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Ma H, Zheng T, Shao B, Liu Z. Evaluation of the effect of unilateral mastication on the morphology of temporomandibular joint from the perspective of dynamic joint space. J Oral Rehabil 2024; 51:795-804. [PMID: 38131438 DOI: 10.1111/joor.13646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Revised: 05/27/2023] [Accepted: 12/11/2023] [Indexed: 12/23/2023]
Abstract
BACKGROUND Unbalanced alterations of temporomandibular joint morphology were associated with unilaterally masticatory habits. OBJECTIVE This study aimed to investigate the effect of unilateral mastication on the remodelling of the temporomandibular joint using dynamic joint space. METHODS Twelve volunteers with non-maxillofacial deformity and healthy temporomandibular joints were recruited. The 3D models of the mandible and the maxilla were reconstructed according to computed tomography. The subjects were asked to masticate French fries and peanuts unilaterally, which was recorded by a 3D motion capture system. The dynamic joint space during unilateral mastication was analysed. RESULTS During early closure, the joint space reduction on the non-masticatory side was significantly greater than on the masticatory side (p < .05). During later closure, the joint space reduction on the non-masticatory side was significantly lower than that on the masticatory side (p < .05). The difference in joint space reduction between both sides was greater than the French fries while masticating the peanuts. CONCLUSIONS Unilateral mastication resulted in a different major pressure area on the bilateral TMJs. Therefore, unilateral mastication might be an essential factor in the bilateral asymmetrical remodelling of the TMJ.
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Affiliation(s)
- Hedi Ma
- Key Laboratory of Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin Lingang Economic and Technological Development Zone, Yibin, China
| | - Tinghui Zheng
- Key Laboratory of Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin Lingang Economic and Technological Development Zone, Yibin, China
| | - Bingmei Shao
- Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin Lingang Economic and Technological Development Zone, Yibin, China
- Basic Mechanics Lab, Sichuan University, Chengdu, China
| | - Zhan Liu
- Key Laboratory of Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin Lingang Economic and Technological Development Zone, Yibin, China
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Teng H, Shu J, Ma H, Shao B, Liu Z. Effect of pre-stress on dynamic finite element analysis of the temporomandibular joint. Comput Methods Biomech Biomed Engin 2023:1-11. [PMID: 38083841 DOI: 10.1080/10255842.2023.2290455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 11/28/2023] [Indexed: 02/24/2024]
Abstract
The pre-stress of the temporomandibular joint (TMJ) at the intercuspal position (ICP) was often neglected, which would cause errors in the finite element analysis. The purpose of this study was to investigate the effect of pre-stress on dynamic finite element analysis of the TMJs. One healthy female adult was recruited for medical imaging and motion data acquisition of the reference position (RP) to the ICP and the clicking teeth. The three-dimensional maxillofacial model including the maxilla, mandible, articular cartilages, discs, and discal attachments was reconstructed. Motion from the RP to the ICP was simulated to obtain pre-stress at the ICP. Two groups of the clicking teeth were simulated: (1) the group without pre-stress (GWoP); (2) the group with pre-stress (GwP). Significant differences were found between the two groups at the initial moment of movement, during the open-mouth phase, and during the collision phase between the upper and lower teeth. The maximum difference in the discal contact stress between both groups was even more than double. The relaxation of the TMJ at the beginning of the mouth opening was simulated in the GwP. In addition, an increase in the TMJ stress during teeth tapping was simulated in the GwP. These were not reflected in the GWoP. If pre-stress at the ICP was not considered, part of the true results would be lost. It is necessary to consider pre-stress in the dynamic finite element analysis of the TMJ.
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Affiliation(s)
- Haidong Teng
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Yibin Institute of Industrial Technology, Sichuan University Yibin Park, Yibin, China
| | - Jingheng Shu
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Yibin Institute of Industrial Technology, Sichuan University Yibin Park, Yibin, China
| | - Hedi Ma
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Yibin Institute of Industrial Technology, Sichuan University Yibin Park, Yibin, China
| | - Bingmei Shao
- Yibin Institute of Industrial Technology, Sichuan University Yibin Park, Yibin, China
- Basic Mechanics Lab, Sichuan University, Chengdu, China
| | - Zhan Liu
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Yibin Institute of Industrial Technology, Sichuan University Yibin Park, Yibin, China
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Ma H, Teng H, Li A, Zhang Z, Zheng T, Chong DYR, Shao B, Liu Z. The pressure in the temporomandibular joint in the patients with maxillofacial deformities. JOURNAL OF STOMATOLOGY, ORAL AND MAXILLOFACIAL SURGERY 2023; 124:101285. [PMID: 36087916 DOI: 10.1016/j.jormas.2022.09.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 09/05/2022] [Accepted: 09/06/2022] [Indexed: 10/14/2022]
Abstract
BACKGROUND Temporomandibular disorder (TMD) symptoms were found to be common in the patients with maxillofacial deformities. The mandibular structure was in relation with the stress within temporomandibular joint (TMJ). However, the current studies on the TMJ stresses in the patients with different maxillofacial deformities are not comprehensive enough. PURPOSE The aim of this study was to investigate the compression and morphology of the TMJ in the patients with different maxillofacial deformities under central occlusion. METHODS 24 patients and 10 asymptomatic individuals were included in this study and divided into patient groups and control group. The 3D models were reconstructed. Muscle forces and boundary conditions corresponding to the central occlusion were applied. Nine morphological parameters of mandible were evaluated. RESULTS The minimum principal stresses in the articular disc and condyle were significantly greater than those of the control group (P<0.05). For the articular disc, the compression on the non-deviation side was greater than those on the deviation side in patients with asymmetrical mandibles. There was difference between both sides in the mandibular prognathism and retrusion groups. The joint space of patients was significantly lower than that of the control group (P<0.05). CONCLUSIONS Maxillofacial deformities might change the condylar position within the articular fossa, which decreased the joint space and increased the compression within TMJ. The patients with asymmetry mandible suffered greater pressure within TMJ on the non-deviation side. The bilaterally over-developed and under-developed mandible in patients might also increase the compression within TMJ.
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Affiliation(s)
- Hedi Ma
- Key Laboratory of Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, 610065, China; Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin Lingang Economic and Technological Development Zone, Yibin, 644600, China
| | - Haidong Teng
- Key Laboratory of Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, 610065, China; Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin Lingang Economic and Technological Development Zone, Yibin, 644600, China
| | - Annan Li
- Key Laboratory of Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, 610065, China; Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin Lingang Economic and Technological Development Zone, Yibin, 644600, China
| | - Zhifei Zhang
- Department of Statistics, School of Mathematics, Southwest Jiaotong University,611756, China
| | - Tinghui Zheng
- Key Laboratory of Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, 610065, China; Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin Lingang Economic and Technological Development Zone, Yibin, 644600, China
| | - Desmond Y R Chong
- Engineering Cluster, Singapore Institute of Technology, Singapore, Singapore
| | - Bingmei Shao
- Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin Lingang Economic and Technological Development Zone, Yibin, 644600, China; Basic Mechanics Lab, Sichuan University, Chengdu, 610065, China
| | - Zhan Liu
- Key Laboratory of Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, 610065, China; Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin Lingang Economic and Technological Development Zone, Yibin, 644600, China.
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Shu J, Li A, Shao B, Chong DYR, Yao J, Liu Z. Descriptions of the dynamic joint space of the temporomandibular joint. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022; 226:107149. [PMID: 36179656 DOI: 10.1016/j.cmpb.2022.107149] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 09/05/2022] [Accepted: 09/19/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND Clinical diagnosis and treatment depended heavily on the motion analysis of the human joints. Although the dynamic joint space (DJS) of other organs was widely used in academic investigations, they were not universally used in the temporomandibular joint (TMJ) field, which was also important for the motion evaluation of the TMJ. The objectives of this study are to introduce the DJS of the TMJ and characterize the DJS regulars of mandibular movements. METHODS Ten asymptomatic subjects were selected to instruct this application. The mouth opening and closing, mandibular protrusion, and left and right protrusions, were tracked by the optical motion tracking system. According to trajectories of markers and reconstructed models from computed tomography, the motions of the mandibles could be obtained. The DJSes, which were described as the minimum Euclidian distances, were subsequently calculated based on the geometrical surfaces between the condyle and fossa during the motions. Then, the DJS map could be drawn based on the calculated values. RESULTS The DJS map manifested a decreasing trend when the condyle crossed the glenoid fossa, while it generally increased after the condyle crossed the fossa during the mouth opening. The results showed that the average maximum and minimum anterior joint spaces were 5.39 mm and 2.07 mm during mouth opening respectively with a great discrepancy existing among the subjects. The average maximum and minimum anterior joint spaces were 4.74 mm and 2.19 mm during mandibular protrusion. As for left and right protrusions, the DJS of the contralateral side was greater than that of the ipsilateral side. CONCLUSION In comparison to morphological analyses or only mandibular motions, the DJS provides more dynamic and interactive information about the TMJ. The research and methodology may help us comprehend TMJ motions and temporomandibular disorders.
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Affiliation(s)
- Jingheng Shu
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, 610065, China; Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin, 644600, China
| | - Annan Li
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, 610065, China; Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin, 644600, China
| | - Bingmei Shao
- Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin, 644600, China; Basic Mechanics Lab, Sichuan University, Chengdu, 610065, China
| | - Desmond Y R Chong
- Engineering Cluster, Singapore Institute of Technology, Singapore, 138683, Singapore
| | - Jie Yao
- School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, China
| | - Zhan Liu
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, 610065, China; Yibin Institute of Industrial Technology/Sichuan University Yibin Park, Yibin, 644600, China.
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