Biomechanics of oral mucosa

Chen, Junning; Ahmad, Rohaya; Li, Wei; Swain, Michael V.; Li, Qing

doi:10.1098/rsif.2015.0325

Cited by 104 publications

(91 citation statements)

References 235 publications

(498 reference statements)

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“…where l i are the deviatoric principal stretches obtained from the principal stretches, J 1I is the elastic volume strain, and m i , a i and D i are the parameters used in such a hyperelastic model [35]. The hyperelastic constitutive model was also proposed to fit PDL's viscoelastic behaviour [34], and has been adopted widely in dental biomechanics [11,36].…”

Section: Finite-element Modelling and Simulationmentioning

confidence: 99%

In vivo effects of different orthodontic loading on root resorption and correlation with mechanobiological stimulus in periodontal ligament

Zhong

Chen

Weinkamer

et al. 2019

J. R. Soc. Interface.

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Orthodontic root resorption is a common side effect of orthodontic therapy. It has been shown that high hydrostatic pressure in the periodontal ligament (PDL) generated by orthodontic forces will trigger recruitment of odontoclasts, leaving resorption craters on root surfaces. The patterns of resorption craters are the traces of odontoclast activity. This study aimed to investigate resorptive patterns by: (i) quantifying spatial root resorption under two different levels of in vivo orthodontic loadings using microCT imaging techniques and (ii) correlating the spatial distribution pattern of resorption craters with the induced mechanobiological stimulus field in PDL through nonlinear finite-element analysis (FEA) in silico. Results indicated that the heavy force led to a larger total resorption volume than the light force, mainly by presenting greater individual crater volumes ( p , 0.001) than increasing crater numbers, suggesting that increased mechano-stimulus predominantly boosted cellular resorption activity rather than recruiting more odontoclasts. Furthermore, buccal-cervical and lingual-apical regions in both groups were found to have significantly larger resorption volumes than other regions ( p , 0.005). These clinical observations are complemented by the FEA results, suggesting that root resorption was more likely to occur when the volume average compressive hydrostatic pressure exceeded the capillary blood pressure (4.7 kPa).

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Section: Finite-element Modelling and Simulationmentioning

confidence: 99%

In vivo effects of different orthodontic loading on root resorption and correlation with mechanobiological stimulus in periodontal ligament

Zhong

Chen

Weinkamer

et al. 2019

J. R. Soc. Interface.

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“…The material parameters reported in the literature vary considerably. This is in accordance with the fact that the modulus of elasticity of one tissue type can vary significantly between individuals and even within one individual . As a consequence, more than one set of material parameters was applied for each tissue type.…”

Section: Methodsmentioning

confidence: 99%

Simulation of the upper airways in patients with obstructive sleep apnea and nasal obstruction: A novel finite element method

Moxness

Wülker

Skallerud

et al. 2018

Laryngoscope Investig Oto

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ObjectiveTo evaluate the biomechanical properties of the soft palate and velopharynx in patients with obstructive sleep apnea (OSA) and nasal obstruction.Study designProspective experimental study.Materials and methodsTwo finite element (FE) models of the soft palate were created in six patients undergoing nasal surgery, one homogeneous model based on CT images, and one layered model based on soft tissue composition. The influence of anatomy on displacement caused by a gravitational load and closing pressure were evaluated in both models. The strains in the transverse and longitudinal direction were obtained for each patient.ResultsThe individual anatomy influences both its structural stiffness and its gravitational displacement. The soft palate width was the sole anatomical parameter correlated to the critical closing pressure, but the maximal displacement due to gravity may have a relationship to closing pressure of possibly an exponential order. The airway occlusion occurred mainly at the lateral attachments of the soft palate. The total transverse strain showed a strong correlation with maximal closing pressure. There was no relationship between the critical closing pressure and the preoperative AHI levels, or the change in AHI after surgery.ConclusionHyperelastic FE models both in the homogeneous and layered model represent a novel method of evaluating soft tissue biomechanics of the upper airway. The obstruction occurs mainly at the level of the lateral attachments to the pharyngeal wall, and the width of the soft palate is an indicator of the degree of critical closing pressure. A less negative closing pressure corresponds to small total transverse strain. The effect of nasal surgery on OSA is most likely not explained by change in soft palate biomechanics.Level of EvidenceNA.

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“…Chronic stresses lead to pathologic changes to oral tissues and results in loss of adaptation of denture. 1,2 Soft lining materials are viscoelastic materials used to treat these problems. Soft denture lining materials act as a cushion and reduce functional stresses created by the masticatory load.…”

Section: Introductionmentioning

confidence: 99%

Effect of Alcohol and Tea on Solubility of Soft-liner and Polymethyl Methacrylate Resin: An In Vitro Study

Choure

Sthapak

Yadav

et al. 2019

The Journal of Contemporary Dental Practice

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Aim:To evaluate solubility of soft denture liner material and acrylic denture base resin when stored in 8% and 50% concentration of alcohol and tea(with milk and green tea) at an interval of 4,7,11 and 15 days. Materials and methods:An in vitro study wasdone on 75 standardized samples in disk form (15 mm × 2 mm), each for soft-liner and acrylic denture base resin. Samples were divided into 5 groups (15 per group/per material) and stored in distilled water (A), 8% alcohol (B), 50% alcohol (C), tea with milk (D) and green tea (E). Solubility was determined at each time interval by dividing difference of weight (taken after drying the sample in a desiccator) from day 1 divided by surface area of the specimen. For each day (i.e., 4, 7, 11 and 15),one-way analysis of variance (ANOVA) test was used to determine if the distribution of mean solubility was similar in five groups followed by post-hoc Tukey's test for pair-wise comparisons.Results: Mean solubility of soft-liner was the highest tea with milk (D) followed by green tea (E), then 50% and 8 % alcohol (C and B) and was least in group A at each time of measurement. Mean solubility of an acrylic resin was highest for 8% alcohol (B) and all other groups it was similar. Conclusion:This study shows increased solubility for softliners when immersed in tea with milk, green tea, and alcohol at 8% and 50% concentration. The solubility of acrylic resin also increases at 8% alcohol concentration.Clinical significance: Drinks/beverages used in our study are commonly consumed, the results of this study caution for restricting the frequency of intake. However, this needs to be confirmed by in-vivo studies designed to prove the association of denture life with the consumption pattern of these drinks/ beverages.

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Biomechanics of oral mucosa

Cited by 104 publications

References 235 publications

In vivo effects of different orthodontic loading on root resorption and correlation with mechanobiological stimulus in periodontal ligament

In vivo effects of different orthodontic loading on root resorption and correlation with mechanobiological stimulus in periodontal ligament

Simulation of the upper airways in patients with obstructive sleep apnea and nasal obstruction: A novel finite element method

Effect of Alcohol and Tea on Solubility of Soft-liner and Polymethyl Methacrylate Resin: An In Vitro Study

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