Influence of implant protrusion length on non-grafting osteotome sinus floor elevation with simultaneous implant: a 3- to 9-year retrospective study

Yi Yu,Zhengchuan Zhang,Feilong Deng,Qiming Jiang,Xiaolin Yu

doi:10.1186/s40729-021-00304-3

Yi Yu, Zhengchuan Zhang + Show 3 more

Open Access

https://doi.org/10.1186/s40729-021-00304-3

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Abstract

BackgroundThis study analyzed the influence of implant protrusion length (IPL) on the possible factors that affect the long-term outcomes utilizing non-grafting osteotome sinus floor elevation (OSFE) with simultaneous implant placement, and to explore the optimal range of IPL.Materials and methodsA retrospective study design was adopted. The clinical and radiographic data of 105 implants in 65 patients were collected after 3–9 (mean 5.04) years follow-up. IPL was divided into three groups (group1, IPL<2mm; group2, 2mm≤IPL<4mm; group3, IPL≥4mm). Endo-sinus bone gain (ESBG), peri-implant marginal bone loss (MBL), bone to implant contact length (BICL), and percentage of ESBG (%ESBG) were used to evaluate non-grafting OSFE. A Kaplan-Meier analysis was performed to assess the cumulative survival rate. Multiple linear regression model was used to explore the relationship between the possible influence factors and ESBG. Analysis of variance (ANOVA) was applied to explore the correlation of IPL with ESBG, MBL, BICL, and %ESBG.ResultsA total of 102 implants in 62 patients fulfilled the survival criteria, giving the cumulative survival rates of 96.4% and 94.1% for implant-based analysis and patient-based analysis, respectively. The mean ESBG, MBL, and BICL at the latest follow-up were 1.95±0.88 mm, 0.58±0.68 mm, and 5.51±1.47 mm. ESBG was found to be positively correlated to IPL. A significant decreased bone formation efficiency was found when IPL was over 4 mm (P=0.02).ConclusionsAn optimal range of IPL within 4 mm was recommended for better long-term outcomes when applying non-grafting OSFE with simultaneous implant placement.

Highlights

Implant-supported rehabilitation in posterior maxilla is one of the most challenging procedure due to the limited residual bone height and poor bone quality [1]
An optimal range of implant protrusion length (IPL) within 4 mm was recommended for better long-term outcomes when applying non-grafting osteotome sinus floor elevation (OSFE) with simultaneous implant placement
Patient and implant information A total of 105 implants placed simultaneous with non-grafting OSFE in 65 patients (37 males and 28 females) with a mean age of 51.2 years old were enrolled in the present study

Summary

Introduction

Implant-supported rehabilitation in posterior maxilla is one of the most challenging procedure due to the limited residual bone height and poor bone quality [1]. With the development of the implant materials, implant design, and surgical technique, OSFE has been demonstrated to be highly predictable in long-term studies [3, 5,6,7,8]. Even in cases with an extremely atrophic posterior maxilla with a residual bone height (RBH) less than 5 mm, an over 90% implant survival rate has been extensively reported [9,10,11,12]. This study analyzed the influence of implant protrusion length (IPL) on the possible factors that affect the long-term outcomes utilizing non-grafting osteotome sinus floor elevation (OSFE) with simultaneous implant placement, and to explore the optimal range of IPL

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