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Baltic Dental and Maxillofacial Journal

December, 2007, Vol. 9, No. 4

CONTENTS

SCIENTIFIC ARTICLES

Effect of cyclic 3´, 5´ adenosin-monophosphate on osteogenesis embryonic bone cultivated in tissue culture: an autoradiographic study
Edvitar Leibur, Elbi Lepp
99-104

The reduction of nitroblue tetrazolium by total blood in periodontitis patients and the aged
Juozas Zilinskas, Jonas Zekonis, Gediminas Zekonis, Aiste Valantiejiene, Rima Periokaite
105-108

Validity and reproducibility of cephalometric measurements obtained from digital photographs of analogue headfilms
Simonas Grybauskas, Irena Balciuniene, Janis Vetra
114-120

Finite element analysis of stresses in the maxillary and mandibular dental arches and TMJ articular discs during clenching into maximum intercuspation, anterior and unilateral posterior occlusion
Gaivile Pileicikiene, Algimantas Surna, Rimantas Barauskas, Rimas Surna, Algidas Basevicius
121-128

Dynamics of Pregnant Women's Oral Health Status during Preventive Programme
Ingrida Vasiliauskiene, Simona Milciuviene, Egle Bendoraitiene, Julija Narbutaite, Egle Slabsinskiene, Vilija Andruskeviciene
129-136

Stomatologija 2007; 9 (4): 121-128 1057 KB

Finite element analysis of stresses in the maxillary and mandibular dental arches and TMJ articular discs during clenching into maximum intercuspation, anterior and unilateral posterior occlusion

Gaivile Pileicikiene, Algimantas Surna, Rimantas Barauskas, Rimas Surna, Algidas Basevicius

Summary

The objective of this study was to investigate distribution of stresses in the human TMJ discs, generated during clenching into various occlusal positions.

The work presents a biomechanical finite element model of interaction of mandibular and maxillary dental arches and the TMJ discs of a particular person, based on real geometrical data obtained from spiral computed tomography two-dimensional images. 3D contour coordinates - point clouds were collected from these images and solid model was created. The system under investigation consisted of eight basic parts: two rigid structures representing the mandibular and maxillary dental arches, two mandibular condyles, two mandibular fossae of temporal bone, and solid models of two articular discs. The model of maxillary dental arch was fixed in space. The model of the mandibular dental arch was able to move in space synchronically with the mandibular condyles under action of applied forces, which were considered as prescribed and known at insertion points of masticatory muscles. The motion of the mandible was constrained by interdental contact interactions and contact interaction with articular discs, which were situated in between mandibular condyles and mandibular fossae of temporal bone. The model was implemented by using LS-DYNA finite element software.

The obtained results presented a 3D view of stresses exhibited in the articular discs, as well as the real contact points of dental interactions at given masticatory geometry of a particular subject and the values of interaction forces. The expected practical value of the developed model is the facilitation of biomechanical evaluations of the influence of tolerances of teeth shapes and occlusal areas together with the supporting areas on the final stress distribution in the dental arches and articular discs.

Key words: biomechanics, mathematical model, finite element stress analysis, temporomandibular joint disc.

Received: 07 08 2007

Accepted for publishing: 21 12 2007

¹Clinic of Prosthodontics, Kaunas Medical University, Lithuani
²Kaunas University of Technology, Lithuania
³Radiology Clinic, Kaunas Medical University, Lithuania

Gaivile Pileicikiene¹ – D.D.S., assist. prof.
Algimantas Surna¹ – D.D.S., PhD, assoc. prof., Head of Clinic of Prosthodontics
Rimantas Barauskas² – Dr. habil., prof., Head of System Analysis Department
Rimas Surna² – PhD, assoc. prof.
Algidas Basevicius³ – MD, PhD, prof., Head of Radiology Clinic, Kaunas Medical University, Lithuania

Address correspondence to Gaivile Pileicikiene, Clinic of Prosthodontics, Sukileliu 51, Kaunas, Lithuania.
E-mail: gaivile@gmail.com.



	Baltic Dental and Maxillofacial Journal

December, 2007, Vol. 9, No. 4 CONTENTS SCIENTIFIC ARTICLES Effect of cyclic 3´, 5´ adenosin-monophosphate on osteogenesis embryonic bone cultivated in tissue culture: an autoradiographic study Edvitar Leibur, Elbi Lepp 99-104 The reduction of nitroblue tetrazolium by total blood in periodontitis patients and the aged Juozas Zilinskas, Jonas Zekonis, Gediminas Zekonis, Aiste Valantiejiene, Rima Periokaite 105-108 Factors related to job satisfaction among Lithuanian dentists Alina Puriene, Jadvyga Petrauskiene, Vilija Janulyte, Irena Balciuniene 109-113 Validity and reproducibility of cephalometric measurements obtained from digital photographs of analogue headfilms Simonas Grybauskas, Irena Balciuniene, Janis Vetra 114-120 Finite element analysis of stresses in the maxillary and mandibular dental arches and TMJ articular discs during clenching into maximum intercuspation, anterior and unilateral posterior occlusion Gaivile Pileicikiene, Algimantas Surna, Rimantas Barauskas, Rimas Surna, Algidas Basevicius 121-128 Dynamics of Pregnant Women's Oral Health Status during Preventive Programme Ingrida Vasiliauskiene, Simona Milciuviene, Egle Bendoraitiene, Julija Narbutaite, Egle Slabsinskiene, Vilija Andruskeviciene 129-136 © 2007 Stomatologija		Stomatologija 2007; 9 (4): 121-128 1057 KB Finite element analysis of stresses in the maxillary and mandibular dental arches and TMJ articular discs during clenching into maximum intercuspation, anterior and unilateral posterior occlusion Gaivile Pileicikiene, Algimantas Surna, Rimantas Barauskas, Rimas Surna, Algidas Basevicius Summary The objective of this study was to investigate distribution of stresses in the human TMJ discs, generated during clenching into various occlusal positions. The work presents a biomechanical finite element model of interaction of mandibular and maxillary dental arches and the TMJ discs of a particular person, based on real geometrical data obtained from spiral computed tomography two-dimensional images. 3D contour coordinates - point clouds were collected from these images and solid model was created. The system under investigation consisted of eight basic parts: two rigid structures representing the mandibular and maxillary dental arches, two mandibular condyles, two mandibular fossae of temporal bone, and solid models of two articular discs. The model of maxillary dental arch was fixed in space. The model of the mandibular dental arch was able to move in space synchronically with the mandibular condyles under action of applied forces, which were considered as prescribed and known at insertion points of masticatory muscles. The motion of the mandible was constrained by interdental contact interactions and contact interaction with articular discs, which were situated in between mandibular condyles and mandibular fossae of temporal bone. The model was implemented by using LS-DYNA finite element software. The obtained results presented a 3D view of stresses exhibited in the articular discs, as well as the real contact points of dental interactions at given masticatory geometry of a particular subject and the values of interaction forces. The expected practical value of the developed model is the facilitation of biomechanical evaluations of the influence of tolerances of teeth shapes and occlusal areas together with the supporting areas on the final stress distribution in the dental arches and articular discs. Key words: biomechanics, mathematical model, finite element stress analysis, temporomandibular joint disc. Received: 07 08 2007 Accepted for publishing: 21 12 2007 ¹Clinic of Prosthodontics, Kaunas Medical University, Lithuani ²Kaunas University of Technology, Lithuania ³Radiology Clinic, Kaunas Medical University, Lithuania Gaivile Pileicikiene¹ – D.D.S., assist. prof. Algimantas Surna¹ – D.D.S., PhD, assoc. prof., Head of Clinic of Prosthodontics Rimantas Barauskas² – Dr. habil., prof., Head of System Analysis Department Rimas Surna² – PhD, assoc. prof. Algidas Basevicius³ – MD, PhD, prof., Head of Radiology Clinic, Kaunas Medical University, Lithuania Address correspondence to Gaivile Pileicikiene, Clinic of Prosthodontics, Sukileliu 51, Kaunas, Lithuania. E-mail: gaivile@gmail.com.