Journal of dental biomechanics最新文献

Effect of attachment type on load distribution to implant abutments and the residual ridge in mandibular implant-supported overdentures. 附着体类型对下颌种植覆盖义齿基牙负荷分布及残嵴的影响。

Journal of dental biomechanics Pub Date : 2015-03-16 eCollection Date: 2015-01-01 DOI: 10.1177/1758736015576009

Nobuhiro Yoda, Yoshiki Matsudate, Masaru Abue, Guang Hong, Keiichi Sasaki

{"title":"Effect of attachment type on load distribution to implant abutments and the residual ridge in mandibular implant-supported overdentures.","authors":"Nobuhiro Yoda, Yoshiki Matsudate, Masaru Abue, Guang Hong, Keiichi Sasaki","doi":"10.1177/1758736015576009","DOIUrl":"https://doi.org/10.1177/1758736015576009","url":null,"abstract":"This study aimed to investigate the effect of attachment type on the load transmitted to implants and the residual ridge in a mandibular two-implant-supported overdenture in a model study. Ball attachments, locator attachments, and round-bar attachments were selected and examined. Static and dynamic vertical loads of 100 N were applied in the right first molar region. The load on the implants was measured by piezoelectric three-dimensional force transducers, and the load on the residual ridge beneath the denture base was measured using a tactile sheet sensor. The load on the implants with ball attachments was significantly higher than that with the other two attachments. The load on the residual ridge with round-bar attachments was significantly higher than that with the other two attachments. Our findings indicate that the three-dimensional load on implants and the residual ridge beneath the denture base is significantly associated with the type of attachment used in implant-supported overdentures. ","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"6 ","pages":"1758736015576009"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1758736015576009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33151773","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: 16

Evaluation of mechanical properties of esthetic brackets. 美学支架的力学性能评价。

Journal of dental biomechanics Pub Date : 2015-02-26 eCollection Date: 2015-01-01 DOI: 10.1177/1758736015574401

Shigeyuki Matsui, Eisaku Umezaki, Daigo Komazawa, Yuichiro Otsuka, Naoto Suda

引用次数: 20

Biomechanical aspects of segmented arch mechanics combined with power arm for controlled anterior tooth movement: A three-dimensional finite element study. 节段弓力学结合动力臂控制前牙移动的生物力学方面:三维有限元研究。

Journal of dental biomechanics Pub Date : 2015-01-08 eCollection Date: 2015-01-01 DOI: 10.1177/1758736014566337

Hiroya Ozaki, Jun-Ya Tominaga, Ryo Hamanaka, Mayumi Sumi, Pao-Chang Chiang, Motohiro Tanaka, Yoshiyuki Koga, Noriaki Yoshida

{"title":"Biomechanical aspects of segmented arch mechanics combined with power arm for controlled anterior tooth movement: A three-dimensional finite element study.","authors":"Hiroya Ozaki, Jun-Ya Tominaga, Ryo Hamanaka, Mayumi Sumi, Pao-Chang Chiang, Motohiro Tanaka, Yoshiyuki Koga, Noriaki Yoshida","doi":"10.1177/1758736014566337","DOIUrl":"https://doi.org/10.1177/1758736014566337","url":null,"abstract":"The porpose of this study was to determine the optimal length of power arms for achieving controlled anterior tooth movement in segmented arch mechanics combined with power arm. A three-dimensional finite element method was applied for the simulation of en masse anterior tooth retraction in segmented power arm mechanics. The type of tooth movement, namely, the location of center of rotation of the maxillary central incisor in association with power arm length, was calculated after the retraction force was applied. When a 0.017 × 0.022-in archwire was inserted into the 0.018-in slot bracket, bodily movement was obtained at 9.1 mm length of power arm, namely, at the level of 1.8 mm above the center of resistance. In case a 0.018 × 0.025-in full-size archwire was used, bodily movement of the tooth was produced at the power arm length of 7.0 mm, namely, at the level of 0.3 mm below the center of resistance. Segmented arch mechanics required shorter length of power arms for achieving any type of controlled anterior tooth movement as compared to sliding mechanics. Therefore, this space closing mechanics could be widely applied even for the patients whose gingivobuccal fold is shallow. The segmented arch mechanics combined with power arm could provide higher amount of moment-to-force ratio sufficient for controlled anterior tooth movement without generating friction, and vertical forces when applying retraction force parallel to the occlusal plane. It is, therefore, considered that the segmented power arm mechanics has a simple appliance design and allows more efficient and controllable tooth movement. ","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"6 ","pages":"1758736014566337"},"PeriodicalIF":0.0,"publicationDate":"2015-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1758736014566337","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32994091","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

The effect of perturbations on resistance to sliding in second-order moments comparing two different bracket types. 比较两种不同支架类型对二阶矩的扰动对滑动阻力的影响。

Journal of dental biomechanics Pub Date : 2014-11-04 eCollection Date: 2014-01-01 DOI: 10.1177/1758736014557500

Justin K Wong, Dan L Romanyk, Roger W Toogood, Giseon Heo, Jason P Carey, Paul W Major

{"title":"The effect of perturbations on resistance to sliding in second-order moments comparing two different bracket types.","authors":"Justin K Wong, Dan L Romanyk, Roger W Toogood, Giseon Heo, Jason P Carey, Paul W Major","doi":"10.1177/1758736014557500","DOIUrl":"https://doi.org/10.1177/1758736014557500","url":null,"abstract":"Orthodontic literature has shown all ligation methods to behave similarly in the clinical situation; however, the reasoning behind this still requires further investigation. A novel frictional device able to measure forces at the level of the bracket along with a custom perturbation device was used to investigate the effect of perturbations on resistance to sliding (RS) using conventional and passive ligated brackets. 150 3M Victory Series twins (0.022 slot) and 150 Damon Q brackets (0.022 slot) were tested using an 0.018 x 0.025 stainless steel wire for RS. There were 5 test groups consisting of equal numbers (n=30) representing combinations of high and low amplitude and frequency of perturbations along with a control. Second order angulation tested ranged from 0 to 6 degrees. Results for conventional brackets in the presence of perturbations at 0 degrees showed there was a statistically significant reduction (P<0.001) in RS when compared to controls. At 6 degrees, this difference (P<0.001) was seen in both high perturbation groups and one of the low perturbation groups. For passive ligated brackets, no statistically significant difference between groups was seen at 0 degrees. However, at 6 degrees high perturbation groups both resulted in statistically significant (P<0.001) reductions in RS when compared to controls. From this study it was concluded that passive ligated brackets have a lower RS when compared to conventional ligated brackets under all test conditions and angulations. Also, amplitude of perturbations has a larger role than frequency in reduction of RS values. ","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"5 ","pages":"1758736014557500"},"PeriodicalIF":0.0,"publicationDate":"2014-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/af/49/10.1177_1758736014557500.PMC4228925.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32814480","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: 6

Comparative study of mechanical properties of dental restorative materials and dental hard tissues in compressive loads. 牙体修复材料与牙体硬组织在压缩载荷下力学性能的比较研究。

Journal of dental biomechanics Pub Date : 2014-10-11 eCollection Date: 2014-01-01 DOI: 10.1177/1758736014555246

Keyoung Jin Chun, Jong Yeop Lee

{"title":"Comparative study of mechanical properties of dental restorative materials and dental hard tissues in compressive loads.","authors":"Keyoung Jin Chun, Jong Yeop Lee","doi":"10.1177/1758736014555246","DOIUrl":"https://doi.org/10.1177/1758736014555246","url":null,"abstract":"There are two objectives. One is to show the differences in the mechanical properties of various dental restorative materials compared to those of enamel and dentin. The other is to ascertain which dental restorative materials are more suitable for clinical treatments. Amalgam, dental ceramic, gold alloy, dental resin, zirconia, and titanium alloy were processed as dental restorative material specimens. The specimens (width, height, and length of 1.2, 1.2, and 3.0 mm, respectively) were compressed at a constant loading speed of 0.1 mm/min. The maximum stress (115.0 ± 40.6, 55.0 ± 24.8, 291.2 ± 45.3, 274.6 ± 52.2, 2206.0 ± 522.9, and 953.4 ± 132.1 MPa), maximum strain (7.8% ± 0.5%, 4.0% ± 0.1%, 12.7% ± 0.8%, 32.8% ± 0.5%, 63.5% ± 14.0%, and 45.3% ± 7.4%), and elastic modulus (1437.5 ± 507.2, 1548.4 ± 583.5, 2323.4 ± 322.4, 833.1 ± 92.4, 3895.2 ± 202.9, and 2222.7 ± 277.6 MPa) were evident for amalgam, dental ceramic, gold alloy, dental resin, zirconia, and titanium alloy, respectively. The reference hardness value of amalgam, dental ceramic, gold alloy, dental resin, zirconia, and titanium alloy was 90, 420, 130-135, 86.6-124.2, 1250, and 349, respectively. Since enamel grinds food, its abrasion resistance is important. Therefore, hardness value should be prioritized for enamel. Since dentin absorbs bite forces, mechanical properties should be prioritized for dentin. The results suggest that gold alloy simultaneously has a hardness value lower than enamel (74.8 ± 18.1), which is important in the wear of the opposing natural teeth, and higher maximum stress, maximum strain, and elastic modulus than dentin (193.7 ± 30.6 MPa, 11.9% ± 0.1%, 1653.7 ± 277.9 MPa, respectively), which are important considering the rigidity to absorb bite forces. ","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"5 ","pages":"1758736014555246"},"PeriodicalIF":0.0,"publicationDate":"2014-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1758736014555246","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32778847","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: 69

Biomechanics and force system of butterfly arch: A device for three-dimensional controlling of upper molars. 蝴蝶弓生物力学与力系统:一种上磨牙三维控制装置。

Journal of dental biomechanics Pub Date : 2014-09-23 eCollection Date: 2014-01-01 DOI: 10.1177/1758736014552149

Alireza Nikkerdar

引用次数: 2

Observation of changes in the metallurgical characteristics of Ni-Cr alloys using Nd:YAG laser welding. Nd:YAG激光焊接Ni-Cr合金的冶金特性变化观察。

Journal of dental biomechanics Pub Date : 2014-08-17 eCollection Date: 2014-01-01 DOI: 10.1177/1758736014547144

Mh Hong, Sm Choi

{"title":"Observation of changes in the metallurgical characteristics of Ni-Cr alloys using Nd:YAG laser welding.","authors":"Mh Hong, Sm Choi","doi":"10.1177/1758736014547144","DOIUrl":"https://doi.org/10.1177/1758736014547144","url":null,"abstract":"This study aimed to determine the effect of hardness change according to penetration depth in the laser fusing zone and observed the correlation of the microstructure as an Nd:YAG laser was irradiated to Ni-Cr alloy for dental use by setting the spot diameter size to various conditions. In all groups, the hardness depth profiles in the laser fusing zone and heat-affected zone (HAZ) had larger values than those of the base metal. In addition, the hardness values in places beyond the fusing zone and the HAZ were measured as being quantitatively lower. The observation result of the diffusion of the constituent elements and microstructure using field emission scanning electron microscopy, energy-dispersive spectroscopy, and electron probe microanalyzer showed that the fusing zone revealed a much finer dendritic form than the base metal due to the self-quenching effect after welding, while no change in constituent elements was found although some evaporation of the main elements was observed. In addition, Mo- and Si-combined intermetallic compounds were formed on the interdendritic area. Through this study, the laser fusing zone had better hardenability due to the intermetallic compound and grain refinement effect. ","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"5 ","pages":"1758736014547144"},"PeriodicalIF":0.0,"publicationDate":"2014-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/de/0e/10.1177_1758736014547144.PMC4206690.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32769353","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: 2

Effect of tapering internal coronal walls on fracture resistance of anterior teeth treated with cast post and core: In vitro study. 锥形内冠状壁对铸造桩核治疗前牙抗骨折能力的影响。

Journal of dental biomechanics Pub Date : 2014-08-12 eCollection Date: 2014-01-01 DOI: 10.1177/1758736014547550

Loubna Shamseddine, Rita Eid, Fodda Homsy, Hasan Elhusseini

{"title":"Effect of tapering internal coronal walls on fracture resistance of anterior teeth treated with cast post and core: In vitro study.","authors":"Loubna Shamseddine, Rita Eid, Fodda Homsy, Hasan Elhusseini","doi":"10.1177/1758736014547550","DOIUrl":"https://doi.org/10.1177/1758736014547550","url":null,"abstract":"When fabricating indirect post and core, internal coronal walls are tapered to remove undercuts and allow a better adaptation. To evaluate the fracture strength of anterior tooth reconstructed with post and core and crowned, with two different taper of internal coronal walls, 6° and 30° to the long axis, two groups of 30 clear plastic analogues simulating endodontically treated maxillary central incisors were prepared. The analogues crowned were subjected to a compressive load with a 1-kN cell at a crosshead speed of 0.05 mm/min at 130° to the long axis until fracture occurred. Data were analyzed by Lillifors and Mann-Whitney tests. Mean failure loads for the groups were as follows: group I 1038.69 N (standard deviation ±243.52 N) and group II 1231.86 N (standard deviation ±368.76 N). Statistical tests showed significant difference between groups (p = 0.0010 < 0.01). Increasing the taper of internal coronal walls appears to enhance the fracture resistance of anterior maxillary teeth post and core reconstructed. ","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"5 ","pages":"1758736014547550"},"PeriodicalIF":0.0,"publicationDate":"2014-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/88/05/10.1177_1758736014547550.PMC4206691.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32769354","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

Leakage evaluation of original and compatible implant-abutment connections: In vitro study using Rhodamine B. 原始和兼容种植体-基台连接的泄漏评估:罗丹明B的体外研究。

Journal of dental biomechanics Pub Date : 2014-08-11 eCollection Date: 2014-01-01 DOI: 10.1177/1758736014547143

Antoine Berberi, George Tehini, Khaldoun Rifai, Farah Bou Nasser Eddine, Bassam Badran, Haidar Akl

{"title":"Leakage evaluation of original and compatible implant-abutment connections: In vitro study using Rhodamine B.","authors":"Antoine Berberi, George Tehini, Khaldoun Rifai, Farah Bou Nasser Eddine, Bassam Badran, Haidar Akl","doi":"10.1177/1758736014547143","DOIUrl":"https://doi.org/10.1177/1758736014547143","url":null,"abstract":"Leakage has been addressed as a major contributing factor to inflammatory reactions at the implant-abutment connection, leading to problems such as oral malodor, inflammation, and marginal bone loss. The aim of this study was to investigate in vitro the leakage at implant-abutment interface of OsseoSpeed™ implants connected to original and compatible abutments. A total of 28 OsseoSpeed implants were divided into four groups (n = 7). Each group was connected to four different abutments according to manufacturers' recommendations: group A (TiDesign™); group B (Natea™); group C (Dual™); and group D (Implanet™) abutments. The inner volume of each implant-abutment combination was calculated and leakage was detected for each group with spectrophotometric analysis at 1 h (D0) and 48 h (D1) of incubation time using Rhodamine B. At 1 h, leakage volume was significantly lower in TiDesign and Dual than in Natea and Implanet (P < 0.001). At 48 h, however, leakage was significantly lower between TiDesign and all other systems (P < 0.005). Compatible abutments do not fit internal connection of OsseoSpeed implants perfectly, which increases the leakage of the final assembly. ","PeriodicalId":88916,"journal":{"name":"Journal of dental biomechanics","volume":"5 ","pages":"1758736014547143"},"PeriodicalIF":0.0,"publicationDate":"2014-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1758736014547143","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32769352","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: 21

Comparative stress analysis of delayed and immediate loading of a single implant in an edentulous maxilla model. 上颌无牙模型单种植体延迟与即刻加载的应力对比分析。

Journal of dental biomechanics Pub Date : 2014-05-14 eCollection Date: 2014-01-01 DOI: 10.1177/1758736014533982

Jie Gao, Yasuyuki Matsushita, Daisuke Esaki, Tatsuya Matsuzaki, Kiyoshi Koyano

引用次数: 9