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. 2015 Oct;41(5):240-5.
doi: 10.5125/jkaoms.2015.41.5.240. Epub 2015 Oct 20.

Analysis of time to failure of orthodontic mini-implants after insertion or loading

Jong-Wha Jeong  1 , Jong-Wan Kim  2 , Nam-Ki Lee  2 , Young-Kyun Kim  3 , Jong-Ho Lee  4 , Tae-Woo Kim  1
Affiliations

Analysis of time to failure of orthodontic mini-implants after insertion or loading

Jong-Wha Jeong et al. J Korean Assoc Oral Maxillofac Surg. 2015 Oct.

Abstract

Objectives: This study was performed to evaluate patterns of failure time after insertion, failure rate according to loading time after insertion, and the patterns of failure after loading.

Materials and methods: A total of 331 mini-implants were classified into the non-failure group (NFG) and failure group (FG), which was divided into failed group before loading (FGB) and failed group after loading (FGA). Orthodontic force was applied to both the NFG and FGA. Failed mini-implants after insertion, ratio of FGA to NFG according to loading time after insertion, and failed mini-implants according to failed time after loading were analyzed.

Results: Percentages of failed mini-implants after insertion were 15.79%, 36.84%, 12.28%, and 10.53% at 4, 8, 12, and 16 weeks, respectively. Mini-implant failure demonstrated a peak from 4 to 5 weeks after insertion. The failure rates according to loading time after insertion were 13.56%, 8.97%, 11.32%, and 5.00% at 4, 8, 12, and 16 weeks, respectively. Percentages of failed mini-implants after loading were 13.79%, 24.14%, 20.69%, and 6.9% at 4, 8, 12, and 16 weeks, respectively.

Conclusion: Mini-implant stability is typically acquired 12 to 16 weeks after insertion, and immediate loading can cause failure of the mini-implant. Failure after loading was observed during the first 12 weeks.

Keywords: Dental implant; Immediate dental implant loading; Orthodontic anchorage procedure.

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Conflict of interest statement

Conflict of Interest: No potential conflict of interest relevant to this article was reported.

Figures

Fig. 1
Fig. 1. The diagram to explain 'failed time after insertion', 'loading time after insertion', and 'failed time after loading'.
Fig. 2
Fig. 2. The number of failed mini-implants as to the time after insertion.
Fig. 3
Fig. 3. Failure rate as to the loading time after insertion.
Fig. 4
Fig. 4. The number of failed mini-implants as to the failed time after loading.
See this image and copyright information in PMC

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