J Dent Rehabil Appl Sci.  2020 Jun;36(2):80-87. 10.14368/jdras.2020.36.2.80.

Analysis on mandibular movement using the JT-3D system

• Song JH
• Kim RW
• Byun JJ
• Kim HJ
• Heo Yr
• Lee GJ

• KMID: 2503803
• DOI: http://doi.org/10.14368/jdras.2020.36.2.80

Abstract

Purpose
This study aims to measure the mandibular movement using JT-3D system and provide a range of mandibular movement that can serve as a good reference for diagnosing the temporomandibular disorder.
Materials and Methods
This study was conducted in 60 young male and female adults. The maximum opening and closing movement was recorded using JT-3D system, and by regarding 5 times of repetitive movement as 1 cycle of movement, total 3 cycles of movement were recorded. During the maximum opening, vertical position of lower jaw, antero-posterior position, lateral deflection position, and maximum opening distance were recorded. To evaluate the reproducibility of JT-3D system, statistical analysis were conducted (α = 0.05).
Results
During the maximum opening, the average value appeared at 31.56 mm vertically and 24.42 mm rearwardly, lateral deflection position 0.72 mm, and maximum opening distance 40.32 mm. There was no statistical significance in all measured values for three cycles of movement recorded with JT-3D system (P > 0.05).
Conclusion
During the maximum opening, the average value appeared at 0.72 mm in lateral deflection position and the maximum opening distance at 40.32 mm, and the analysis on the maximum opening of lower jaw using JT-3D system showed sufficiently reproducible results.

Keyword

mandible; condyle; masticatory system; temporomandibular disorders

Figure

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  Fig. 1 (A) JT-3D system (BioResearch Associates, Inc., Milwaukee, USA), (B) A small magnet is placed in the labial vestibule and adhered to the lower incisors or gingiva tissue when a deep bite is present, (C) Pattern graph recorded with JT-3D system (In this pattern graph, the maximum opening is 29.6 mm vertically, 20.0 mm rearwardly, 1.0 mm lateral deflection position and 35.7 mm maximum opening distance).

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  Fig. 2 Vertical maximum open position of jaw. In a total of 3 cycles, the average is 31.56 mm and standard deviation is 4.16 mm. * No statistically significant by Friedman test; No significant differences at P > 0.05.

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  Fig. 3 Antero-posterior maximum open position of jaw. In a total of 3 cycles, the average is 24.42 mm and standard deviation is 7.40 mm. * No statistically significant by One-way repeated ANOVA; No significant differences at P > 0.05.

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  Fig. 4 Lateral maximum open position of jaw. In a total of 3 cycles, the average is 0.72 mm and standard deviation is 4.25 mm. * No statistically significant by One-way repeated ANOVA; No significant differences at P > 0.05.

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  Fig. 5 Maximum jaw opening distance. In a total of 3 cycles, the average is 40.32 mm and standard deviation is 6.52 mm. * No statistically significant by Friedman test; No significant differences at P > 0.05.

Reference

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