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August 19, 2026Orthodontics and Craniofacial ResearchOpen Access

Investigation of Effects of Hybrid Hyrax‐Mentoplate Treatment in High‐Angle Class III Patients: A Three‐Dimensional, Retrospective Study

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Authors

GYGamze YıldırımEÖElvan Önem ÖzbilenFÖFulya Özdemir

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Overview

Retrospective study demonstrates favorable skeletal expansion and increased airway volume in high-angle Class III patients, indicating effective orthopedic correction without vertical worsening.

Key Points

  • To evaluate the three-dimensional skeletal, dental, and airway effects of hybrid hyrax-mentoplate (HH-M) orthopedic treatment in high-angle Class III patients using CBCT.
  • Retrospective analysis of pre-treatment (T0) and post-treatment (T1) CBCT scans from 17 compliant high-angle Class III patients (7 males, 10 females; mean age 11.7 ± 1.32 years; treatment duration 12.62 ± 1.7 months).
  • Pre- and post-treatment scans were superimposed on the cranial base using the artificial intelligence-based AMASSS module in 3D Slicer software to assess sagittal, vertical, transverse, and volumetric airway changes.
  • SNA, ANB, overjet, and occlusal plane to mandibular plane angles increased significantly (p < 0.001 for SNA, ANB, and overjet; p = 0.001 for OP-MP), while Sella-Nasion to OP and palatal plane to OP angles decreased (p = 0.008 for both).
  • All transverse linear measurements increased significantly (p < 0.05), while vertical skeletal linear measurements and overbite remained stable (p > 0.05).
  • Volumetric airway analysis demonstrated significant enlargement in both the nasopharynx (p = 0.008) and middle pharynx (p = 0.003).

Cite This Study

Yıldırım et al. (2026) studied this question.

synapsesocial.com/papers/6a85639d03308d306e2d6d38https://doi.org/10.1111/ocr.70173
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Dental and skeletal effects of non-surgical Class III treatment on cone-beam computed tomography: A systematic review2026
  2. 2Evaluation of the skeletal and dental effects of a hybrid aesthetic functional appliance (HAF) in skeletal class II division 1 malocclusion: A prospective uncontrolled clinical trial2024
  3. 3CBCT comparison of dental, dentoalveolar and skeletal treatment results of Hyrax expander and monocortical hybrid expander in late-adolescence2024
  4. 4Facial soft tissue changes following maxillary skeletal expansion and protraction in growing patients with class III malocclusion: A randomized clinical trial2025
  5. 5Long‐Term Outcomes of Class III Malocclusion Interception With Maxillary Expansion and Protraction: A 9‐Year Follow‐Up Case Report2026