Abstract
Objective
The objectives of the present study are the following: (a) to investigate limitations (bone height, proximity to nasopalatine nerve and roots) in juvenile patients, (b) to review the recommended site for surgical insertion (level of the maxillary first premolars), and (c) to reassess the rationale behind the manufacturer’s age limitation (12 years).
Patients and methods
Cone beam CT images of 100 patients aged 10 to 20 years were analyzed. Vertical bone heights were measured in the median plane as well as 3- and 6-mm paramedian along the prospective axis of insertion, at the level of the first premolars (level 0), 3 mm anterior (level 1) and 3 mm posterior (level 2). The Mann-Whitney U test was used to compare bone heights between gender groups.
Results
The risk of damage to the nasopalatine nerve is highest in the median region on level 1 (46 %). The risk was lowest in the midsagittal region on level 0 (recommended insertion site; 3 %) and level 2 (0 %), as well as paramedian on levels 0 and 2. The risk of damaging roots was irrelevant for median insertion at all levels; the only critical region was 6-mm paramedian on level 1.
Conclusions
The recommendation of surgical insertion at the level of the maxillary first premolars is still justified, but a slightly more posterior implant position might improve safety. We found no relevant growth-related changes in the vertical bone heights in the median palatal area. Thus, our data do not support the strict 12-year age restriction for palatal implants.
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Acknowledgments
We thank Kerstin Vach from the Institute of Biometry, University of Freiburg, and Jessica Hirsch from the Institute of Biometry, University of Witten/Herdecke, for statistical advice and support.
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The present study was funded by the authors’ own institution.
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The authors declare that they have no competing interests.
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The retrospective study was approved by the institutional review board of Ruhr University, Bochum, Germany [no.: 4093-11].
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For this type of study, formal consent is not required.
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Martin Kunkel and Britta A. Jung contributed equally and, therefore, share senior authorship.
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Kawa, D., Kunkel, M., Heuser, L. et al. What is the best position for palatal implants? A CBCT study on bone volume in the growing maxilla. Clin Oral Invest 21, 541–549 (2017). https://doi.org/10.1007/s00784-016-1913-1
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DOI: https://doi.org/10.1007/s00784-016-1913-1