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KMID : 1025720230420030046
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Journal of Dental Implant Research
2023 Volume.42 No. 3 p.46 ~ p.52
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A retrospective study on the factors associated with marginal bone loss of short implants placed in posterior regions
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Lee Hae-Seok
Kim Tae-Wan
Yuanyuan Wang
Yang Zhou
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Abstract
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Purpose: This retrospective cohort study was performed to assess marginal bone loss (MBL) and its risk factors in patients with a shorter-than-conventional length implant in the posterior regions of the mandible or maxilla.
Materials and Methods: The study sample was composed of short implants (7-mm length, 4-mm diameter). Periapical radiographs were taken immediately after functional loading, 6 months after prosthesis delivery, and at all follow-up visits. Measurements were performed using radiographs. The potential risk factors assessed by univariate and multivariate regression analysis were history of guided bone regeneration (GBR), prosthesis type, crown-to-implant ratio, and soft-tissue thickness.
Results: In total, 105 implants in 78 patients were included. Mean follow-up period was 22.27±9.69 months, and mean cumulative peri-implant bone loss during follow-up was 0.13±0.19 mm (range, 0.0∼0.83 mm). MBL risk did not increase significantly according to a history of GBR, prosthesis type, or crown-to-implant ratio. Simple linear regression showed soft-tissue thickness was a risk factor of MBL. However, multiple linear regression failed to identify any significant risk factor of MBL.
Conclusions: The results of this study suggest that insufficient soft-tissue thickness is a risk factor for MBL in patients with a short implant.
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KEYWORD
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Marginal bone loss, Short implant, Soft-tissue thickness
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