Abstract
Background
This study aimed to evaluate the prevalence of retained primary teeth (RPT) associated with delayed permanent tooth eruption and the factors associated with this condition in German children.
Methods
This is a cross-sectional retrospective study that evaluated panoramic radiographs from orthodontic patients. The diagnosis of RPT was established according to Nolla developmental stage. The primary tooth was considered retained when its successor permanent tooth was in Nolla stage 8, 9, or 10. Statistical analysis was performed with an α of 5% (p < 0.05).
Results
A total of 102 children (48 girls and 54 boys), and 574 primary teeth and their respective permanent successor teeth were evaluated. We classified 192 teeth as RPT. Sixty-one (59.8%) children presented one or more RPT. Gender was not significantly different between RPT and control teeth (p = 0.838; odds ratio 0.95, confidence interval 95% 0.44–2.16). In the majority of the RPT cases (68.7%), no clear cause to explain the prolonged retention was identified. The pathological problems most commonly observed with RPT were dental fillings (19.3%), followed by dental caries (4.6%), and ectopic tooth eruption (2.1%).
Conclusions
The incidence of RPT associated with delayed permanent tooth eruption in German children was high and the most common pathological condition associated with RPT was dental caries.
Zusammenfassung
Hintergrund
Ziel dieser Studie war es, die Prävalenz retinierter Milchzähne (RM) in Verbindung mit einem verzögerten Durchbruch der bleibenden Zähne und die damit verbundenen Faktoren an deutschen Kindern zu untersuchen.
Methoden
Es handelt sich um eine retrospektive Querschnittsstudie, in der Panoramaröntgenbilder von kieferorthopädischen Patienten ausgewertet wurden. Die Diagnose RM wurde anhand des Nolla-Entwicklungsstadiums gestellt. Der Milchzahn galt als retiniert, wenn der nachfolgende bleibende Zahn im Nolla-Stadium 8, 9 oder 10 war. Die statistische Analyse wurde mit einem α von 5% (p < 0,05) durchgeführt.
Ergebnisse
Insgesamt wurden 102 Kinder (48 Mädchen, 54 Jungen) und 574 Milchzähne und ihre jeweiligen bleibenden Nachfolgezähne untersucht. Wir klassifizierten 192 Zähne als RM. Einundsechzig (59,8 %) Kinder wiesen einen oder mehrere RM auf. Das Geschlecht unterschied sich nicht signifikant zwischen RM und Kontrollzähnen (p = 0,838; Odds Ratio 0,95, 95%-Konfidenzintervall 0,44‑2,16). Bei der Mehrheit der RM-Fälle (68,7 %) konnte keine eindeutige Ursache für die verlängerte Retention festgestellt werden. Die am häufigsten bei RM beobachteten pathologischen Probleme waren Zahnfüllungen (19,3 %), gefolgt von Karies (4,6 %) und ektopem Zahndurchbruch (2,1 %).
Schlussfolgerungen
Die RM-Inzidenz in Verbindung mit einem verzögerten Durchbruch der bleibenden Zähne war bei deutschen Kindern hoch, und der am häufigsten mit RM assoziierte pathologische Befund war Zahnkaries.
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Acknowledgements
The authors thank the study participants, Alexander von Humboldt Foundation—Germany, the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES-Brasil)—Finance Code 001 and—PDPG-POSDOC/Bolsa—CAPES n° 88887.755620/2022-00.
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E.C.K., C.K., and M.A.H.M.-O. conceived the idea and designed the study; E.C.K., P.P., and C.K. funding support; C.P.L., N.H.R.M., E.C.K., and F.C.H.M. trained and calibrated the examiner. S.D.H. evaluated the patients records and tabulated the data; E.C.K., F.B.F., and P.P. analyzed data; E.C.K. and C.K. supervised the sample collection. I.R.M. and M.A.H.M.-O. supervised the clinical analysis. S.D.H. and E.C.K. led the writing; all authors interpreted the data and revised the final version of the manuscript.
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S. D. Henklein, E. C. Küchler, P. Proff, C. P. Lepri, F. Baratto-Filho, N. H. R. Mattos, F. C. Hueb de Menezes, C. Kirschneck, I. R. Madalena and M. A. Hueb de Menezes-Oliveira declare that they have no competing interests.
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The research protocol was previously approved by the Ethics Committee from the University Hospital of Regensburg, Germany (ID 19-1549-101). All participants and/or legal guardians gave their written informed consent to take part in the study.
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Henklein, S.D., Küchler, E.C., Proff, P. et al. Prevalence and local causes for retention of primary teeth and the associated delayed permanent tooth eruption. J Orofac Orthop 85 (Suppl 1), 73–78 (2024). https://doi.org/10.1007/s00056-023-00479-x
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DOI: https://doi.org/10.1007/s00056-023-00479-x