Evaluating the effect of hydrocephalus cause on the manner of changes in the effective parameters and clinical symptoms of the disease

Gholampour, Seifollah; Fatouraee, Nasser; Seddighi, Amir Saeed; Seddighi, Afsoun

doi:10.1016/j.jocn.2016.09.012

Cited by 40 publications

(59 citation statements)

References 16 publications

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“…Many non-invasive methods for measuring ICP are available [5,6], and in two recent studies, Gholampour, et al reported a non-invasive method for directly measuring cerebrospinal fluid pressure in the optic nerve sheath diameter (ONSD) and ICP via computer simulation [7,8]. However, the methods used in previous studies [5][6][7][8] are very time-consuming. Accordingly, simple, rapid and feasible noninvasive methods for estimating ICP are urgently needed.…”

Section: Discussionmentioning

confidence: 99%

Assessment of the Intra- and Inter-Observer Reliabilities of Ultrasonographically Measured Optic Nerve Sheath Diameters in Normal Adults

Wang¹,

Chen²,

Chen³

et al. 2017

Neuropsychiatry

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Objective:Previous studies have used determined the optic nerve sheath diameter (ONSD) ultrasonographically as a measure of elevated intracranial pressure. The present study was conducted to evaluate the intra-and inter-observer reliability, and therefore the clinical feasibility, of this method. Methods:Two observers independently measured the ONSD in the sagittal and transversal planes in 300 healthy adults. Each observer performed the measurements twice, and the measured values were used to calculate the intra-and inter-observer reliabilities. Intra-and inter-observer reliability was analyzed using Cronbach's alpha, Pearson's correlation coefficient and a Bland-Altman analysis, respectively. Results:The mean ONSD was 3.59 ± 0.28 mm, with a range of 2.96-4.36 mm, and the Cronbach's alpha values were 0.992 and 0.983 for observers 1 and 2, respectively. Pearson's correlation coefficient between the observers was 0.89, and a Bland-Altman analysis yielded a mean difference of 0.04 ± 0.16 mm between measurements. Conclusion:The ultrasonographic measurement of ONSD is an easily learned and reproducible technique with high intra-and inter-observer reliability. Our results provide a basis for the future clinical application of this technique.

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Section: Discussionmentioning

confidence: 99%

Assessment of the Intra- and Inter-Observer Reliabilities of Ultrasonographically Measured Optic Nerve Sheath Diameters in Normal Adults

Wang¹,

Chen²,

Chen³

et al. 2017

Neuropsychiatry

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“…2a. One of the most important issues in numerical computer simulations is to ensure the mesh convergence of responses [44][45][46][47][48]. The tetrahedral element was used for meshing the models (Fig.…”

Section: Methodsmentioning

confidence: 99%

Finite element analysis of occlusal splint therapy in patients with bruxism

Gholampour

Khanmohammadi

2019

BMC Oral Health

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Background: Bruxism is among the habits considered generally as contributory factors for temporomandibular joint (TMJ) disorders and its etiology is still controversial. Methods: Three-dimensional models of maxilla and mandible and teeth of 37 patients and 36 control subjects were created using in-vivo image data. The maximum values of stress and deformation were calculated in 21 patients six months after using a splint and compared with those in the initial conditions. Results: The maximum stresses in the jaw bone and head of mandible were respectively 4.4 and 4.1 times higher in patients than in control subjects. Similar values for deformation were 5.8 and 4.9, respectively. The maximum stress in the jaw bone and head of mandible decreased six months after splint application by up to 71.0 and 72.8%, respectively. Similar values for the maximum deformation were 80.7 and 78.7%, respectively. Following the occlusal splint therapy, the approximation of maximum deformation to the relevant values in control subjects was about 2.6 times the approximation of maximum stress to the relevant values in control subjects. The maximum stress and maximum deformation occurred in all cases in the head of the mandible and the splint had the highest effectiveness in jaw bone adjacent to the molar teeth. Conclusions: Splint acts as a stress relaxer and dissipates the extra stresses generated as well as the TMJ deformation and deviations due to bruxism. The splint also makes the bilateral and simultaneous loading possible and helps with the treatment of this disorder through regulation of bruxism by creating a biomechanical equilibrium between the physiological loading and the generated stress.

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“…women and 11 men after 6 months of using splint. Since the analyses based on FEM are among the most familiar methods for biological simulation [28][29][30][31][32][33][34][35][36][37][38][39][40][41], the assembled models were transferred finally to ABAQUS software version 6.14 (Dassault Systemes) for FE analysis. Furthermore, for comparing the results of computer simulations in patients and control subjects and also for comparing the results in patients before and after the occlusal splint therapy, three specific anatomical points of the skull of samples were used as set points to synchronize the procedures and to standardize the samples' head position.…”

Section: Methodsmentioning

confidence: 99%

“…The average force exerted by the medial pterigoid muscle and masseter muscle for both of the left and right muscles was assumed to be 50 N [20,42]. It should be noted that, according to previous studies, the force of these muscles should be applied under a particular angle to the model, as shown in Fig 2a. One of the most important issues in numerical computer simulations is to ensure the mesh convergence of responses [44][45][46][47][48]. The tetrahedral element was used for meshing the models (Fig 1c).…”

Section: Methodsmentioning

confidence: 99%

Finite element analysis of occlusal splint therapy in patients with bruxism

Gholampour

Khanmohammadi

2019

Preprint

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Background: Bruxism is among the habits considered generally as contributory factors for temporomandibular joint (TMJ) disorders and its etiology is still controversial.Methods: Three-dimensional models of maxilla and mandible and teeth of 37 patients and 36 control subjects were created using in-vivo image data. The maximum values of stress and deformation were calculated in 21 patients six months after using a splint and compared with those in the initial conditions. Results: The maximum stresses in the jaw bone and head of mandible were respectively 4.4 and 4.1 times higher in patients than in control subjects. Similar values for deformation were 5.8 and 4.9, respectively. The maximum stress in the jaw bone and head of mandible decreased six months after splint application by up to 71.0% and 72.8%, respectively. Similar values for the maximum deformation were 80.7% and 78.7%, respectively. Following the occlusal splint therapy, the approximation of maximum deformation to the relevant values in control subjects was about 2.6 times the approximation of maximum stress to the relevant values in control subjects. The maximum stress and maximum deformation occurred in all cases in the head of the mandible and the splint had the highest effectiveness in jaw bone adjacent to the molar teeth. Conclusions: Splint acts as a stress relaxer and dissipates the extra stresses generated as well as the TMJ deformation and deviations due to bruxism. The splint also makes the bilateral and simultaneous loading possible and helps with the treatment of this disorder through regulation of bruxism by creating a biomechanical equilibrium between the physiological loading and the generated stress.

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Evaluating the effect of hydrocephalus cause on the manner of changes in the effective parameters and clinical symptoms of the disease

Cited by 40 publications

References 16 publications

Assessment of the Intra- and Inter-Observer Reliabilities of Ultrasonographically Measured Optic Nerve Sheath Diameters in Normal Adults

Assessment of the Intra- and Inter-Observer Reliabilities of Ultrasonographically Measured Optic Nerve Sheath Diameters in Normal Adults

Finite element analysis of occlusal splint therapy in patients with bruxism

Finite element analysis of occlusal splint therapy in patients with bruxism

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