|Baltic Dental and Maxillofacial Journal|
June, 2015, Vol. 17, No. 2
The relationship between mandibular rotation and osseous structure of the TMJ in pre-surgery orthognathic patients: A cone beam CT study
Oral health related to quality of life in patients with stomatological diseases
Aspiration and Brushing Cytology in tumors and tumor-like conditions of the tongue: A Study of 27 Cases
© 2015 Stomatologija
Stomatologija 2015; 17 (2): 35-40 262 KB
Multifactorial etiology of Torus mandibularis: study of twins
Adomas Auškalnis, Vygandas Rutkūnas, Olaf Bernhardt, Mantas Šidlauskas, Loreta Šalomskienė, Nomeda Basevičienė
Objective. The aim of this study is to investigate the multifactorial etiology of mandibular tori analyzing the influence of genetics, occlusal overload, various clinical variables and their interactions.
Methods. Overall, plaster casts of 162 twins (81 twin pairs) were analyzed for the presence or absence of mandibular tori. Atypical wear facets on canine tips or incisors were recorded to diagnose bruxism. Angle Class, any kind of anterior open bite and positive, negative or flat curve of Wilson were recorded. Zygosity determination was carried out using a DNA test.
Results. Mandibular tori were found in 56.8% of the cases. In 93.6% of all monozygotic twin pairs both individuals had or did not have mandibular tori (κ=0.96±0.04; p<0.001), compared to 79.4% concordance of mandibular tori in dizygotic co-twins (κ=0.7±0.12; p<0.001). Prevalence of mandibular tori was significantly higher in the group of bruxers (67.5%) compared to non-bruxers (31.3%) (p<0.001). Significant association between mandibular tori and negative or flat curve of Wilson in the maxillary second premolars and first molars was found (OR=2.55, 95% CI (1.19-5.46), p=0.016). In all monozygotic bruxers, 97.1% showed concordance of mandibular tori presence in both co-twins compared to 78.9% dizygotic bruxers, and this difference is statistically significant (p=0.007).
Conclusion. Our results suggest that the mandibular tori are of a multifactorial origin. Mandibular tori seem to have genetic predisposition, and may be associated with teeth grinding as well as with negative or flat CW in region of maxillary second premolar and first molar.
Key words: torus mandibularis, twins, zygosity, genetic factor, bruxism
Received: 07 04 2014
Accepted for publishing: 25 06 2015
1Department of Dental and Oral Diseases, Medical Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania
2Department of Prosthodontics, Institute of Odontology, Faculty of Medicine, Vilnius university, Vilnius, Lithuania
3Department of Restorative Dentistry, Periodontology and Endodontology, Center of Oral Health, University of Greifswald, Greifswald, Germany
4Clinic of Orthodontics, Medical Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania
5Institute of Biology Systems and Genetics, Veterinary Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania
Adomas Auškalnis1 – D.D.S.
Vygandas Rutkūnas2 – assoc. prof., PhD
Olaf Bernhardt3 – prof., Dr. med. dent. Habil.
Mantas Šidlauskas4 – D.D.S.
Loreta Šalomskienė5 – PhD
Nomeda Basevičienė1 – assoc. prof., PhD
Address correspondence to Adomas Auškalnis, Department of Dental and Oral Diseases, Medical Academy, Lithuanian University of Health Sciences, Eivenių str. 2, 50009 Kaunas, Lithuania.
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