DOI:

10.37988/1811-153X_2022_1_74

Dentomaxillofacial growth patterns in persons with mandibular micrognathia and retrognathism

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Authors

  • M.A. Danilova 1, PhD in Medical Sciences, full professor of the Pediatric dentistry and orthodontics Department
    ORCID: 0000-0002-2746-5567
  • P.V. Ishmurzin 1, PhD in Medical science, associate professor of the Pediatric dentistry and orthodontics Department
    ORCID: 0000-0003-2344-1266
  • O.A. Megrabyan 2, PhD in Medical Sciences, orthodontist
    ORCID: 0000-0002-3461-8576
  • A.M. Konkova 3, orthodontist, head of the Orthodontic Division
    ORCID: 0000-0001-9319-6361
  • 1 Perm Sta.te Medical University, 614000, Perm, Russia
  • 2 Dental Center “32 Praktika” LLC, 614015, Perm, Russia
  • 3 “Dental Clinic No 3” LLC, 625048, Tyumen, Russia

Abstract

The purpose of this study was to evaluate growth changes of dental, skeletal and facial integument measurements in persons with distal malocclusion and mandibular micrognathia and retrognathism.
Materials and methods.
We have performed open retrospective cohort X-ray study and analyzed 98 twin lateral cephalograms recorded before and after active dentomaxillofacial growth. All persons included in thestudy had no previous orthodontic treatment. Results and discussion. Cluster analysis reviled facial skeleton type determined skeletal, dental and soft tissue features in patients with distal malocclusion and mandibular micrognathia and/ or retrognathism. 20 subjects with normo- and hypodivergent facial skeleton type have tendency to moderate lower incisor protrusion, normal lower facial height and occlusal plane inclination before active dentomaxillofacial growth. Growth pattern in this group describes synchronous maxilla and mandible growth with stable sagittal imbalance of jaws position, increased in lower incisors protrusion (by 5.7±1.2°) and decreased in chin retrusion (by 5.3±1.3 mm). 29 subjects with hyperdivergent facial skeleton type before active dentomaxillofacial growth have increased lower facial height and normal incisors inclination. Growth pattern in this group describes increase in sagittal and vertical position disproportion of jaws (by 3.2±0.8° and 5.3±1.2°, respectively), clockwise occlusal plane rotation (by 5.7±2.1°), upper and lower incisors protrusion, lower lip and chin retrusion (by 1.1±0.9 mm and 5.7±2.1 mm, respectively) and increase in lower face height.
Conclusion.
Thuswise growth pattern and dental, skeletal, facial integument features of maxillofacial complex in untreated persons with mandibular micrognathia and retrognathism are caused by initial position disproportion formed in primary dentition.

Key words:

distal malocclusion, mandibular micrognathia and retrognathism, facial skeleton architecture, dentomaxillofacial growth, dentoalveolar changes, face profile

For Citation

[1]
Danilova M.A., Ishmurzin P.V., Megrabyan O.A., Konkova A.M. Dentomaxillofacial growth patterns in persons with mandibular micrognathia and retrognathism. Clinical Dentistry (Russia).  2022; 25 (1): 74—80. DOI: 10.37988/1811-153X_2022_1_74

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Received

December 27, 2021

Accepted

March 8, 2022

Published on

March 1, 2022