Evaluation of soft-tissue artifacts when using anatomical and technical markers to measure mandibular motion

Chen, Chien Chih; Chen, Yunn Jy; Chen, Sheng‐Chang; Lin, Hsien Shu; Lu, Tung‐Wu

doi:10.1016/j.jds.2011.03.010

Cited by 16 publications

(9 citation statements)

References 29 publications

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“…The proposed method was shown to have measurement errors less than 1.0¡1.4 mm for all translations and 0.2 u ¡0.7 u for all rotations, much smaller than previously published errors associated with skin marker movement artefacts using non-contact techniques. 12 These results suggest that the method can be used to measure the in vivo kinematics of the mandible during functional activities.…”

Section: Discussionmentioning

confidence: 85%

A method for measuring three-dimensional mandibular kinematics in vivo using single-plane fluoroscopy

Chen¹,

Lin²,

Chen³

et al. 2012

Dentomaxillofacial Radiology

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Objectives: Accurate measurement of the three-dimensional (3D) motion of the mandible in vivo is essential for relevant clinical applications. Existing techniques are either of limited accuracy or require the use of transoral devices that interfere with jaw movements. This study aimed to develop further an existing method for measuring 3D, in vivo mandibular kinematics using single-plane fluoroscopy; to determine the accuracy of the method; and to demonstrate its clinical applicability via measurements on a healthy subject during opening/ closing and chewing movements. Methods: The proposed method was based on the registration of single-plane fluoroscopy images and 3D low-radiation cone beam CT data. It was validated using roentgen single-plane photogrammetric analysis at static positions and during opening/closing and chewing movements. Results: The method was found to have measurement errors of 0.1¡0.9 mm for all translations and 0.2 u ¡0.6 u for all rotations in static conditions, and of 1.0¡1.4 mm for all translations and 0.2 u ¡0.7 u for all rotations in dynamic conditions. Conclusions: The proposed method is considered an accurate method for quantifying the 3D mandibular motion in vivo. Without relying on transoral devices, the method has advantages over existing methods, especially in the assessment of patients with missing or unstable teeth, making it useful for the research and clinical assessment of the temporomandibular joint and chewing function.

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Section: Discussionmentioning

confidence: 85%

A method for measuring three-dimensional mandibular kinematics in vivo using single-plane fluoroscopy

Chen¹,

Lin²,

Chen³

et al. 2012

Dentomaxillofacial Radiology

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“…Therefore, studies have suggested to replace oral piercing device with the reference frames [21] . For which, frontonosal reference points, with the most less movement among reference points on soft tissue, are the most favorable to be used for replacing the locations with oral piercing device to position markers and to observe mandibular movements in patients with TMJ disorders [22] . The advances in the resolution and precision techniques in conebeam computed tomography (CBCT) have gradually enhanced the use of CBCT in studies involving mandibular movements.…”

Section: Differences In the References Points Between Hard And Soft Tmentioning

confidence: 99%

Comparison in mandibular movements between subjects with deep bite and normal occlusion

Yu¹

2015

JDOC

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Introduction: Orthodontic treatment in-deep bite subjects has generally been focused on the correction of excessive vertical coverage (overbite); however, the impact on functional problems following treatment has not been well evaluated. This study aimed to investigate the differences in mandibular movements between deep bite and normal occlusion, and to compare the functional changes of mandible in the subjects with deep bite before and after treatment. Methods: This study included students from School of Dentistry, China Medical University (CMU), and employees from CMU Hospital. The participants were categorized into normal bite (n=11) and deep bite (n=16) groups. Considering the clinical practicability, convenience and affordability, Digi Gnatho software (Japan), was used to analyze mandibular movements recorded by digital video camera. Results: No significant difference was observed in the left side masticatory movements between two groups. Significant difference was only detected in the horizontal direction of right side mastication. All of the velocities and masticatory cycle duration of both sides showed no difference. In the mandibular border movements, protrusive movements in deep-bite group were distinct from normal occlusion group. Normal occlusion group had a larger range of mandibular movements compared to deep bite group. Conclusions: Different degrees of vertical coverage of the incisors not only presented differences in the ranges of masticatory movements and border movements, but also had an impact on the final occlusal phase of mastication.

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“…24,25 For more widespread application of these systems, techniques using commercially available skin-marker-based stereophotogrammetric systems were also developed. In order to avoid skin-movement artifacts, i.e., errors associated with skin-marker movements relative to the underlying bones, 26 transoral devices are used. However, transoral devices may affect the natural motion of the TMJ, which will be negatively affected if the participant was asked to perform other more natural, clinically relevant movements, such as chewing.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of differential quantification of 3D temporomandibular kinematics during various oral activities using a cone-beam computed tomography-based 3D fluoroscopic method

Chen

Lin

et al. 2013

Journal of Dental Sciences

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Background/purpose: The measurement of mandibular kinematics is critical for studying the function of the temporomandibular joint (TMJ) and for relevant clinical applications. However, none of the existing methods allows the measurement of three-dimensional (3D) in vivo motion of the joint during dynamic functional movements without artifactual interference. The purpose of this study was to demonstrate the feasibility of a newly developed cone-beam computed tomography (CBCT)-based 3D fluoroscopic method in differentiating rigid-body kinematics of the TMJ during various functional activities. Materials and methods: One healthy individual was asked to undergo a CBCT scan and fluoroscopic imaging of her mandible and maxilla during various functional activities. CBCT-based 3D fluoroscopy was used to measure the 3D kinematics of the TMJ. Results: The 3D rigid-body kinematics of the mandible, movement trajectories of the centers of the TMJ and the midpoint of the interincisal edge were measured during functional activities. Conclusion: A new CBCT-based 3D fluoroscopic method was proposed and shown to be capable of quantitatively differentiating TMJ movement patterns among complicated functional activities. It also enabled a complete description of the rigid-body mandibular motion and descriptions of as many reference points as needed for future clinical applications. It will be helpful for dental practice and for a better understanding of the functions of the TMJ.

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Evaluation of soft-tissue artifacts when using anatomical and technical markers to measure mandibular motion

Cited by 16 publications

References 29 publications

A method for measuring three-dimensional mandibular kinematics in vivo using single-plane fluoroscopy

A method for measuring three-dimensional mandibular kinematics in vivo using single-plane fluoroscopy

Comparison in mandibular movements between subjects with deep bite and normal occlusion

Feasibility of differential quantification of 3D temporomandibular kinematics during various oral activities using a cone-beam computed tomography-based 3D fluoroscopic method

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