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Summary

The condyle has a special multidirectional capacity for the growth and adaptive remodeling of temporomandibular joint (TMJ). Being part of TMJ structure, it plays an important role in the stability of long-term treatment results for orthodontic and orthognatic patients with Class II division 1 subdivision malocclusions. Several computed tomography (CT) investigation modes have been used to evaluate the craniofacial morphology and particularly, for TMJ. Dimensional images, acquired using new generation multislice CT (MSCT) and cone beam CT scanning data, are becoming increasingly popular in the clinical work and research. The aim of the study was to develop a new CT investigation protocol for the quantification of morphological structures and skeletal landmarks of condyle, procesus condylaris and mandible. For this purpose we created two dimensional (2D) and three dimensional (3D) reconstruction images from primary axial MSCT scans using IAC review and Transparent bone programms and acquired accordant measurements of condylar and mandibular structures. This technic allowed to get truly volumetric reflexion of the joint components in its real anatomical size and avoided the bony superimpositions. Our material included 12 patients with skeletal Class II division 1 subdivision malocclusion who had indications for combined orthodontic and orthognatic treatment. CT examination was performed before the start of treatment. For statistical analysis paired Student t-tests were applied to test the diferences of mean values and correlation coefficients were calculated to assess possible interrelations between measurements. The preliminary results showed weak corrrelation between condylar and mandibular measurements. More significant correlation was observed between procesus condylaris and mandible. It was a significant difference between right and left side in the height of procesus condylaris in patients without clinicaly relevant facial asymetry which could be considered in the individual planning of orthognatic treatment.

Conclusion. The developed combined 2D and 3D MSCT investigation protocol for condylar and mandibular measurements provides precise and demonstrative quantitative images of condylar and mandibular structures and its dimensional relationships., which could be qualified as informative criteria for the individual treatment planning for patients with Class II division 1 subdivision malocclusion.

Key words: condylar morphology, Class II division 1 subdivision malocclusion, 2D and 3D MSCT.

Received: 22 08 2007

Accepted for publishing: 24 09 2007

¹Department of Orthodontics, Institute of Stomatology, Riga Stradins University, Latvia
²IInstitute of Radiology, Riga Stradins University, Institute of Radiology, Latvia

Zane Krisjane¹ – postgraduate student in orthodontics
Ilga Urtane¹ – D.D.S., Dr. med., Professor and Head of Department of Orthodontics, Director of Institute of Stomatology
Gaida Krumina² – M.D., PhD., Professor, Director Institute of Radiology, Riga Stradins University
Anvita Bieza² – postgraduate student of Diagnostic Radiology
Katrina Zepa¹ – postgraduate student in orthodonics
Irena Rogovska – M.D., PhD, (University of Tampere), Medical Statistics Consultant, Institute of Stomatology, Rigas Stradins University
Address correspondence to Dr. Zane Krisjane, Department of Orthodontics, Institute of Stomatology, Riga Stradins University, 20 Dzirciema Street, Riga, Latvia, LV 1007.
E-mail: krisjane.zane@inbox.lv



	Baltic Dental and Maxillofacial Journal

September, 2007, Vol. 9, No. 3 CONTENTS SCIENTIFIC ARTICLES Condylar and mandibular morphological criteria in the 2D and 3D MSCT imaging for patients with Class II division 1 subdivision malocclusion 67-71 Occupational hazards of dental profession to psychological wellbeeing 72-78 Malocclusion and the need for orthodontic treatment in patients with temporomandibular dysfunction 79-85 The relationship between the severity of malposition of the frontal teeth and periodontal health in age 15-21 and 35-44 86-90 The influence of early orthodontic treatment on the growth of craniofacial complex in deciduous occlusion of unilateral cleft lip and palate patients 91-96 © 2007 Stomatologija		Stomatologija 2007; 9 (3): 67-71 409 KB Condylar and mandibular morphological criteria in the 2D and 3D MSCT imaging for patients with Class II division 1 subdivision malocclusion Zane Krisjane, Ilga Urtane, Gaida Krumina, Anvita Bieza, Katrina Zepa, Irena Rogovska Summary The condyle has a special multidirectional capacity for the growth and adaptive remodeling of temporomandibular joint (TMJ). Being part of TMJ structure, it plays an important role in the stability of long-term treatment results for orthodontic and orthognatic patients with Class II division 1 subdivision malocclusions. Several computed tomography (CT) investigation modes have been used to evaluate the craniofacial morphology and particularly, for TMJ. Dimensional images, acquired using new generation multislice CT (MSCT) and cone beam CT scanning data, are becoming increasingly popular in the clinical work and research. The aim of the study was to develop a new CT investigation protocol for the quantification of morphological structures and skeletal landmarks of condyle, procesus condylaris and mandible. For this purpose we created two dimensional (2D) and three dimensional (3D) reconstruction images from primary axial MSCT scans using IAC review and Transparent bone programms and acquired accordant measurements of condylar and mandibular structures. This technic allowed to get truly volumetric reflexion of the joint components in its real anatomical size and avoided the bony superimpositions. Our material included 12 patients with skeletal Class II division 1 subdivision malocclusion who had indications for combined orthodontic and orthognatic treatment. CT examination was performed before the start of treatment. For statistical analysis paired Student t-tests were applied to test the diferences of mean values and correlation coefficients were calculated to assess possible interrelations between measurements. The preliminary results showed weak corrrelation between condylar and mandibular measurements. More significant correlation was observed between procesus condylaris and mandible. It was a significant difference between right and left side in the height of procesus condylaris in patients without clinicaly relevant facial asymetry which could be considered in the individual planning of orthognatic treatment. Conclusion. The developed combined 2D and 3D MSCT investigation protocol for condylar and mandibular measurements provides precise and demonstrative quantitative images of condylar and mandibular structures and its dimensional relationships., which could be qualified as informative criteria for the individual treatment planning for patients with Class II division 1 subdivision malocclusion. Key words: condylar morphology, Class II division 1 subdivision malocclusion, 2D and 3D MSCT. Received: 22 08 2007 Accepted for publishing: 24 09 2007 ¹Department of Orthodontics, Institute of Stomatology, Riga Stradins University, Latvia ²IInstitute of Radiology, Riga Stradins University, Institute of Radiology, Latvia Zane Krisjane¹ – postgraduate student in orthodontics Ilga Urtane¹ – D.D.S., Dr. med., Professor and Head of Department of Orthodontics, Director of Institute of Stomatology Gaida Krumina² – M.D., PhD., Professor, Director Institute of Radiology, Riga Stradins University Anvita Bieza² – postgraduate student of Diagnostic Radiology Katrina Zepa¹ – postgraduate student in orthodonics Irena Rogovska – M.D., PhD, (University of Tampere), Medical Statistics Consultant, Institute of Stomatology, Rigas Stradins University Address correspondence to Dr. Zane Krisjane, Department of Orthodontics, Institute of Stomatology, Riga Stradins University, 20 Dzirciema Street, Riga, Latvia, LV 1007. E-mail: krisjane.zane@inbox.lv