Korean J Orthod.  2008 Feb;38(1):13-30. 10.4041/kjod.2008.38.1.13.

A 3-D finite element analysis on the mandibular movement pattern and stress distribution during symphyseal widening

• Lee DH
• Hong HS
• Chae JM
• Jo JH
• Kim SC

• KMID: 1481502
• DOI: http://doi.org/10.4041/kjod.2008.38.1.13

Abstract

OBJECTIVE
The objective of this study was to evaluate the displacement pattern and the stress distribution of the finite element model 3-D visualization during symphyseal widening according to the osteotomy position, osteotomy type, and distraction device.
METHODS
The kinds of distraction devices used were tooth-borne type, hybrid type, bone-borne type and tooth-borne type 30degrees angulated, and the kinds of osteotomy design were vertical osteotomy line between the central incisors and step osteotomy line through the symphysis.
RESULTS
All reference points of the mandible including the condyles were displaced laterally irrespective of the osteotomy position, osteotomy method and distraction device. The anteroposterior or vertical displacements showed small differences between the groups. The widening pattern of the osteotomy line in the tooth-borne type of device was v shaped, and that of bone-borne type was a reverse v shape. However, the pattern in the hybrid type was parallel. The lateral displacement of the mandibular angle by the bone-borne device was more remarkable than the other types of devices. The displacement by the 30degrees angulated tooth-borne type was different between the left and right sides in both the transverse and anteroposterior aspects.
CONCLUSION
The design of the distraction devices and osteotomy line can influence the displacement pattern and the stress distribution during mandibular symphyseal distraction osteogenesis procedures.

Keyword

Symphyseal widening; Osteotomy; Distraction device; 3-D finite element analysis

MeSH Terms

Chimera
Displacement (Psychology)
Finite Element Analysis
Incisor
Mandible
Osteogenesis, Distraction
Osteotomy

Figure

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  Fig 1 Tooth-borne type distraction device.

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  Fig 2 Hybrid type distraction device.

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  Fig 3 Bone-borne type distraction device.

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  Fig 4 Tooth-borne type distraction device, horizontally angulated by 30°.

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  Fig 5 Reference points of control group.

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  Fig 6 Reference points of vertical osteotomy between lower central incisors.

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  Fig 7 Reference points of stepwise osteotomy through symphysis.

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  Fig 8 X-axis displacement of control groups (mm).

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  Fig 9 Y-axis displacement of control groups (mm).

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  Fig 10 Z-axis displacement of control groups (mm).

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  Fig 11 Displacement contour of experimental group 1 (tooth borne type in vertical osteotomy between central incisors)

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  Fig 12 Deformed and undeformed pattern of experimental group 1.

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  Fig 13 Von Mises stress contour of experimental group 1 (labial view).

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  Fig 14 Von Mises stress contour of experimental group 1 (lingual view).

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  Fig 15 X-axis displacement of groups of vertical osteotomy between central incisors (mm).

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  Fig 16 Y-axis displacement of groups of vertical osteotomy between central incisors (mm).

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  Fig 17 Z-axis displacement of groups of vertical osteotomy between central incisors (mm).

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  Fig 18 X-axis displacement of groups of stepwise osteotomy through symphysis (mm).

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  Fig 19 Y-axis displacement of groups of stepwise osteotomy through symphysis (mm).

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  Fig 20 Z-axis displacement of groups of stepwise osteotomy through symphysis (mm).

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