West China Journal of Stomatology ›› 2021, Vol. 39 ›› Issue (5): 570-575.doi: 10.7518/hxkq.2021.05.012

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Retrospective study on the merits of bone grafts and the influence of implant protrusion length after osteotome sinus elevation surgery

Yang Dawei(), Xiao Jingyi, Zhang Peng, Lu Boyao, Liang Xing.()   

  1. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
  • Received:2020-08-31 Revised:2021-06-24 Online:2021-10-01 Published:2021-10-11
  • Contact: Liang Xing. E-mail:2016937730@qq.com;xingliangdent@vip.163.com
  • Supported by:
    National High-tech Research and Development Program (863 program)(2015AA033701);Correspondence: Liang Xing, E-mail: xingliangdent@vip.163.com

Abstract: Objective

This study aims to evaluate the endo-sinus bone remodeling of dental implants placed via osteotome sinus floor elevation (OSFE) after 6 months and using different implant protrusion lengths and bone grafts through cone beam computed tomography (CBCT).


Ninety-six patients with 124 implants were included and assigned into four groups. Group 1: implant protrusion length<4 mm with bone graft; group 2: implant protrusion length>4 mm with bone graft; group 3: implant protrusion length<4 mm without bone graft; group 4: implant protrusion length>4 mm without bone graft. Apical bone gain (ABG), cortical bone gain (CBG), bone density gain (BDG), and marginal bone loss (MBL) were observed and analyzed at baseline and 6 months after implant surgery.


The CBG in grafted groups 1 and 2 was higher than that in non-grafted groups. The ABG and BDG were higher in non-grafted groups 3 and 4 than in grafted groups, and the levels in group 3 were higher than those in group 4. The CBG in grafted group 2 was higher than that in group 1. No significant difference was observed in MBL analysis.


The BDG of IPL<4 mm implants was higher than IPL>4 mm implant when bone grafts were not applied. No relevance was observed between IPL and CBG. Bone grafts can accelerate endo-sinus bone remodeling by increasing CBG and dissipating the influence of IPL on BDG.

Key words: dental implant, bone grafts, implant protrusion length, osteotome sinus floor elevation

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