Stress analysis during jaw movement based on vivo computed tomography images from patients with temporomandibular disorders

Cheng, Han-Yi; Peng, Pai; Lin, Yen-Juei; Chang, Shin-Tsu; Pan, Yung Ning; Lee, S.-C.; Ou, Keng Liang; Hsu, Wei Chun

doi:10.1016/j.ijom.2012.07.005

Cited by 18 publications

(10 citation statements)

References 33 publications

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“…In previous studies, FE models of the TMJ were developed to investigate stress and reaction forces within the TMJ during jaw opening [1,6,17,22,23], closure [17,24,25], clenching [21,26-28], and chewing [29] with active masticatory muscle forces [11,17,29] the favored method of load application. To avoid the experimentally difficult estimation of muscle forces [24], alternative loading conditions such as displacement of the condyle during clenching [10] and jaw opening [1] have been used.…”

Section: Discussionmentioning

confidence: 99%

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Effect of jaw opening on the stress pattern in a normal human articular disc: finite element analysis based on MRI images

Ren

Cheng

et al. 2014

Head Face Med

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IntroductionExcessive compressive and shear stresses are likely related to condylar resorption and disc perforation. Few studies have reported the disc displacement and deformation during jaw opening. The aim of this study was to analyze stress distribution in a normal articular disc during the jaw opening movement.MethodsBilateral MRI images were obtained from the temporomandibular joint of a healthy subject for the jaw opening displacement from 6 to 24 mm with 1 mm increments. The disc contour for the jaw opening at 6 mm was defined as the reference state, and was used to establish a two dimensional finite element model of the disc. The contours of the disc at other degrees of jaw opening were used as the displacement loading. Hyperelastic material models were applied to the anterior, intermediate and posterior parts of the disc. Stress and strain trajectories were calculated to characterize the stress/strain patterns in the disc.ResultsBoth the maximum and minimum principal stresses were negative in the intermediate zone, therefore, the intermediate zone withstood mainly compressive stress. On the contrary, the maximum and minimum principal stresses were most positive in the anterior and posterior zones, which meant that the anterior and posterior bands suffered higher tensile stresses. The different patterns of stress trajectories between the intermediate zone and the anterior and posterior bands might be attributed to the effect of fiber orientation. The compression of the intermediate zone and stretching of the anterior and posterior bands caused high shear deformation in the transition region, especially at the disc surfaces.ConclusionsThe stress and strain remained at a reasonable level during jaw opening, indicating that the disc experiences no injury during functional opening movements in a healthy temporomandibular joint.

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Section: Discussionmentioning

confidence: 99%

“…The aim of this study was to analyze the strain/stress pattern in the articular disc during jaw opening [1,6,9,10,17]. The contours of the disc at different opening distances were used as the displacement loading for FE analysis.…”

Section: Introductionmentioning

confidence: 99%

Effect of jaw opening on the stress pattern in a normal human articular disc: finite element analysis based on MRI images

Ren

Cheng

et al. 2014

Head Face Med

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“…Finite element analysis (FEA) is a useful technique for examining temperature distributions in tissues . FEA has been used to investigate biomechanical and thermal conductive behaviors in several fields under special boundary conditions . FEA can evaluate thermal damage to tissues during clinical surgery.…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8] FEA has been used to investigate biomechanical and thermal conductive behaviors in several fields under special boundary conditions. [9][10][11][12] FEA can evaluate thermal damage to tissues during clinical surgery. Therefore, we used an FEA program to investigate and compare thermal damage by an electrosurgical device containing the FLP and the untreated device.…”

Section: Introductionmentioning

confidence: 99%

Micro/nanostructured surface modification using femtosecond laser pulses on minimally invasive electrosurgical devices

Lin

et al. 2016

J Biomed Mater Res

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The purpose of the present study was to examine thermal damage and a sticking problem in the tissue after the use of a minimally invasive electrosurgical device with a nanostructured surface treatment that uses a femtosecond laser pulse (FLP) technique. To safely use an electrosurgical device in clinical surgery, it is important to decrease thermal damage to surrounding tissues. The surface characteristics and morphology of the FLP layer were evaluated using optical microscopy, scanning electron microscopy, and transmission electron microscopy; element analysis was performed using energy-dispersive X-ray spectroscopy, grazing incidence X-ray diffraction, and X-ray photoelectron spectroscopy. In the animal model, monopolar electrosurgical devices were used to create lesions in the legs of 30 adult rats. Animals were sacrificed for investigations at 0, 3, 7, 14, and 28 days postoperatively. Results indicated that the thermal damage and sticking situations were reduced significantly when a minimally invasive electrosurgical instrument with an FLP layer was used. Temperatures decreased while film thickness increased. Thermographic data revealed that surgical temperatures in an animal model were significantly lower in the FLP electrosurgical device compared with that in the untreated one. Furthermore, the FLP device created a relatively small area of thermal damage. As already mentioned, the biomedical nanostructured layer reduced thermal damage and promoted the antisticking property with the use of a minimally invasive electrosurgical device. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 865-873, 2017.

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“…Finite element method (FEM) is a useful tool for examining the temperature distributions in the tissues surrounding the surgery site including brain tissue [5,6], and it has been previously used to study biomechanical operations in different medical fields using various boundary parameters [7][8][9][10]. In addition, the three-dimensional (3D) FEM has been widely used for the thermal analysis of minimally invasive electrosurgical instruments [11], to investigate the thermal damage to tissues during clinical surgery.…”

Section: Introductionmentioning

confidence: 99%

A Potential Solution to Minimally Invasive Device for Oral Surgery: Evaluation of Surgical Outcomes in Rat

Lin

Chiang

et al. 2015

Journal of Nanomaterials

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The objective of the present research was to investigate the thermal injury in the brain after minimally invasive electrosurgery using instruments with copper-doped diamond-like carbon (DLC-Cu) surface coating. The surface morphologies of DLC-Cu thin films were characterized using scanning electron microscopy and atomic force microscopy. Three-dimensional brain models were reconstructed using magnetic resonance imaging to simulate the electrosurgical operation. In adult rats, a monopolar electrosurgical instrument coated with the DLC-Cu thin film was used to generate lesions in the brain. Animals were sacrificed for evaluations on postoperative days 0, 2, 7, and 28. Data indicated that the temperature decreased significantly when minimally invasive electrosurgical instruments with nanostructure DLC-Cu thin films were used and continued to decrease with increasing film thickness. On the other hand, the DLC-Cu-treated device created a relatively small thermal injury area and lateral thermal effect in the brain tissues. These results indicated that the DLC-Cu thin film minimized excessive thermal injury and uniformly distributed the temperature in the brain. Taken together, our study results suggest that the DLC-Cu film on copper electrode substrates is an effective means for improving the performance of electrosurgical instruments.

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Stress analysis during jaw movement based on vivo computed tomography images from patients with temporomandibular disorders

Cited by 18 publications

References 33 publications

Effect of jaw opening on the stress pattern in a normal human articular disc: finite element analysis based on MRI images

Effect of jaw opening on the stress pattern in a normal human articular disc: finite element analysis based on MRI images

Micro/nanostructured surface modification using femtosecond laser pulses on minimally invasive electrosurgical devices

A Potential Solution to Minimally Invasive Device for Oral Surgery: Evaluation of Surgical Outcomes in Rat

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