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Evaluation of crown inclination and angulation after orthodontic treatment using digital models

Comparison to the prescription of the brackets used

Digitale Evaluation von Kroneninklination und -angulation nach kieferorthopädischer Behandlung

Vergleich mit der Bracket-Prescription nach Roth

  • Original Article
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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie Aims and scope Submit manuscript

Abstract

Purpose

To compare crown inclination and angulation results obtained after orthodontic treatment to the Roth prescription.

Methods

The study design was based on files and documents obtained from a database of 26 patients who had undergone orthodontic treatment using the straight-wire technique and the Roth prescription. The crown inclination and angulation were measured using a three-dimensional (3D) cephalometric module (VistaDent, Dentsply, New York, NY, USA) by an orthodontist. A coordinate system (x, y, z) was developed for each tooth that used the Andrews plane as a para-axial reference. Descriptive statistical analysis provided the mean and standard deviation (SD) of crown inclination and angulation obtained after orthodontic treatment, which were compared to the Roth prescription.

Results

Method reproducibility is an important test to investigate the margin of error and to verify the reliability of results. The results at time 1 (1.6° ± 1.1°) and time 2 (1.7° ± 1.2°) of the pilot study were not statistically different (p = 0.99). Maxillary lateral and central incisors presented significant differences in crown angulation (p < 0.05) compared to the Roth prescription. The crown angulation of maxillary second premolars with regard to the occlusal plane presented a similar value to the Roth prescription.

Conclusion

Crown inclination and angulation found at the end of orthodontic treatment did not match the prescription of the brackets for most teeth, as measured using digital models.

Zusammenfassung

Ziel

Inklination und Angulation der Zahnkronen nach kieferorthopädischer Behandlung sollten mit der Roth-Prescription verglichen werden

Methoden

In der retrospektiven Studie wurden Befunde und Datensätze von 26 Patienten ausgewertet, die in Straight-wire-Technik mit dem Roth-System behandelt worden waren. Inklination und Angulation der Kronen wurde mit einem dreidimensionalen kephalometrischen Modul (VistaDent, Dentsply, New York/NY, USA) durch einen Kieferorthopäden vermessen. Für jeden Zahn wurde ein Koordinatensystem (x, y, z) erstellt, wobei die Andrews-Ebene als paraaxiale Referenzebene diente. Mittels deskriptiver Analyse wurden nach Abschluss der kieferorthopädischen Behandlung Durchschnittswerte und Standardabweichungen (SD) von Kroneninklination und -angulation ermittelt und den vorgesehenen Werten des Roth-Systems gegenübergestellt.

Ergebnisse

Die Reproduzierbarkeit einer Methode zur prüfen ist wichtig, um die Fehlerquote zu ermitteln und ihre Verlässlichkeit zu verifizieren. In der Pilotstudie gab es zwischen den Ergebnissen zu den Zeitpunkten 1 (1,6° ± 1,1°) und 2 (1,7° ± 1,2°) keine statistisch signifikanten Unterschiede (p = 0,99). Die zentralen und lateralen Oberkieferinzisivi wiesen im Vergleich zum Roth-System signifikante Unterschiede in der Angulation auf (p < 0,05). Die Angulation der zweiten Prämolaren im Oberkiefer zeigte hinsichtlich der Okklusionsebene einen dem Roth-System ähnlichen Wert.

Schlussfolgerung

Kroneninklination und -angulation, wie sie sich nach Beendigung der kieferorthopädischen Behandlung in der Vermessung digitaler Modelle darstellten, entsprach bei den meisten Zähnen nicht den Werten, die vor der Behandlung geplant waren.

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Acknowledgements

The authors would like to thank Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the financial support to this research (no. 1223742).

Funding

The work was supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) in São Paulo, Brazil.

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Authors and Affiliations

  1. School of Medicine, Departamento de Ciências Estomatológicas, Universidade Federal de Goiás, Praça Universitária s/n, Setor Universitário, 74605-220, Goiânia, GO, Brazil

    Iury Oliveira Castro DDS, MSc, PhD

  2. Private practice, Belo Horizonte, MG, Brazil

    Bruno Frazão Gribel DDS, MSc

  3. Department of Oral Science, Universidade Federal de Goiás, Goiânia, GO, Brazil

    Ana Helena Gonçalves de Alencar DDS, MSc, PhD

  4. School of Dentistry, Universidade Federal de Goiás, Goiânia, GO, Brazil

    José Valladares-Neto DDS, MSc, PhD &  Carlos Estrela DDS, MSc, PhD

Authors
  1. Iury Oliveira Castro DDS, MSc, PhD
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  2. Bruno Frazão Gribel DDS, MSc
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  3. Ana Helena Gonçalves de Alencar DDS, MSc, PhD
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  4. José Valladares-Neto DDS, MSc, PhD
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  5. Carlos Estrela DDS, MSc, PhD
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Corresponding author

Correspondence to Iury Oliveira Castro DDS, MSc, PhD.

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Conflict of interest

I.O. Castro, B. Frazão Gribel, A.H.G. Alencar, J. Valladares-Neto and C. Estrela declare that they have no competing interests.

Ethical standards

This study was approved by the Ethics Committee of Local Research (Universidade Federal de Goiás, Brazil, Proc. no. 392.806).

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Castro, I.O., Frazão Gribel, B., Alencar, A.H.G. et al. Evaluation of crown inclination and angulation after orthodontic treatment using digital models. J Orofac Orthop 79, 227–234 (2018). https://doi.org/10.1007/s00056-018-0136-2

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