Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2013 May;83(3):455-9.
doi: 10.2319/072512-605.1. Epub 2012 Nov 8.

Morphometric analysis of treatment effects of the Balters bionator in growing Class II patients

Carina Ferlin Antunes  1 , Renato Bigliazzi, Francisco Antonio Bertoz, Cristina Lúcia Feijó Ortolani, Lorenzo Franchi, Kurt Faltin Jr
Affiliations

Morphometric analysis of treatment effects of the Balters bionator in growing Class II patients

Carina Ferlin Antunes et al. Angle Orthod. 2013 May.

Abstract

Objective: To investigate the effects of the standard (Class II) Balters bionator in growing patients with Class II malocclusion with mandibular retrusion by using morphometrics (thin-plate spline [TPS] analysis).

Materials and methods: Thirty-one Class II patients (17 male and 14 female) were treated with the Balters bionator (bionator group). Mean age at the start of treatment (T0) was 10.3 years, while it was 13 years at the end of treatment (T1). Mean treatment time was 2 years and 2 months. The control group consisted of 22 subjects (14 male and 8 female) with untreated Class II malocclusion. Mean age at T0 was 10.2 years, while it was 12.2 years at T1. The observation period lasted 2 years on average. TPS analysis evaluated statistical (permutation tests) differences in the craniofacial shape and size between the bionator and control groups.

Results: Through TPS analysis (deformation grids) the bionator group showed significant shape changes in the mandible that could be described as a mandibular forward and downward displacement. The control group showed no statistically significant differences in the correction of Class II malocclusion.

Conclusions: Bionator appliance is able to induce significant mandibular shape changes that lead to the correction of Class II dentoskeletal disharmony.

PubMed Disclaimer

Figures

Figure 1.
Figure 1.
Standard or Class II Balters bionator.
Figure 2.
Figure 2.
Bionator in the oral cavity.
Figure 3.
Figure 3.
Landmarks used for morphometric analysis.
Figure 4.
Figure 4.
TPS graphical display of shape differences between T0 and T1 in the bionator group (magnification factor 3×).
Figure 5.
Figure 5.
TPS graphical display of shape differences between T0 and T1 in the control group (magnification factor 3×).
See this image and copyright information in PMC

Similar articles

See all similar articles

Cited by

See all "Cited by" articles

References

    1. Broadbent BH. A new x-ray technique and its applications to orthodontia. Angle Orthod. 1931;1:45–66.
    1. Hofrath H. Bedeutung der Röntgenfern und Abstandsaufnahme für die Diagnostik der Kieferanomalien. Fortschr Orthod. 1931;1:232–258.
    1. Moyers RE, Bookstein FL. The inappropriateness of conventional cephalometrics. Am J Orthod. 1979;75:599–617. - PubMed
    1. Bookstein FL. On the cephalometrics of skeletal change. Am J Orthod. 1982;82:177–182. - PubMed
    1. McIntyre GT, Mossey PA. Size and shape measurement in contemporary cephalometrics. Eur J Orthod. 2003;25:231–242. - PubMed

LinkOut - more resources