title: Use of the sandwich osteotomy plus an interpositional allograft for vertical augmentation of the alveolar ridge.
abstract: BACKGROUND
  Vertical augmentation of the alveolar ridge is necessary for extensive resorption of the alveolar ridge.
  
  
  OBJECTIVE
  To evaluate treatment outcome after alveolar ridge augmentation by a sandwich osteotomy combined with an interpositional allograft.
  
  
  METHODS
  The deficient alveolar ridges were augmented by a sandwich osteotomy combined with bovine collagen matrix as an interpositional allograft placed between the basal bone and the osteotomized fragment without fixation. Standardized lateral cephalographs were taken of nine patients, before surgery, immediately postoperatively and 3 months after augmentation to evaluate the level of augmentation, bone loss and stability of the osteotomized fragment.
  
  
  RESULTS
  The augmentation ranged between 8.4 and 11.0mm (mean 9.8mm). Bone resorption in the crestal bone height ranged from 1.5 to 3.0mm (mean 2.1mm) after 3 months. Bone resorption in thickness of the osteotomized fragment ranged from 0.3 to 2.0mm (mean 1.0mm).
  
  
  CONCLUSIONS
  Although there was some resorption of the superior and anterior parts of the reconstructed alveolar process, it was concluded that this procedure of augmentation is safe.
authors.affiliation: Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University, South Korea. choibh@wonju.yonsei.ac.kr
authors.forename: Byung-Ho
authors.initials: BH
authors.lastname: Choi
authors.forename: Seoung-Ho Robert
authors.initials: SH
authors.lastname: Lee
authors.forename: Jin-Young
authors.initials: JY
authors.lastname: Huh
authors.forename: Sang-Gyun
authors.initials: SG
authors.lastname: Han
mesh_terms: D000293:Adolescent; D000328:Adult; D016301:Alveolar Bone Loss / Q000601:surgery*; D000540:Alveolar Ridge Augmentation / Q000379:methods*; D000818:Animals; D018786:Bone Substitutes; D002417:Cattle; D003094:Collagen; D005260:Female; D006801:Humans; D008297:Male; D008336:Mandibular Diseases / Q000601:surgery*; D008875:Middle Aged; D010027:Osteotomy / Q000379:methods; D014183:Transplantation, Heterologous
chemical_list: D018786:Bone Substitutes; C483614:osteovit; D003094:Collagen