Stress analysis in single molar tooth

Merdji, Ali; Mootanah, Rajshree; Bouiadjra, B. Bachir; Benaissa, Ali; Aminallah, L.; Chikh, El Bahri Ould; Mukdadi, Sam

doi:10.1016/j.msec.2012.10.020

Cited by 38 publications

(100 citation statements)

References 31 publications

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“…Biomechanical properties of different tissues were derived measurements in literature (Table ). Each individual tissue was modelled as a homogeneous, isotropic and linear elastic material . The 3D structure was meshed in Ansys 16.0 with 450 417 nodes and 263 309 tetrahedral elements.…”

Section: Methodsmentioning

confidence: 99%

Finite element analysis on tooth and periodontal stress under simulated occlusal loads

Zhang

Cui

et al. 2017

J of Oral Rehabilitation

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The tooth stress elicited by occluding contact represents critical biomechanical information about dental health during chewing. Effects of occlusal contact on tooth stress remain obscure. In this study, a mandibular first molar finite element model was built from CT images. The effects of area size, location and direction of occlusal loading on both tooth and periodontal stresses were analysed. Results showed tooth and periodontal stress had drastically different patterns. Tooth stress value was much higher than periodontal stress value under the same task. Tooth stress concentration area and its value decreased from outside to inside. The Maximum Tooth Stress (MTS) always occurred at the loading site and a larger loading area elicited a smaller MTS value. The variation of MTS was larger when the fossa bottoms were inclined loaded than when the cusp tips were inclined loaded, larger when lingually loaded than when buccally loaded and larger when mesially loaded than when distally loaded. Distal loadings generally induced smaller Maximum Periodontal Stress (MPS) variations than the mesial loadings. These findings indicated exposure of the rational site(s) to occlusal contact should be helpful to achieve proper tooth and periodontal stress, thus to diminish loading associated structure problems.

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Section: Methodsmentioning

confidence: 99%

Finite element analysis on tooth and periodontal stress under simulated occlusal loads

Zhang

Cui

et al. 2017

J of Oral Rehabilitation

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“…With an increase in the computational power, the use of the FEM can help to simulate with a great accuracy the functioning of the human tooth. 24 Numerical and experimental studies have shown that the increased abutment angle results in more stress on the prosthesis and surrounding bone than straight abutments. However, a prosthesis with angled abutments did not show a decrease in lifetime.…”

Section: Discussionmentioning

confidence: 99%

Effect of straight and angled abutments on the strain on a zirconia crown and implant in the mandibular second molar region: a FEA-based study

Özdoğan¹,

Gökçe²,

Şahin³

2020

Mater. Tehnol.

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In a literature search no study evaluating implant-supported posterior restorations using zircon crowns with straight and angled abutments was found. In this study, the stress distribution of a zircon-crown restoration that will be prepared by using an angular and straight abutment in a mandibular second-molar deficiency, under functional forces, stress over zircon crown and environmental tissues of implant will be evaluated using the finite-element analysis (FEA) method. The FEA result showed that the use of straight implants contributes to the lowest stresses. The selection of a straight and angular abutment is very important for the balance of distributed loading.Avtorji~lanka v raziskavi`e objavljene literature na to temo niso na{li nobene {tudije, ki bi ovrednotila obnovo zob z vsadki, pri katerih so bile uporabljene cirkonske krone s pokon~nimi ali po{evnimi oporniki. V {tudiji avtorji analizirajo porazdelitev napetosti v obnovljeni cirkonski kroni, ki je bila stabilizirana z uporabo po{evnih ali pokon~nih opornikov v drugem molarnem segmentu~eljusti. S pomo~jo metode kon~nih elementov (FEA, angl.: Finite Element Analysis), so pod obremenitvijo s funkcionalnimi silami ovrednotili nastale napetosti na cirkonskih kronah in v obdajajo~em se tkivu (dlesnih). Rezultati FEA so pokazali, da uporaba pokon~nih vsadkov povzro~a manj{e napetosti. Avtorji ugotavljajo {e, da je pravilna izbira pokon~nih ali po{evnih opornikov zelo pomembna za uravnote`eno porazdelitev obremenitev. Klju~ne besede: zobni vsadek, cirkonijev oksid, analiza na osnovi metode kon~nih elementov

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“…The distribution of strain within PDL and alveolar bone during vertical load is higher in cervical area compared with apical area, and the higher density of the Sharpey's fibers in cervical third areas adapts to the higher strain of PDL and alveolar bone . Meanwhile, the distribution of stress within alveolar bone during vertical load is higher in apical area compared with cervical or middle area, while our results showed lower density of the apical Sharpey's fibers on the bone side. There was a report that a high compression load resulted in the formation of fewer PDL collagen fibers and more blood vessels, which explains the lower density of the Sharpey's fibers in apical area on the bone side.…”

Section: Discussionmentioning

confidence: 99%

“…The density differences may due to the stress and strain distribution during occlusal load. The distribution of strain within PDL and alveolar bone during vertical load is higher in cervical area compared with apical area, and the higher density of the Sharpey's fibers in cervical third areas adapts to the higher strain of PDL and alveolar bone 25,26. Meanwhile, the distribution of stress within alveolar bone during vertical load is higher in apical area compared with cervical or middle area,25 while our results showed lower density of the apical Sharpey's fibers on the bone side.…”

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confidence: 97%

Quantitative characterizations of the Sharpey’s fibers of rat molars

Liang¹,

Chang³

et al. 2019

J of Periodontal Research

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Background and objective The Sharpey's fibers of periodontal ligament (PDL) anchor the PDL to alveolar bone and cementum and are essential for the function of PDL. While qualitative analyses of the Sharpey's fibers have been widely explored, a comprehensive quantitative characterization of the Sharpey's fibers is not available. In this work, we selected rat molars as a model and comprehensively characterized the PDL Sharpey's fibers (diameter, density, length, embedding angle, and insertion angle). Materials and methods A total of 24 rat mandibular molars, eight maxillary first molars, and their surrounding alveolar bone were harvested, fixed, rendered anorganic and observed under scanning electron microscopy (SEM). The mandibles and maxillae (n = 4) were harvested, processed, sectioned, and stained with Sirius red for histological observation. SEM images were used for quantitative analyses of diameters and densities of the Sharpey's fibers, while Sirius red staining images were used to measure lengths and angles. The Sharpey's fibers were comprehensively characterized in terms of positions (cervical, middle, and apical thirds), PDL fiber groups (alveolar crest, horizontal, oblique, apical, and interradicular groups), sides (cementum and bone sides), and teeth (mandibular first, second, third molars, and maxillary first molar). Results Our results showed that the characteristic parameters of the Sharpey's fibers varied in different positions, fiber groups, sides, and teeth. Specifically, the median diameter of the Sharpey's fibers on the bone side was significantly greater than that on the cementum side, while the median density of the Sharpey's fibers on the bone side was significantly lower than that on the cementum side, regardless of the positions and teeth. For the same tooth, the median length of the embedded Sharpey's fibers on the bone side was more than two times greater than that on the cementum side. Among all fiber groups, the alveolar crest group had the maximum length of the Sharpey's fibers on the bone side and the minimal length of the Sharpey's fibers on the cementum side. There is an approximate 5‐15° difference between the embedding angle and the insertion angle in each group. The oblique group had the smallest embedding angles on both the bone and cementum sides. Conclusion This study provides a comprehensive and quantitative characterization of the Sharpey's fibers using rat molars as a model. Overall, these parameters varied according to different vertical positions, fiber groups, teeth, and jawbones. The quantitative information of the Sharpey's fibers presented in this work facilitates our understanding of PDL functions and advances the development of biomimetic materials for periodontal tissue regeneration.

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Stress analysis in single molar tooth

Cited by 38 publications

References 31 publications

Finite element analysis on tooth and periodontal stress under simulated occlusal loads

Finite element analysis on tooth and periodontal stress under simulated occlusal loads

Effect of straight and angled abutments on the strain on a zirconia crown and implant in the mandibular second molar region: a FEA-based study

Quantitative characterizations of the Sharpey’s fibers of rat molars

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