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Stomatologija 2020; 22 (2): 54-7 156 KB

Heritability of mandibular asymmetries in sagittal direction: A cephalometric study

Ingrida Rakauskaite¹, Vilma Svalkauskiene¹, Zygimantas Labanauskas¹, Donata Juozėnaitė¹, Giedrė Trakinienė¹, Justina Vaiciuniene²

Summary

Aim of the work. If we figure out mandible asymmetry etiology, we can inspire further scientific research, create more effective treatment schemas and recommend means of prophylaxis that could stop mandible asymmetry development. The aim of this work was to analyze monozygotic and dizygotic twins' mandibular asymmetry in sagittal direction using cephalometric data and to analyze its dependence of genetic and environmental factors.

Material and methods. Study sample consisted of 80 dizygotic (DZ) and 80 monozygotic (MZ) twins of same sex. 3 cephalometric measurements were made to determine mandible asymmetry in sagittal direction. Indexes of mandibular asymmetry (IMA1, IMA2) were calculated. Data analysis was done using Microsoft Excel (2013). Genetic and environmental factors influencing mandible asymmetry was determined.

Results. Mandibular dental asymmetry was bigger in monozygotic twins’ group but the results were not statistically significant. Mandibular skeletal asymmetry was significantly bigger in dizygotic twins’ group: IMA1(DZ)=3.05±1.94, IMA1(MZ)=1.92±1.05, p=0.005. IMA2(DZ)=3.12±2.04, IMA2(MZ)=1.88±1.04, p=0.004. Distance between distal borders of the ramus is mostly determined by genetic factors.

Conclusions. 1. Mandibular skeletal asymmetry was significantly bigger in dizygotic twins’ group. Mandibular dental asymmetry and symmetry did not differ in groups significantly. 2. Skeletal mandible's asymmetry is more determined by genetics than environmental factors, but lower molars' sagittal position is determined more by environment.

Key words: facial asymmetry, cephalometry, mandible, twins, orthodontics.

Received: 15 03 2019

Accepted for publishing: 24 06 2020

¹Clinic of Orthodontics, Faculty of Odontology, Lithuanian University of Health Sciences, Kaunas, Lithuania.

²Private practice

Address correspondence to Vilma Svalkauskiene, Clinic of Orthodontics, Faculty of Odontology, Lithuanian University of Health Sciences, J. Lukšos-Daumanto g. 6, LT-3009 Kaunas, Lithuania.

E-mail address: vilma.svalkauskiene@gmail.com



	Baltic Dental and Maxillofacial Journal

June, 2020, Vol. 22, No. 2 CONTENTS ACTUAL REPORT Coronavirus Disease-2019 and dental practice: A project on the use of ozonized water in the water circuit of the dental armchair Elena Bardellini, Francesca Amadori, Federica Veneri, Giulio Conti, Alessandra Majorana 35-38 SCIENTIFIC ARTICLES Head and face injuries in elderly patients victims of fall. A single trauma center analysis Alidianne Fábia Cabral Cavalcanti, Sabrina da Silva Sousa Formiga, Taynná Dantas de Arruda, Rogéria Máximo de Lavôr, Christiane Leite Cavalcanti, Catarina Ribeiro Barros de Alencar, Sergio d’Avila, Alessandro Leite Cavalcanti 39-43 REVIEWS Stress and associated factors among dentists Guostė Antanavičienė, Monika Zaleckytė, Julija Narbutaitė 44-48 Enamel matrix derivate induces periodontal regeneration by activating growth factors: A review Rūta Kulakauskienė, Rokas Aukštakalnis, Renata Šadzevičienė 49-53 SCIENTIFIC ARTICLES Heritability of mandibular asymmetries in sagittal direction: A cephalometric study Ingrida Rakauskaite, Vilma Svalkauskiene, Zygimantas Labanauskas, Donata Juozėnaitė, Giedrė Trakinienė, Justina Vaiciuniene 54-57 REVIEWS Use of platelet-rich fibrin versus connective tissue graft in treatment of gingival recessions: Literature review Aušra Balčiūnaitė, Henrikas Rusilas, Juozas Žilinskas 58-64 © 2020 Stomatologija		Stomatologija 2020; 22 (2): 54-7 156 KB Heritability of mandibular asymmetries in sagittal direction: A cephalometric study Ingrida Rakauskaite¹, Vilma Svalkauskiene¹, Zygimantas Labanauskas¹, Donata Juozėnaitė¹, Giedrė Trakinienė¹, Justina Vaiciuniene² Summary Aim of the work. If we figure out mandible asymmetry etiology, we can inspire further scientific research, create more effective treatment schemas and recommend means of prophylaxis that could stop mandible asymmetry development. The aim of this work was to analyze monozygotic and dizygotic twins' mandibular asymmetry in sagittal direction using cephalometric data and to analyze its dependence of genetic and environmental factors. Material and methods. Study sample consisted of 80 dizygotic (DZ) and 80 monozygotic (MZ) twins of same sex. 3 cephalometric measurements were made to determine mandible asymmetry in sagittal direction. Indexes of mandibular asymmetry (IMA1, IMA2) were calculated. Data analysis was done using Microsoft Excel (2013). Genetic and environmental factors influencing mandible asymmetry was determined. Results. Mandibular dental asymmetry was bigger in monozygotic twins’ group but the results were not statistically significant. Mandibular skeletal asymmetry was significantly bigger in dizygotic twins’ group: IMA1(DZ)=3.05±1.94, IMA1(MZ)=1.92±1.05, p=0.005. IMA2(DZ)=3.12±2.04, IMA2(MZ)=1.88±1.04, p=0.004. Distance between distal borders of the ramus is mostly determined by genetic factors. Conclusions. 1. Mandibular skeletal asymmetry was significantly bigger in dizygotic twins’ group. Mandibular dental asymmetry and symmetry did not differ in groups significantly. 2. Skeletal mandible's asymmetry is more determined by genetics than environmental factors, but lower molars' sagittal position is determined more by environment. Key words: facial asymmetry, cephalometry, mandible, twins, orthodontics. Received: 15 03 2019 Accepted for publishing: 24 06 2020 ¹Clinic of Orthodontics, Faculty of Odontology, Lithuanian University of Health Sciences, Kaunas, Lithuania. ²Private practice Address correspondence to Vilma Svalkauskiene, Clinic of Orthodontics, Faculty of Odontology, Lithuanian University of Health Sciences, J. Lukšos-Daumanto g. 6, LT-3009 Kaunas, Lithuania. E-mail address: vilma.svalkauskiene@gmail.com