Resin-Bonded; D017886:Durapatite / Q000627:therapeutic use*; D004955:Esthetics, Dental; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000601:surgery; D019344:Lactic Acid / Q000737:chemistry*; D008297:Male; D008437:Maxilla / Q000601:surgery*; D008439:Maxillary Diseases / Q000601:surgery; D008875:Middle Aged; D010012:Osteogenesis / Q000502:physiology; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011842:Radicular Cyst / Q000601:surgery; D011862:Radiography, Panoramic / Q000379:methods; D014057:Tomography, X-Ray Computed / Q000379:methods
chemical_list: D018786:Bone Substitutes; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D017886:Durapatite