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Comparative Study
. 2018 Oct 22;19(1):42.
doi: 10.1186/s40510-018-0239-8.

Early Class III treatment with Hybrid-Hyrax - Facemask in comparison to Hybrid-Hyrax-Mentoplate - skeletal and dental outcomes

Jan H Willmann  1 , Manuel Nienkemper  2   3 , Nour Eldin Tarraf  4 , Benedict Wilmes  1 , Dieter Drescher  1
Affiliations
Comparative Study

Early Class III treatment with Hybrid-Hyrax - Facemask in comparison to Hybrid-Hyrax-Mentoplate - skeletal and dental outcomes

Jan H Willmann et al. Prog Orthod. .

Abstract

Background: Protraction of maxilla is usually the preferred and more commonly used treatment approach for skeletal Class III with a retrognathic maxilla. The aim of this study was the comparison of the skeletal and dental effects of two skeletally borne appliances for maxillary protraction: a) Hybrid-Hyrax in combination with facemask (FM), b) Hybrid-Hyrax in combination with Mentoplate (ME).

Methods: Thirty four Patients (17 facemask, 17 Mentoplate) were investigated by means of pre- and posttreatment cephalograms. The two groups matched with regard to treatment time, age gender and type of dentoskeletal deformity before treatment.

Results: Both groups showed a significant forward movement of A-point (FM GROUP: SNA + 2.23° ± 1.30°- p 0.000*; ME: 2.23° ± 1.43°- p 0.000*). B-Point showed a larger sagittal change in the FM Group (SNB 1.51° ± 1.1°- p 0.000*) compared to the ME group (SNB: - 0.30° ± 0.9°- p 0.070). The FM group showed a significant increase of the ML-NL + 1.86° ± 1.65° (p 0.000*) and NSL-ML + 1.17° ± 1.48 (p 0.006*). Upper Incisor inclination did not change significantly during treatment in both groups as well as the distance of the first upper Molar in relation to A-point.

Conclusion: Both treatments achieve comparable rates of maxillary protraction, without dentoalveolar side effects. Skeletal anchorage with symphysial plates in the mandible provides greater vertical control and might be the treatment of choice in high angle patients.

Keywords: Class III; Facemask; Mini-plates; Rapid maxillary expansion; Skeletal anchorage.

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Conflict of interest statement

Ethics approval and consent to participate

The study was approved by the local Ethical Committee.

Study ID: 6047R.

Registration-ID: 2017074350.

Consent for publication

Written informed consent was given for publication of the photos and individual person’s data.

Competing interests

Benedict Wilmes is lecturing about the Benefit system, but holds no financial interest. The other authors declare that they have no competing interests.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Figures

Fig. 1
Fig. 1
Exemplary presentation of a patient wearing a facemask (left) and a Mentoplate (right)
Fig. 2
Fig. 2
Hybrid-Hyrax- before and after maxillary expansion
Fig. 3
Fig. 3
Schematic diagram of the facemask
Fig. 4
Fig. 4
Schematic diagram of the Mentoplate
Fig. 5
Fig. 5
Cephalometric analysis, left sagittal linear measurements (TH—true horizontal; TV—true vertical); right angular measurements
See this image and copyright information in PMC

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