title: Frequency of bone graft in implant surgery.
abstract: BACKGROUND
  Implant surgery has become popular with the advance of surgical techniques such as sinus lifting, guided bone regeneration, and block bone graft. However, there were no data about the frequency of bone graft during implant surgery. The purpose of this study was to report the frequency and types of bone graft depending on dental implant patients' profile to complement the database regarding implant surgery.
  
  
  METHODS
  The implant operations had been performed from January 2006 to October 2014. The upper and lower jaws were divided into six sextants. A total of 792 sextants were included in this study. Patient information including sex, age, sites, bone graft, and types of bone were investigated.
  
  
  RESULTS
  A total of 1512 implants had been placed. Male and female sextants were 421 and 371, respectively (M:F = 1:0.88). Average age was 54.3 (ranging from 20 to 88 years old). Implants were placed in the posterior maxilla (322 sextants, 40.7 %), posterior mandible (286 sextants, 36.1 %), anterior maxilla (127 sextants, 16.1 %), and anterior mandible (57 sextants, 7.2 %). Bone graft was performed in 50.3 % of the sextants. Among the bone grafted sites, sinus lifting with lateral approach (22.1 %) and guided bone regeneration (22.7 %) were performed most frequently.
  
  
  CONCLUSIONS
  Bone graft in implant surgery was necessary to augment defects. More than half of the sextants needed bone graft for implant installation.
authors.affiliation: Department of Prosthodontics, College of Medicine, University of Ulsan, Asan Medical Center, Seoul, Korea.
authors.forename: Hyun-Suk
authors.initials: HS
authors.lastname: Cha
authors.affiliation: Department of Oral and Maxillofacial Surgery, College of Medicine, University of Ulsan, Asan Medical Center, 88, Olympic-ro, 43-gil, Songpa-gu, Seoul, 138-736 Korea.
authors.forename: Ji-Wan
authors.initials: JW
authors.lastname: Kim
authors.affiliation: Department of Oral and Maxillofacial Surgery, College of Medicine, University of Ulsan, Asan Medical Center, 88, Olympic-ro, 43-gil, Songpa-gu, Seoul, 138-736 Korea.
authors.forename: Jong-Hyun
authors.initials: JH
authors.lastname: Hwang
authors.affiliation: Department of Oral and Maxillofacial Surgery, College of Medicine, University of Ulsan, Asan Medical Center, 88, Olympic-ro, 43-gil, Songpa-gu, Seoul, 138-736 Korea.
authors.forename: Kang-Min
authors.initials: KM
authors.lastname: Ahn
keywords: Block bone graft; Bone graft; Dental implant; Guided bone regeneration; Sinus lifting