A retrospective case series evaluating the outcome of implants with low primary stability

Kwan Joo Lee, Jae Kook Cha, Ignacio Sanz-Martin, Mariano Sanz, Ui Won Jung

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Objectives: There is a need of more studies on whether low primary implant stability would negatively influence the success of implant therapy. Therefore, this retrospective study analyses outcomes of implants placed with low primary stability and factors that may be related to implant failures. Material and methods: This retrospective study included 156 patients, restored with 169 implants that presented manual rotation within an observed follow-up time of a minimum of 34 days and a maximum of 9.28 years. Descriptive statistics, survival analyses (life tables and Kaplan–Meier estimates) and radiographic assessment based on marginal bone level measurements were performed. This original study was adherent to STROBE guidelines. Results: Seven implants failed in seven patients, rendering cumulative survival rates of 94.74% (95% CI: 89.11–97.50) and 94.33% (95% CI: 88.30–97.30) at implant and patient levels, respectively. Kaplan–Meier estimates showed implant loss was found only in advanced surgery group (7 implant loss in 82 implants) when compared with simple surgery group (no implant loss in 87 implants; p = 0.005). Conclusions: Within the limitations of this retrospective study, implant placement with low primary stability might not negatively affect either the survival rates or marginal bone level changes of implants provided that a protected and unloaded healing is guaranteed.

Original languageEnglish
Pages (from-to)861-871
Number of pages11
JournalClinical Oral Implants Research
Issue number9
Publication statusPublished - 2019 Sep 1

Bibliographical note

Funding Information:
Funding information This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of Science, ICT & Future Planning) (No. NRF-2017R1A2B2002537.

Publisher Copyright:
© 2019 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd

All Science Journal Classification (ASJC) codes

  • Oral Surgery


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