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Stomatologija 2009; 11 (1): 15-20 420 KB

Three-dimensional assessment of musculoskeletal features
in Class II and Class III patients

Katrina Zepa, Ilga Urtane, Zane Krisjane, Gaida Krumina

Summary

Summary

Objective: To evaluate and compare dimensional morphology of masseter and medial pterygoid muscles and mandibular skeletal parameters between subjects with skeletal Class II and Class III

Materials and Methods: The sample consisted of 13 patients with skeletal Class II and 10 patients with skeletal Class III prior to the start of combined orthodontic treatment and orthognathic surgery with correspondence to definite inclusion and exclusion criteria. Magnetic resonance imaging was performed for mandibular muscles and following 2D and 3D measurements were done: cross-sectional area (CSA), thickness, width, longitudinal dimension and volume. 3D multi-slice computed tomography investigation was performed for the assessment of skeletal mandibular parametres and following measurements were done: height of mandibular ramus, length af mandibular corpus, overall mandibular length, intergonial width. All the measurements were done bilaterally. Data were analyzed using descriptive statistics, t-test, and correlation coefficients.

Results: it was found that values of all mandibular and medial pterygoid measurements were higher in Class III subjects with statistical significance (p<0.05). There was a tendency of all masseter variables to be higher in Class III patients. Positive correlations were found between muscles' volume and CSA in both groups, muscles' volume and all mandibular parameters in Class II group, CSAs and all mandibular variables except intergonial width in Class II group.

Overall symmetry was observed between left and right sides in all muscular and mandibular measurements in both groups.

Conclusions: The data were acquired using two different imaging techniques – MRI and MSCT that can be mentioned as a novelty in this field of research. Remarkable differences were observed between study groups for both skeletal and muscular measurements.

Key words: masseter, medial pterygoid muscle, mandible, magnetic resonance, multi-slice computed tomography.

Received: 12 11 2008

Accepted for publishing: 26 03 2009

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

²Institute of Radiology, Riga Stradins University,

Katrina Zepa¹ – PhD student in orthodonics

Ilga Urtane¹ – D.D.S., DrMed, Professor, Head of Department of Orthodontics, Rigas Stradins University

Zane Krisjane¹ – PhD student in orthodontics

Gaida Krumina² – M.D.PhD., Professor, Director of Institute of Radiology

Address correspondence to: Katrina Zepa, Department of Orthodontics, Institute of Stomatology, Rigas Stradins University, 20 Dzirciema street, Riga, Latvia, LV 1007.

E-mail address: katrinazeppa@inbox.lv



	Baltic Dental and Maxillofacial Journal

March, 2009, Vol. 11, No. 1 CONTENTS ABSTRACTS The First International Baltic Ossoeintegration Academy (BOA) Congress "Thoughtful Look to the Nowadays Problems in Oral Implantology. 12-13 June 2009, Kaunas, Lithuania REVIEWS Attitudes of general dental practitioners towards endodontic standarts and adoption of new technology: Literature review Vytaute Peciuliene, Rasmute Maneliene, Saulius Drukteinis, Jurate Rimkuviene 11-14 SCIENTIFIC ARTICLES Three-dimensional assessment of musculoskeletal features in Class II and Class III patients Katrina Zepa, Ilga Urtane, Zane Krisjane, Gaida Krumina 15-20 In vitro study of microbial leakage in roots filled with EndoREZ sealer/EndoREZ® Points and AH Plus sealer/conventional gutta-percha points Saulius Drukteinis, Vytaute Peciuliene, Rasmute Maneliene, Ruta Bendinskaite 21-25 REVIEWS Occlusal features and masticatory muscles activity. A review of electromyographic studies Francesca Trovato, Bruno Orlando, Mario Bosco 26-31 SCIENTIFIC ARTICLES Three-dimensional evaluation of TMJ parameters in Class II and Class III patients Zane Krisjane, Ilga Urtane, Gaida Krumina, Katrina Zepa 32-36 CLINICAL CASE REPORTS Accessory parotid gland carcinoma ex pleomorphic adenoma. Case study diagnosed by fine needle aspiration D. Tamiolakis, T. S. Chimona, G. Georgiou, E. Proimos, S. Nikolaidou, G. Perogamvrakis, C. E. Papadakis 37-40 © 2009 Stomatologija		Stomatologija 2009; 11 (1): 15-20 420 KB Three-dimensional assessment of musculoskeletal features in Class II and Class III patients Katrina Zepa, Ilga Urtane, Zane Krisjane, Gaida Krumina Summary Summary Objective: To evaluate and compare dimensional morphology of masseter and medial pterygoid muscles and mandibular skeletal parameters between subjects with skeletal Class II and Class III Materials and Methods: The sample consisted of 13 patients with skeletal Class II and 10 patients with skeletal Class III prior to the start of combined orthodontic treatment and orthognathic surgery with correspondence to definite inclusion and exclusion criteria. Magnetic resonance imaging was performed for mandibular muscles and following 2D and 3D measurements were done: cross-sectional area (CSA), thickness, width, longitudinal dimension and volume. 3D multi-slice computed tomography investigation was performed for the assessment of skeletal mandibular parametres and following measurements were done: height of mandibular ramus, length af mandibular corpus, overall mandibular length, intergonial width. All the measurements were done bilaterally. Data were analyzed using descriptive statistics, t-test, and correlation coefficients. Results: it was found that values of all mandibular and medial pterygoid measurements were higher in Class III subjects with statistical significance (p<0.05). There was a tendency of all masseter variables to be higher in Class III patients. Positive correlations were found between muscles' volume and CSA in both groups, muscles' volume and all mandibular parameters in Class II group, CSAs and all mandibular variables except intergonial width in Class II group. Overall symmetry was observed between left and right sides in all muscular and mandibular measurements in both groups. Conclusions: The data were acquired using two different imaging techniques – MRI and MSCT that can be mentioned as a novelty in this field of research. Remarkable differences were observed between study groups for both skeletal and muscular measurements. Key words: masseter, medial pterygoid muscle, mandible, magnetic resonance, multi-slice computed tomography. Received: 12 11 2008 Accepted for publishing: 26 03 2009 ¹Department of Orthodontics, Institute of Stomatology, Riga Stradins University ²Institute of Radiology, Riga Stradins University, Katrina Zepa¹ – PhD student in orthodonics Ilga Urtane¹ – D.D.S., DrMed, Professor, Head of Department of Orthodontics, Rigas Stradins University Zane Krisjane¹ – PhD student in orthodontics Gaida Krumina² – M.D.PhD., Professor, Director of Institute of Radiology Address correspondence to: Katrina Zepa, Department of Orthodontics, Institute of Stomatology, Rigas Stradins University, 20 Dzirciema street, Riga, Latvia, LV 1007. E-mail address: katrinazeppa@inbox.lv