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Stomatologija 2015; 17 (2): 41-7 222 KB

The relationship between mandibular rotation and osseous structure of the TMJ in pre-surgery orthognathic patients: A cone beam CT study

Zane Krisjane, Ilga Urtane, Katrina Gardovska, Iveta Jankovska, Gaida Krumina

Summary

The aim of the study was to assess the relationship between vertical skeletal pattern in terms of mandibular rotation and osseous structural changes of the TMJ in pre- surgical orthognatic patients. TMJ skeletal morphology was evaluated in cone beam computer tomography images of 117 consecutive patients with Class II and Class III dentofacial deformities according to the research diagnostic criteria of the osseous components of the TMJ related to the maxillary-mandibular plane (MM) angle. The distribution of the number and percentage of joints with structural changes in Class II was markedly different in groups divided according to the MM angle. Statistically significant increase was found in the percentage of TMJ’s with osseous changes separately for each side, i.e., right (p=0.001), left (p=0.04) and both together (p=0.0001), in the Class II patient group, an increased MM angle indicated backward rotation of the mandible. In Class III patients, there were no statistically significant differences in the number of joints with TMJ structural changes. The presence of mentioned changes was asymmetrical between the left and right joints in both the Class II and Class III patient groups. In conclusion, structural changes in the osseous parts of the TMJ are more common in patients with Class II skeletal dentofacial deformities with backward rotation of the mandible than in Class III pre-surgery orthognathic patients.

Key words: TMJ, dentofacial deformities, orthognathic surgery, CBCT.

Received: 14 03 2014

Accepted for publishing: 26 06 2015

¹Department of Orthodontics, Institute of Stomatology, Rigas Stradins University, Riga, Latvia

²Faculty of Dentistry, Rigas Stradins University, Riga, Latvia 3Institute of Radiology, Riga Stradins University, Riga, Latvia

Zane Krisjane¹ – Dr. Med.

Ilga Urtane² – D.D.S., Dr. Med., professor

Katrina Gardovska¹ – PhD student in orthodonics

Iveta Jankovska¹ – Dr. Med.

Gaida Krumina¹ – M.D., PhD, professor

Address correspondence to Dr. Zane Krisjane, 20 Dzirciema street, Riga, LV 1007, Latvia.

E-mail address: krisjane.zane@inbox.lv



	Baltic Dental and Maxillofacial Journal

June, 2015, Vol. 17, No. 2 CONTENTS SCIENTIFIC ARTICLES Multifactorial etiology of Torus mandibularis: study of twins Adomas Auškalnis, Vygandas Rutkūnas, Olaf Bernhardt, Mantas Šidlauskas, Loreta Šalomskienė, Nomeda Basevičienė 35-40 The relationship between mandibular rotation and osseous structure of the TMJ in pre-surgery orthognathic patients: A cone beam CT study Zane Krisjane, Ilga Urtane, Katrina Gardovska, Iveta Jankovska, Gaida Krumina 41-47 Oral health related to quality of life in patients with stomatological diseases Carolina Amalia Barcellos Silva, Liliane Janete Grando, Sonia Maria Luckmann Fabro, Ana Lucia Schaefer Ferreira de Mello 48-53 REVIEWS Candida albicans importance to denture wearers. A literature review Alvydas Gleiznys, Eglė Zdanavičienė, Juozas Žilinskas 54-66 CASE REPORTS Aspiration and Brushing Cytology in tumors and tumor-like conditions of the tongue: A Study of 27 Cases Tamiolakis Dimitrios, Mygdakos Nikolaos, Tsamis Ioannis, Nikolaidou Sylva, Thomaidis Vasilios, Georghiou Georgios, Costopoulou Akrivi 67-72 © 2015 Stomatologija		Stomatologija 2015; 17 (2): 41-7 222 KB The relationship between mandibular rotation and osseous structure of the TMJ in pre-surgery orthognathic patients: A cone beam CT study Zane Krisjane, Ilga Urtane, Katrina Gardovska, Iveta Jankovska, Gaida Krumina Summary The aim of the study was to assess the relationship between vertical skeletal pattern in terms of mandibular rotation and osseous structural changes of the TMJ in pre- surgical orthognatic patients. TMJ skeletal morphology was evaluated in cone beam computer tomography images of 117 consecutive patients with Class II and Class III dentofacial deformities according to the research diagnostic criteria of the osseous components of the TMJ related to the maxillary-mandibular plane (MM) angle. The distribution of the number and percentage of joints with structural changes in Class II was markedly different in groups divided according to the MM angle. Statistically significant increase was found in the percentage of TMJ’s with osseous changes separately for each side, i.e., right (p=0.001), left (p=0.04) and both together (p=0.0001), in the Class II patient group, an increased MM angle indicated backward rotation of the mandible. In Class III patients, there were no statistically significant differences in the number of joints with TMJ structural changes. The presence of mentioned changes was asymmetrical between the left and right joints in both the Class II and Class III patient groups. In conclusion, structural changes in the osseous parts of the TMJ are more common in patients with Class II skeletal dentofacial deformities with backward rotation of the mandible than in Class III pre-surgery orthognathic patients. Key words: TMJ, dentofacial deformities, orthognathic surgery, CBCT. Received: 14 03 2014 Accepted for publishing: 26 06 2015 ¹Department of Orthodontics, Institute of Stomatology, Rigas Stradins University, Riga, Latvia ²Faculty of Dentistry, Rigas Stradins University, Riga, Latvia 3Institute of Radiology, Riga Stradins University, Riga, Latvia Zane Krisjane¹ – Dr. Med. Ilga Urtane² – D.D.S., Dr. Med., professor Katrina Gardovska¹ – PhD student in orthodonics Iveta Jankovska¹ – Dr. Med. Gaida Krumina¹ – M.D., PhD, professor Address correspondence to Dr. Zane Krisjane, 20 Dzirciema street, Riga, LV 1007, Latvia. E-mail address: krisjane.zane@inbox.lv