Journal of dental biomechanics最新文献_第2页

Mechanical evaluation of five flowable resin composites by the dynamic micro-indentation method. 动态微压痕法评价五种可流动树脂复合材料的力学性能。

Journal of dental biomechanics Pub Date : 2014-05-02 eCollection Date: 2014-01-01 DOI: 10.1177/1758736014533983

Satoshi Hirayama, Hirotoshi Iwai, Yasuhiro Tanimoto

引用次数: 17

Comparison of mechanical property and role between enamel and dentin in the human teeth. 牙釉质与牙本质在人类牙齿中的力学性能及作用比较。

Journal of dental biomechanics Pub Date : 2014-02-06 eCollection Date: 2014-01-01 DOI: 10.1177/1758736014520809

Kj Chun, Hh Choi, Jy Lee

{"title":"Comparison of mechanical property and role between enamel and dentin in the human teeth.","authors":"Kj Chun, Hh Choi, Jy Lee","doi":"10.1177/1758736014520809","DOIUrl":"https://doi.org/10.1177/1758736014520809","url":null,"abstract":"The mechanical properties of enamel and dentin were studied using test specimens having the same shape and dimensions because these properties might vary with the experimental conditions and specimen shapes and dimensions. Healthy human teeth were used as specimens for mechanical tests. The stress (MPa), strain (%), and elastic modulus (E, MPa) of the specimens were obtained from compression tests. The maximum stresses of the enamel, dentin, and enamel-dentin specimens were 62.2 ± 23.8, 193.7 ± 30.6, and 126.1 ± 54.6 MPa, respectively. The maximum strains of the enamel, dentin, and enamel-dentin specimens were 4.5 ± 0.8%, 11.9 ± 0.1%, and 8.7 ± 2.7%, respectively. The elastic moduli of the enamel, dentin, and enamel-dentin specimens were 1338.2 ± 307.9, 1653.7 ± 277.9, and 1628.6 ± 482.7 MPa, respectively. The measured hardness value of enamel specimens (HV = 274.8 ± 18.1) was around 4.2 times higher than that of dentin specimens (HV = 65.6 ± 3.9). Judging from the measured values of the stress and strain of enamel specimens, enamel tended to fracture earlier than dentin; therefore, it was considered more brittle than dentin. However, judging from the measured hardness values, enamel was considered harder than dentin. Therefore, enamel has higher wear resistance, making it suitable for grinding and crushing foods, and dentin has higher force resistance, making it suitable for absorbing bite forces. The different mechanical roles of enamel and dentin may arise from their different compositions and internal structures, as revealed through scanning electron micrographs of enamel and dentin. ","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"5 ","pages":"1758736014520809"},"PeriodicalIF":0.0,"publicationDate":"2014-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1758736014520809","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32137495","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: 150

Device and materials for in vitro evaluation of forces developed to teeth and periodontal structures during dental practices. 在牙科实践中用于牙齿和牙周结构的力的体外评估的装置和材料。

Journal of dental biomechanics Pub Date : 2013-09-04 eCollection Date: 2013-01-01 DOI: 10.1177/1758736013503648

Fotios D Palamidakis, Athanasia Panou, Kyriaki G Papadokostaki, George Leontakianakos, Vassilis N Stathopoulos, Evangelos G Kontakiotis

{"title":"Device and materials for in vitro evaluation of forces developed to teeth and periodontal structures during dental practices.","authors":"Fotios D Palamidakis, Athanasia Panou, Kyriaki G Papadokostaki, George Leontakianakos, Vassilis N Stathopoulos, Evangelos G Kontakiotis","doi":"10.1177/1758736013503648","DOIUrl":"https://doi.org/10.1177/1758736013503648","url":null,"abstract":"This study aimed at providing a gauge device (Ekontak et al Gauge K-Device) in order to analyze the forces applied to teeth and periodontal tissues during dental practices in vitro. This force gauge device can be used in the investigation of the possible defect generation to tooth structures when overloaded forces are applied during dental procedures in vitro. Ekontak et al Gauge K-Device consists of three units: the specimen's holder, a high-performance digital force gauge, and the support frame. The holder was fabricated by an Al alloy providing a steady detachable attachment between the specimens and the force gauge's pin connector. The clinical simulation was achieved with the use of a proper silicone material, selected to provide similar elastic behavior with the human periodontal ligament and to join the teeth inside a solid matrix of an acrylic resin. The digital force gauge is a high-speed collection and recording (1000 Hz) product coupled with data recording software. The forces developed to 15 specimens' root canals during lateral condensation and vertical compaction of cold gutta-percha obturation procedures were monitored, saved as graphs, CSV, and excel files and presented over time. The forces developed during vertical compaction (mean maximum force per obturation circle = 13.22 N) were more excessive than those during lateral condensation (mean maximum force per obturation circle = 10.14 N). In conclusion, Ekontak et al Gauge K-Device is provided as a modern gauge device, capable of performing clinical simulation in vitro, under the terms of its protocol. ","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"4 ","pages":"1758736013503648"},"PeriodicalIF":0.0,"publicationDate":"2013-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1758736013503648","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"31718960","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

A caveat concerning center of resistance. 关于阻力中心的警告。

Journal of dental biomechanics Pub Date : 2013-08-05 eCollection Date: 2013-01-01 DOI: 10.1177/1758736013499770

Henning Dathe, Hans Nägerl, Dietmar Kubein-Meesenburg

引用次数: 14

Three-dimensional deformation of orthodontic brackets. 正畸托槽的三维变形。

Journal of dental biomechanics Pub Date : 2013-06-06 Print Date: 2013-01-01 DOI: 10.1177/1758736013492529

Garrett W Melenka, David S Nobes, Paul W Major, Jason P Carey

{"title":"Three-dimensional deformation of orthodontic brackets.","authors":"Garrett W Melenka, David S Nobes, Paul W Major, Jason P Carey","doi":"10.1177/1758736013492529","DOIUrl":"https://doi.org/10.1177/1758736013492529","url":null,"abstract":"Braces are used by orthodontists to correct the misalignment of teeth in the mouth. Archwire rotation is a particular procedure used to correct tooth inclination. Wire rotation can result in deformation to the orthodontic brackets, and an orthodontic torque simulator has been designed to examine this wire-bracket interaction. An optical technique has been employed to measure the deformation due to size and geometric constraints of the orthodontic brackets. Images of orthodontic brackets are collected using a stereo microscope and two charge-coupled device cameras, and deformation of orthodontic brackets is measured using a three-dimensional digital image correlation technique. The three-dimensional deformation of orthodontic brackets will be evaluated. The repeatability of the three-dimensional digital image correlation measurement method was evaluated by performing 30 archwire rotation tests using the same bracket and archwire. Finally, five Damon 3MX and five In-Ovation R self-ligating brackets will be compared using this technique to demonstrate the effect of archwire rotation on bracket design.","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"4 ","pages":"1758736013492529"},"PeriodicalIF":0.0,"publicationDate":"2013-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/aa/3c/10.1177_1758736013492529.PMC3677359.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"31503087","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

Patient-specific finite element analysis of viscoelastic masticatory mucosa. 患者粘弹性咀嚼粘膜的有限元分析。

Journal of dental biomechanics Pub Date : 2013-04-04 Print Date: 2013-01-01 DOI: 10.1177/1758736013483298

Noriyuki Wakabayashi, Tetsuya Suzuki

引用次数: 8

Relationships between tissue properties and operational parameters of a dental handpiece during simulated cavity preparation. 在模拟腔体准备过程中，牙科机头的组织特性和操作参数之间的关系。

Journal of dental biomechanics Pub Date : 2013-01-01 Epub Date: 2013-03-25 DOI: 10.1177/1758736013483747

Hongyan Sun, Andrew Lau, Young C Heo, Lianshan Lin, Ralph Delong, Alex Fok

{"title":"Relationships between tissue properties and operational parameters of a dental handpiece during simulated cavity preparation.","authors":"Hongyan Sun, Andrew Lau, Young C Heo, Lianshan Lin, Ralph Delong, Alex Fok","doi":"10.1177/1758736013483747","DOIUrl":"https://doi.org/10.1177/1758736013483747","url":null,"abstract":"A preliminary study was conducted on the development of an intelligent dental handpiece with functionality to detect subtle changes in mechanical properties of tooth tissue during milling. Such equipment would be able to adopt changes in cutting parameters and make real-time measurements to avoid tooth tissue damage caused by overexertion and overextension of the cutting tool. A modified dental handpiece, instrumented with strain gauges, microphone, displacement sensor, and air pressure sensor, was mounted to a linear movement table and used to mill three to four cavities in >50 bovine teeth. Extracted sound frequency and density were analyzed along with force, air pressure, and displacement for correlations and trends. Experimental results showed a high correlation (coefficient close to 0.7) between the feed force, the rotational frequency, and the averaged gray scale. These results could form the basis of a feedback control system to improve the safety of dental cutting procedures. This article is written in memory of Dr Hongyan Sun, who passed away in 2011 at a young age of 37.","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":" ","pages":"1758736013483747"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3608217/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40245405","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: 3

Impact strength of denture base and reline acrylic resins: An in vitro study. 义齿基托和线系丙烯酸树脂的冲击强度:体外研究。

Journal of dental biomechanics Pub Date : 2012-01-01 Epub Date: 2012-09-12 DOI: 10.1177/1758736012459535

Ana L Machado, Bruna C Bochio, Amanda F Wady, Janaina H Jorge, Sebastião V Canevarolo, Carlos E Vergani

引用次数: 16

Finite element analysis of adhesive endo-crowns of molars at different height levels of buccally applied load. 恒磨牙粘接内冠在不同高度载荷作用下的有限元分析。

Journal of dental biomechanics Pub Date : 2012-01-01 Epub Date: 2012-08-03 DOI: 10.1177/1758736012455421

Istabrak Hasan, Matthias Frentzen, Karl-Heinz Utz, Daniel Hoyer, Alexander Langenbach, Christoph Bourauel

{"title":"Finite element analysis of adhesive endo-crowns of molars at different height levels of buccally applied load.","authors":"Istabrak Hasan, Matthias Frentzen, Karl-Heinz Utz, Daniel Hoyer, Alexander Langenbach, Christoph Bourauel","doi":"10.1177/1758736012455421","DOIUrl":"https://doi.org/10.1177/1758736012455421","url":null,"abstract":"This study aimed to evaluate the biomechanical behaviour of adhesive endo-crowns and the influence of their design on the restoration prognosis when four loading positions are applied from the restoration-tooth junction. Two three-dimensional finite element models for the lower first molar were developed: endo-crown as a monobloc and endo-crown of a primary abutment and a full crown. Four crown loading positions were considered: 5, 6, 7 and 8 mm. A force of 1400 N was applied buccally on the middle of the mesiodistal width. No differences were observed for the two endo-crowns concerning restoration displacement and the distribution of equivalent von Mises stress and total equivalent strain. Shifting the position of the applied load to 8 mm resulted in an increase in the displacement from 25 to 42 µm and an increase of equivalent von Mises stress concentration at the tooth. The height of load application on the restoration has a significant role in the prognosis of endo-crowns.","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"3 ","pages":"1758736012455421"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1758736012455421","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30860251","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: 57

Biomechanical considerations on tooth-implant supported fixed partial dentures. 牙种植体支持固定局部义齿的生物力学考虑因素。

Journal of dental biomechanics Pub Date : 2012-01-01 Epub Date: 2012-10-29 DOI: 10.1177/1758736012462025

Konstantinos X Michalakis, Pasquale Calvani, Hiroshi Hirayama

引用次数: 0