Material properties of periodontal ligaments

Minch, Liwia

doi:10.5604/17322693.1079820

Cited by 18 publications

(10 citation statements)

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“…Under orthodontic forces, the thickness of the PDL is decreased, which causes the shift of the tooth. The PDL plays a key role in alveolar bone remodeling and resorption during tooth movements [ 1 ]. Accurate prediction of tooth mobility under functional dental loads is an open issue in dental biomechanics.…”

Section: Introductionmentioning

confidence: 99%

Tensile testing of the mechanical behavior of the human periodontal ligament

Shi

et al. 2018

BioMed Eng OnLine

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BackgroundThe periodontal ligament (PDL) plays a key role in alveolar bone remodeling and resorption during tooth movements. The prediction of tooth mobility under functional dental loads requires a deep understanding of the mechanical behavior of the PDL, which is a critical issue in dental biomechanics. This study was aimed to examine the mechanical behavior of the PDL of the maxillary central and lateral incisors from human. The experimental results can contribute to developing an accurate constitutive model of the human PDL in orthodontics.MethodsThe samples of human incisors were cut into three slices. Uniaxial tensile tests were conducted under different loading rates. The transverse sections (cervical, middle and apex) normal to the longitudinal axis of the root of the tooth were used in the uniaxial tensile tests. Based on a bilinear simplification of the stress–strain relations, the elastic modulus of the PDL was calculated. The values of the elastic modulus in different regions were compared to explore the factors that influence the mechanical behavior of the periodontal ligament.ResultsThe obtained stress–strain curves of the human PDL were characterized by a bilinear model with two moduli (E1 and E2) for quantifying the elastic behavior of the PDL from the central and lateral incisors. Statistically significant differences of the elastic modulus were observed in the cases of 1, 3, and 5 N loading levels for the different teeth (central and lateral incisors). The results showed that the mechanical property of the human incisors’ PDLs is dependent on the location of PDL (ANOVA, P = 0.022, P < 0.05). The elastic moduli at the middle planes were greater than at the cervical and apical planes. However, at the cervical, middle, and apical planes, the elastic moduli of the mesial and distal site were not significantly different (ANOVA, P = 0.804, P > 0.05).ConclusionsThe values of elastic modulus were determined in the range between 0.607 and 4.274 MPa under loads ranging from 1 to 5 N. The elastic behavior of the PDL is influenced by the loading rate, tooth type, root level, and individual variation.

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Section: Introductionmentioning

confidence: 99%

Tensile testing of the mechanical behavior of the human periodontal ligament

Shi

et al. 2018

BioMed Eng OnLine

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“…The FE models consist of five or six parts; teeth, PDL, cortical bone, cancellous bone, the temporomandibular joint (TMJ) disc, or food bolus; Table outlines element details and the corresponding material properties. Each material property was linear elastic as referred to previous papers (Minch, ; Santis, Ambrosio, & Licoais, ; Singh & Detamore, ). Compressive strength testing was performed with candy and carrot to define the food material model since they are similar in size to the FE food model, 15 mm × 23 mm × 6 mm (width × length × height) as shown in Figure .…”

Section: Methodsmentioning

confidence: 99%

An investigation into structural behaviors of skulls chewing food in different occlusal relationships using FEM

Lee

Chun

2019

Clinical & Exp Dental Res

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Objectives This study aims to investigate the effect of different occlusal relationships on skull structural and mechanical behaviors through simulation of chewing food. Methods Finite element (FE) skull models of occlusion for Class I, end‐on Class II, and full‐cusp Class II were generated. End‐on Class II and full‐cusp Class II were chosen as mild and severe Class II occlusions, respectively. A simplified food bolus was introduced between the upper and lower dentition of the right molars. Chewing food was simulated in the skulls by moving the mandible. An experiment was conducted to measure strains at selective locations and compared them to the analytical results for validation. Results In the early stages of mandibular movement, masticatory forces predicted from the skull models without food were lower than the skull models with food but increased drastically after occluding teeth full enough. As a result, the relationship between masticatory force and mandible movement shows that there is no significant difference between the skull models with food and without food in the range of human masticatory force, approximately 250 N. In all the cases of skulls including a food bolus, stress was similarly propagated from the mandible to the maxilla and concentrated in the same regions, including the mandibular notch and alveolar bone around the lower molars. Conclusion It is predicted that there is no significant difference of bite force–mandible movement relationships and stress distributions of skull and teeth, between end‐on Class II and full‐cusp Class II models. When simulating chewing activities on candy and carrot, it is also found that there is no difference of masticatory performance between Class II occlusions, from structural as well as mechanical perspectives.

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“…Skull consists of cortical bone and cancellous bone. Each part is modeled with corresponding elastic modulus and Poisson's ratio referred to de Santis et al [4] and Minch [5]. Santis et al [4] suggest stress-strain relationship of dentine and compact bone in their study.…”

Section: Materials Properties Loading and Boundary Conditionsmentioning

confidence: 99%

Analytical Study to Investigate Structural Behaviors of Skull During Mastication According to Occlusal Relationships

Lee¹,

Park²,

Kim³

2017

Modelling, Identification and Control

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This study proposes an effective modeling method to simulate masticatory action. Based on computed tomography (CT) images, finite element (FE) models of human skull with two different occlusal relationships, such as class I and end-on class II are constructed. After applied loading and boundary conditions for masticatory simulation, FE analyses are performed considering linear material properties and geometrical effect. As a result, the relationships between the mandibular movement and occlusal force of both two models show similar tendency in range of human occlusal force. However, stress distributions are different due to changes of occlusal surface. In addition, an experiment is conducted using replica skull model for the validation. The experimental results show a good agreement with the analytical results.

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Material properties of periodontal ligaments

Cited by 18 publications

References 0 publications

Tensile testing of the mechanical behavior of the human periodontal ligament

Tensile testing of the mechanical behavior of the human periodontal ligament

An investigation into structural behaviors of skulls chewing food in different occlusal relationships using FEM

Analytical Study to Investigate Structural Behaviors of Skull During Mastication According to Occlusal Relationships

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