Clinical Science

Rubin, C.A.; Krishnamurthy, Natarajan; Capilouto, Eli; Huang, Yi

doi:10.1177/00220345830620021701

Cited by 138 publications

(10 citation statements)

References 21 publications

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“…Information for material properties such as the elastic modulus -E, and the Poisson’s ratio were collected from the literature [13,40–43] and summarized in Table 1. All the biological materials represented in the models were considered homogeneous, linearly elastic and isotropic.…”

Section: Methodsmentioning

confidence: 99%

Unravelling the Functional Biomechanics of Dental Features and Tooth Wear

et al. 2013

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Most of the morphological features recognized in hominin teeth, particularly the topography of the occlusal surface, are generally interpreted as an evolutionary functional adaptation for mechanical food processing. In this respect, we can also expect that the general architecture of a tooth reflects a response to withstand the high stresses produced during masticatory loadings. Here we use an engineering approach, finite element analysis (FEA), with an advanced loading concept derived from individual occlusal wear information to evaluate whether some dental traits usually found in hominin and extant great ape molars, such as the trigonid crest, the entoconid-hypoconulid crest and the protostylid have important biomechanical implications. For this purpose, FEA was applied to 3D digital models of three Gorilla gorilla lower second molars (M2) differing in wear stages. Our results show that in unworn and slightly worn M2s tensile stresses concentrate in the grooves of the occlusal surface. In such condition, the trigonid and the entoconid-hypoconulid crests act to reinforce the crown locally against stresses produced along the mesiodistal groove. Similarly, the protostylid is shaped like a buttress to suffer the high tensile stresses concentrated in the deep buccal groove. These dental traits are less functional in the worn M2, because tensile stresses decrease physiologically in the crown with progressing wear due to the enlargement of antagonistic contact areas and changes in loading direction from oblique to nearly parallel direction to the dental axis. This suggests that the wear process might have a crucial influence in the evolution and structural adaptation of molars enabling to endure bite stresses and reduce tooth failure throughout the lifetime of an individual.

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Section: Methodsmentioning

confidence: 99%

Unravelling the Functional Biomechanics of Dental Features and Tooth Wear

et al. 2013

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“…[11] The pulp was modeled as a void, since this has been shown to have no effect on the results. [12]…”

Section: Methodsmentioning

confidence: 99%

The effect of occlusal restoration and loading on the development of abfraction lesions: A finite element study

Vasudeva

Bogra

2008

J Conserv Dent

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Background:Abfraction, a type of non-carious cervical tooth loss, is a poorly understood condition. One factor thought to contribute to the development of these lesions is the effect of occlusal loading and the presence of occlusal restoration.Aim and Objectives:The aim of this paper is to study the stress profile in the cervical region of mandibular first premolar with variation of occlusal loads, and to compare the stress profile between sound and occlusally restored tooth under variation of occlusal load, using two-dimensional plane strain finite element model.Materials and Methods:A mandibular first premolar was sectioned and modeled in the finite element software, along with its peridontium. Varying occlusal loads were applied along the cuspal inclines, with and without an occlusal restoration. The software used was NISA II EMRC.Result:It was found that higher occlusal loads caused more cuspal flexure and that the maximum shear stress was much higher and closer to the cervical area. It was also observed that there was a slight increase in shear stress when occlusal restoration was present.Conclusion:It was suggested that high occlusal loading and the presence of an occlusal amalgam restoration increased the stress concentration at the cervical area, which may lead to the breakdown of enamel at the cervical region.

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“…FEA is a methodology that relies on the "discretization" of large structures to smaller elements of known size, which are net-connected and capable of being mathematically interpreted [6][7][8] . The main advantage of using FEA to evaluate the biological performance of an OMI is that this methodology is based on a virtual environment, saves time, costs, and avoids the use of animals [6][7][8][9] . The literature has shown a positive correlation between the biomechanical characteristics of OMIs and their in vivo performance 10 .…”

Section: Introductionmentioning

confidence: 99%

Insertion angle of orthodontic mini-implants and their biomechanical performance: finite element analysis

Arantes

Correa

Lunardi

et al. 2015

Rev. odontol. UNESP

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ResumoObjetivo: O objetivo deste estudo foi avaliar as tensões e deformações de duas marcas comerciais de mini-implantes ortodônticos geradas após a aplicação de dois tipos de forças (de tração de 200 gf e torção de 20 N.cm) inseridos em duas angulações (45° e 90° em relação ao osso cortical). Material e método: Modelos tridimensionais das duas marcas de mini-implantes (SIN -Sao Paulo, Brasil, e RMO -Coréia do Sul) foram construídos e analisados por análise de elementos finitos (FEA). As análises foram realizadas em simulações no osso cortical, osso esponjoso e no parafuso. Resultado: A análise FEA mostrou que os mini-implantes da marca RMO apresentaram maior deformação elástica quando submetidos à tração e as forças de torção quando comparado aos mini-implantes da marca SIN. Em ambas as marcas testadas, e para os diferentes ângulos de inserção, houve uma maior deformação do osso cortical, com maior tensão localizado no mini-implante. A tensão no mini-implante foi localizado na região do perfil transmucoso. Conclusão: Ao comparar as análises de elementos finitos das duas marcas comerciais de mini-implantes, concluiu-se que um maior número de roscas e maior inclinação resultam em menor resistência à deformação e induzem uma maior tensão no osso cortical quando submetidos à forças de torção e tração, especialmente quando inserido em um ângulo de 45º com o osso cortical.Descritores: Procedimentos de ancoragem ortodôntica; ortodontia; análise de elementos finitos. AbstractObjective: The aim of this study was to assess the stresses and strains generated after the application of two types of forces (traction of 200 gf and torsion of 20 N.cm) in two types of orthodontic mini-implants inserted at different (45° and 90° to the cortical bone) angles. Material and method: three-dimensional models of two brands of mini-implant (SIN -Sao Paulo, Brazil, and RMO -South Korea) were exported and analyzed by finite element analysis (FEA). Analyses were performed on simulations of cortical bone, cancellous bone and the screw. Result: FEA analysis showed that RMO mini-implants had greater elastic deformation when subjected to tensile and torsional forces when compared with SIN mini-implants. For both trademarks and insertion angles tested, there was greater cortical bone deformation, but with the greatest strain located on the mini-implant. Tension on the mini-implant was located in its transmucosal profile region. Conclusion: When comparing the two brands of mini-implants by FEA, it is fair to conclude that that the larger number of threads and their greater angle of inclination resulted in less resistance to deformation and induced a higher level of tension in the mini-implant and cortical bone when subjected to forces, especially when inserted at an angle of 45º to the cortical bone.

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Clinical Science

Cited by 138 publications

References 21 publications

Unravelling the Functional Biomechanics of Dental Features and Tooth Wear

Unravelling the Functional Biomechanics of Dental Features and Tooth Wear

The effect of occlusal restoration and loading on the development of abfraction lesions: A finite element study

Insertion angle of orthodontic mini-implants and their biomechanical performance: finite element analysis

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