title: [Short-term evaluation of clinical effect of bone ring grafting and immediate insertion].
abstract: OBJECTIVE
  To observe the short-term clinical effectiveness of bone ring graft technique and to summarize the key points of related surgical operation to provide comprehensive clinical guidelines.
  
  
  METHODS
  Fifteen patients with severe alveolar bone absorption were selected to receive bone ring grafting and immediate dental implant. Final fixed prostheses were cemented five months after initial implantation. Cone beam CT scans were conducted on all subjects before the procedure, as well as four months post-operation to evaluate alveolar bone height and level of bone height and absorption around the implants. Four to six months after prosthesis installation, each implant's Jemt classification, gingiva attachment, and probing depth (PD) were analyzed. The difference of PD between implants and adjacent teeth, as well as the difference of the bone absorption between labial and lingual sides, was compared. The survival rate of the bone ring and the retention rate of implants were calculated. Complications and patient satisfaction were also investigated.
  
  
  RESULTS
  Bone graft survival rate was 94.4% and dental implantation retention rate was 100% four months post-operation. Average bone level increase was (6.06 +/- 1.06) mm, average bone absorption was (1.33 +/- 0.84) mm, and average bone thickness at the neck of the dental implant body was (6.94 +/- 0.73) mm. Approximately 4 to 6 months after crown restoration, average bone level increase was (5.62 +/- 1.03) mm, average bone absorption was (1.51 +/- 1.02) mm, and average bone thickness at the neck of the dental implant body was (6.77 +/- 0.72) mm. The PD around the implant body and the adjacent teeth was statistically insignificant. No major post-operative complication was observed, restorations were successful, and patient satisfaction level was high.
  
  
  CONCLUSIONS
  Bone ring graft technique and immediate dental implantation are relatively simple to perform, and these techniques facilitate reduction in required treatment time. Short-term effect is reliable and satisfactory, whereas long-term outcomes require further follow up and study.
authors.forename: Jin
authors.initials: J
authors.lastname: Liang
authors.forename: Baoqi
authors.initials: B
authors.lastname: Jiang
authors.forename: Jing
authors.initials: J
authors.lastname: Lan
authors.forename: Haiyun
authors.initials: H
authors.lastname: Huang
authors.forename: Zhenkun
authors.initials: Z
authors.lastname: Zhu
authors.forename: Yong
authors.initials: Y
authors.lastname: Wen
authors.forename: Xiaoni
authors.initials: X
authors.lastname: Ma
authors.forename: Xin
authors.initials: X
authors.lastname: Xu
mesh_terms: D016301:Alveolar Bone Loss; D016025:Bone Transplantation; D003442:Crowns; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D006801:Humans
chemical_list: D015921:Dental Implants