Journal of dental biomechanics最新文献_第4页

Quasi-static and harmonic indentation of osteonal bone. 骨的准静态和谐波压痕。

Journal of dental biomechanics Pub Date : 2010-02-17 DOI: 10.4061/2010/736830

S S Huja, J L Hay, A M Rummel, F M Beck

{"title":"Quasi-static and harmonic indentation of osteonal bone.","authors":"S S Huja, J L Hay, A M Rummel, F M Beck","doi":"10.4061/2010/736830","DOIUrl":"https://doi.org/10.4061/2010/736830","url":null,"abstract":"Unlabelled: The purpose of the study was to compare Quasi-Static (QS) and harmonic (CSM) methods of indentation testing. Bone sections were obtained from mid-femoral diaphyses of dogs which received a pair of calcein labels. Labeled (n = 35) and unlabeled (n = 112) osteons were identified. Indentation modulus (IM) and hardness (H) for the CSM method were collected during the entire loading cycle to peak depth, while IM and H for QS method were calculated at a peak depth of 500 nm.Results: The mean (SD) of the IM and H for labeled osteons were as follows: QS IM = 15.3 GPa (3.85) versus CSM IM = 14.7 GPa (3.58); P = .52 and QS H = .39 GPa (.171) versus CSM H = .42 GPa (.146); P = .32. The mean (SD) of the IM and H for unlabeled osteons were as follows: QS IM = 21.5 GPa (2.80) versus CSM IM = 20.6 GPa (2.53); P = .054 and QS H = .64 GPa (.117) versus CSM H = .70 GPa (.120); P = .017. There was no difference in IM and H for the two methods, except for H of the unlabeled osteons. In addition, for the CSM method, IM at 100 nm, 200 nm, 300 nm, 400 nm and 500 nm were not statistically significant different (P = .06). Bone is viscoelastic at an organ level. However, this component of its behavior was not detected at the length scale examined.","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"2010 ","pages":"736830"},"PeriodicalIF":0.0,"publicationDate":"2010-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2958426/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29382559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Biomechanical Response in Mandibular Bone due to Mastication Loading on 3-Unit Fixed Partial Dentures. 三单元固定局部义齿咀嚼负荷对下颌骨的生物力学响应。

Journal of dental biomechanics Pub Date : 2010-01-01 Epub Date: 2009-11-17 DOI: 10.4061/2010/902537

Clarice Field, Qing Li, Wei Li, Michael Swain

{"title":"Biomechanical Response in Mandibular Bone due to Mastication Loading on 3-Unit Fixed Partial Dentures.","authors":"Clarice Field, Qing Li, Wei Li, Michael Swain","doi":"10.4061/2010/902537","DOIUrl":"https://doi.org/10.4061/2010/902537","url":null,"abstract":"An understanding of functional responses in oral bone is a crucial component of dental biomechanics. The purpose of this study was to investigate the potential biological remodelling response during mastication on the mandibular pre- and post-insertion of a fixed partial denture (FPD). A series of three-dimensional (3D) finite element analysis (FEA) models were presented pre- and postextraction to determine the biomechanical responses to masticatory loading in the anterior mandible. Equivalent strains were analysed at lingual/buccal and mesial/distal areas of the premolar to molar region and quantified to anticipate bone remodelling response. Mandibular bone incorporating an FPD experienced substantially greater stress/strain magnitudes than that prior to placement of fixed prosthodontics, which is suggestive of engagements of bone remodelling. The results suggest similar outcomes to those reported clinically. Developing a simulation reflecting the outcomes of restorative treatment can provide meaningful insight into restorative treatment planning, clinical outcomes, and fixed prosthodontics designs.","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"2010 ","pages":"902537"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4061/2010/902537","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29380186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Coupled Nanomechanical and Raman Microspectroscopic Investigation of Human Third Molar DEJ. 人体第三磨牙DEJ的纳米力学与拉曼光谱耦合研究。

Journal of dental biomechanics Pub Date : 2010-01-01 Epub Date: 2009-08-12 DOI: 10.4061/2010/256903

R R Gallagher, M Balooch, G Balooch, R S Wilson, S J Marshall, G W Marshall

{"title":"Coupled Nanomechanical and Raman Microspectroscopic Investigation of Human Third Molar DEJ.","authors":"R R Gallagher, M Balooch, G Balooch, R S Wilson, S J Marshall, G W Marshall","doi":"10.4061/2010/256903","DOIUrl":"https://doi.org/10.4061/2010/256903","url":null,"abstract":"The dentino-enamel junction (DEJ) connects enamel, that covers the outer surface of a tooth, to a thicker underlying dentin. The DEJ is a critical interface that permits joining these materials that have widely dissimilar mechanical properties. AFM-based nanoindentation and Raman microspectroscopy were used to define the width and composition of human molar DEJ. Indentation elastic modulus and hardness of enamel, dentin, and DEJ were determined along lines of indents made at 2 μm intervals across the DEJ. Indents made at maximum loads at each end of the indent lines were used to make visible markers allowing Raman microspectroscopy at 1 μm intervals across the DEJ, while using the nanoindent markers for orientation and location. Functional DEJ width estimates were made based on results from nanoindentation and Raman microspectroscopy. DEJ width estimates ranged from 4.7 (±1.2) μm to 6.1 (±1.9) μm based on hardness and 4.9 (±1.1) μm to 6.9 (±1.9) μm based on modulus. DEJ width based on Raman peak intensity variations were 8.0 (±3.2) μm to 8.5 (±3.1) μm based on the phosphate peak, and 7.6 (±3.2) μm to 8.0 (±2.6) μm for C-H stretching mode. These estimates are in the range of DEJ width estimates reported using nanoindentation.","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"2010 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4061/2010/256903","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29356012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Mechanical strength and viscoelastic response of the periodontal ligament in relation to structure. 牙周韧带的力学强度和粘弹性响应与结构的关系。

Journal of dental biomechanics Pub Date : 2010-01-01 Epub Date: 2009-12-15 DOI: 10.4061/2010/502318

Koichiro Komatsu

{"title":"Mechanical strength and viscoelastic response of the periodontal ligament in relation to structure.","authors":"Koichiro Komatsu","doi":"10.4061/2010/502318","DOIUrl":"https://doi.org/10.4061/2010/502318","url":null,"abstract":"The mechanical strength of the periodontal ligament (PDL) was first measured as force required to extract a tooth from its socket using human specimens. Thereafter, tooth-PDL-bone preparations have extensively been used for measurement of the mechanical response of the PDL. In vitro treatments of such specimens with specific enzymes allowed one to investigate into the roles of the structural components in the mechanical support of the PDL. The viscoelastic responses of the PDL may be examined by analysis of the stress-relaxation. Video polarised microscopy suggested that the collagen molecules and fibrils in the stretched fibre bundles progressively align along the deformation direction during the relaxation. The stress-relaxation process of the PDL can be well expressed by a function with three exponential decay terms. Analysis after in vitro digestion of the collagen fibres by collagenase revealed that the collagen fibre components may play an important role in the long-term relaxation component of the stress-relaxation process of the PDL. The dynamic measurements of the viscoelastic properties of the PDL have recently suggested that the PDL can absorb more energy in compression than in shear and tension. These viscoelastic mechanisms of the PDL tissue could reduce the risk of injury to the PDL.","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"2010 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4061/2010/502318","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29352171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 61

Shrinkage Stresses Generated during Resin-Composite Applications: A Review. 树脂复合材料应用过程中产生的收缩应力:综述。

Journal of dental biomechanics Pub Date : 2010-01-01 Epub Date: 2009-09-30 DOI: 10.4061/2010/131630

Luis Felipe J Schneider, Larissa Maria Cavalcante, Nick Silikas

引用次数: 216

Measurement of orthodontic bracket tie wing elastic and plastic deformation by arch wire torque expression utilizing an optical image correlation technique. 基于光学图像相关技术的弓丝扭矩表达式测量正畸支架扎翼弹塑性变形。

Journal of dental biomechanics Pub Date : 2010-01-01 Epub Date: 2009-12-13 DOI: 10.4061/2010/397037

Ryan A Lacoursiere, David S Nobes, Darren L N Homeniuk, Jason P Carey, Hisham H Badawi, Paul W Major

引用次数: 25

Influence of Friction Resistance on Expression of Superelastic Properties of Initial NiTi Wires in "Reduced Friction" and Conventional Bracket Systems. 摩擦阻力对“减摩擦”和常规支架体系中初始NiTi丝超弹性性能表达的影响

Journal of dental biomechanics Pub Date : 2010-01-01 Epub Date: 2009-12-20 DOI: 10.4061/2010/613142

Natalie Reznikov, Gilad Har-Zion, Idit Barkana, Yosef Abed, Meir Redlich

{"title":"Influence of Friction Resistance on Expression of Superelastic Properties of Initial NiTi Wires in \"Reduced Friction\" and Conventional Bracket Systems.","authors":"Natalie Reznikov, Gilad Har-Zion, Idit Barkana, Yosef Abed, Meir Redlich","doi":"10.4061/2010/613142","DOIUrl":"https://doi.org/10.4061/2010/613142","url":null,"abstract":"Objectives. The aim of this study was to assess the influence of resistance to sliding on expression of superelastic properties of NiTi wires. Methods and Materials. A three-point bending test was performed for 0.014 NiTi wire engaged in self-ligating (Damon, SmartClip, In-Ovation) and conventional brackets (Victory) ligated with regular and reduced friction modules (Slide). The wire was deflected in the buccal direction and allowed to straighten. The maximum load, unloading plateau and unloading capacity were registered. Results. The lowest activation load was required in the active self-ligating group (In-Ovation 2.2 ± 0.4 N) and reduced friction module group (Victory/Slide 2.9 ± 0.4 N), followed by the passive self-ligating systems (Damon 3.6 ± 0.7 N, SmartClip 3.7 ± 0.4 N). Higher activation load was obtained in the conventionally ligated group (Victory/module 4.5 ± 0.4 N). Unloading plateau phase with the load magnitude ranging from 1.27 ± 0.4 N (In-Ovation) to 1.627 ± 0.4 N (Slide) was distinct in all groups but one (Victory). Conclusions. Higher friction at flanking points reduces the net force delivered by the wire. Unloading plateau phase of NiTi load-deflection curve disappears in the conventionally ligated group thus indicating to an incomplete expression of NiTi superelastic properties. A rigid passive bracket clip amplifies resistance to sliding in an active configuration and produces a permanent deflection of the wire.","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"2010 ","pages":"613142"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4061/2010/613142","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29380185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11