Prosthodontic Research & Practice最新文献_第5页

Load on Abutment Teeth and Displacement of Denture Base in Unilateral Distal-Extension Removable Dentures 单侧远伸可摘义齿基牙负荷与基托位移

Prosthodontic Research & Practice Pub Date : 2008-07-01 DOI: 10.2186/PRP.7.162

Koichi Aoda, I. Shimamura, K. Sakurai, Y. Tahara, N. Kanayama

{"title":"Load on Abutment Teeth and Displacement of Denture Base in Unilateral Distal-Extension Removable Dentures","authors":"Koichi Aoda, I. Shimamura, K. Sakurai, Y. Tahara, N. Kanayama","doi":"10.2186/PRP.7.162","DOIUrl":"https://doi.org/10.2186/PRP.7.162","url":null,"abstract":"Objectives: The purpose of this study was to determine the mechanically appropriate retainer design for unilateral distal-extension removable dentures.Methods: Two models were constructed, each with a different design of retainer placed on the first and second mandibular premolars. Each model was composed of bone, denture underlying mucosa, retainer and denture base. In design A, Akers clasps were set on the first and second premolars, and in design B, an occlusal rest and back-action clasp with mesial rest were set on the first and second premolars, respectively. Loading on the occlusal surface of the denture was performed in the vertical and oblique directions. Load on the abutment tooth and displacement of the denture base were determined by 3-dimensional finite element analysis.Results: Load on the abutment tooth in the vertical direction caused by vertical loading on the denture was lower in design B than in design A. No large difference in displacement of the denture base was observed between design A and B. Load on the abutment tooth both in the vertical and buccolingual direction induced by loading on the denture in the lingual and buccal directions was lower in design B than in design A. However, displacement of the denture base in the vertical and buccolingual directions induced by loading on the denture in the lingual direction was higher in design B than in design A.Conclusion: In this study, displacement of the denture base was smaller in design A than in design B, so design A would be more useful clinically than design B, but the abutment tooth would require greater support.","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128604917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Study on the Measurement Condition of Oral Moisture Checking Device (Mucus 口腔水分检测装置(黏液)测量条件的研究

Prosthodontic Research & Practice Pub Date : 2008-07-01 DOI: 10.2186/PRP.7.168

Fumi Takahashi, Mutsumi Takahashi, O. Morita

{"title":"Study on the Measurement Condition of Oral Moisture Checking Device (Mucus","authors":"Fumi Takahashi, Mutsumi Takahashi, O. Morita","doi":"10.2186/PRP.7.168","DOIUrl":"https://doi.org/10.2186/PRP.7.168","url":null,"abstract":"The aim of this study was to investigate the influence of the measurement condition on the measurement value of an oral moisture checking device. Healthy adults were enrolled to investigate the influence of repeating measurement, rinsing, and measurement time. Oral moisture was measured at the lingual (LM) and buccal mucosa (BM) using the oral moisture checking device. The statistical analysis (Friedman test) was performed to compare the moisture of 3 times' repeating measurement, and the moisture just after rinsing, 3, and 5 minutes after rinsing, and the moisture according to measurement time (at 9:00, and 11:00 a.m., and at 1:00, 3:00, and 5:00 p.m.). As the results of the repeating measurement, there were significant difference between the measurement value at LM of the first time and third time measurement, second time and third time measurement (p<0.01), and the first time and second time measurement (p<0.05). As the results of rinsing, statistically significant difference was found between the measurement value at LM just after rinsing and 5 minutes after rinsing, and 3 minutes after rinsing and 5 minutes after rinsing (p<0.01). There was not significant difference among the measurement time. The results of this study demonstrated that the measurement value increased at LM by repeating measurement and increased at 5 minutes after rinsing, and wasn't influenced by measurement time. It was suggested that practicing the measurement using an oral moisture checking device was necessary, and the measurement could be performed at any time.","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126015412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

The Usability of 3D Model by Plaster for Dental CT : Accuracy Measurement of Hexahedron Model 牙科CT石膏三维模型的可用性:六面体模型的精度测量

Prosthodontic Research & Practice Pub Date : 2008-07-01 DOI: 10.2186/PRP.7.198

Yukumi Nagata, Keitarou Okashita, Mitsuo Iwata, M. Inoue, T. Etoh

引用次数: 0

Effects of Experimental Palatal Appliances on Oral Senses 实验性腭部矫治器对口腔感觉的影响

Prosthodontic Research & Practice Pub Date : 2008-07-01 DOI: 10.2186/PRP.7.186

N. Kodama, G. Nishigawa, Y. Maruo, S. Minagi, R. Matsuo

引用次数: 0

Reliability of Occlusal Contacts as Methods for Occlusal Analysis 咬合接触作为咬合分析方法的可靠性

Prosthodontic Research & Practice Pub Date : 2008-07-01 DOI: 10.2186/PRP.7.249

Keitarou Okashita, Eikichi Matsumoto, Mitsuo Iwata, Korenori Arai, T. Kawazoe

引用次数: 3

Decision Making in Conventional Fixed Prosthodontics 传统固定修复的决策

Prosthodontic Research & Practice Pub Date : 2008-07-01 DOI: 10.2186/PRP.7.107

J. Greenberg

引用次数: 0

Stress Analysis of All-on-4 System Using a 3-Dimensional Finite Element Method 基于三维有限元法的全on-4系统应力分析

Prosthodontic Research & Practice Pub Date : 2008-07-01 DOI: 10.2186/PRP.7.147

K. Sasaki, Y. Matsushita, Y. Tsukiyama, D. Esaki, K. Koyano

{"title":"Stress Analysis of All-on-4 System Using a 3-Dimensional Finite Element Method","authors":"K. Sasaki, Y. Matsushita, Y. Tsukiyama, D. Esaki, K. Koyano","doi":"10.2186/PRP.7.147","DOIUrl":"https://doi.org/10.2186/PRP.7.147","url":null,"abstract":"The purpose of this study was to investigate the mechanical risk factors of All-on-4 system by analyzing the stress distribution induced on implants and surrounding bone tissue using a 3-dimensional finite element method (3D-FEM). The effects of bone quality and superstructure material property were also investigated.A 3D-FEM model of an edentulous mandible was constructed from computerized tomographic images. The two anterior-most implants were placed in the right and left lateral incisor areas. Two additional implants were placed anterior to the mental foramen with a distal inclination of 40 degrees to the occlusal plane. The 3D-FEM All-on-4 model included a fixed mandibular complete-arch superstructure supported by four implants. Four types of bone (1 to 4) were simulated by varying the Young's modulus for cancellous bone. In addition, three superstructure materials were prepared: acrylic resin, gold alloy, and Co-Cr alloy. A 100 N load was applied on the left first molar region. Stress concentration was observed around the left posterior inclined implants, especially on the distal side. When the cancellous bone is low elastic, greater stress concentration was observed. Of the three materials, the acrylic resin superstructure showed the greatest stress concentration around the inclined implant.The present study indicated that the use of the superstructure with higher elastic material is useful for reducing the mechanical risk of All-on-4 system.","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121669687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Clinical Evaluation of Tooth Reduction Using Piezotome 压电刀对牙齿复位的临床评价

Prosthodontic Research & Practice Pub Date : 2008-07-01 DOI: 10.2186/PRP.7.219

Y. Tawada, K. Ueda, I. Takase, F. Watanabe

{"title":"Clinical Evaluation of Tooth Reduction Using Piezotome","authors":"Y. Tawada, K. Ueda, I. Takase, F. Watanabe","doi":"10.2186/PRP.7.219","DOIUrl":"https://doi.org/10.2186/PRP.7.219","url":null,"abstract":"The purpose of this study was to compare and assess ultrasonic tooth preparation using an air-turbine and micro-motor. Twelve human extracted molars were used in this study. Each crown of the molar was roughly prepared from complete veneer crown and the cervical margin was divided equally into three-120° angles along the line of cement-enamel junction (CEJ). Three devices: Piezotome (SATELEC ACTEON, France), an air-turbine and a 1:5 speed friction grip (FG) micro-motor were used to finish the chamfer margin of each crown. After preparation, the margin continuity, sharpness and roughness, unevenness of prepared surface, were observed by a microscope with 8x magnification. Evaluation was made by 3 independent doctors evaluating the results using 3 levels and compared by the Kruskal-Wallis test. Piezotome showed excellent evenness and the evaluation results were highly significant compared with the micro-motor and significant compared with the air-turbine. Preparation time was analyzed by one way ANOVA and post hoc multiple comparison. The total preparation time of Piezotome was significant longer than the other two. Regarding the results of the simulated preparation test of the subgingival margin for complete veneer crowns using extracted human molars, completion of the cervical margin by Piezotome took more longer, but it could obtain a better cervical margin and this method has sufficient clinical value.","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126578715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Introduction of Parallel Measurement and Supplementary Apparatus Newly Developed 新研制的平行测量及辅助装置介绍

Prosthodontic Research & Practice Pub Date : 2008-07-01 DOI: 10.2186/PRP.7.243

Masatsugu Okada, H. Inoue

引用次数: 2

Hippocampal Glutamate Release on Learning and Memory in Teeth-loss Rats 失牙大鼠海马谷氨酸释放对学习记忆的影响

Prosthodontic Research & Practice Pub Date : 2008-07-01 DOI: 10.2186/PRP.7.71

Akihito Matsuno, Hiroshi Inoue

{"title":"Hippocampal Glutamate Release on Learning and Memory in Teeth-loss Rats","authors":"Akihito Matsuno, Hiroshi Inoue","doi":"10.2186/PRP.7.71","DOIUrl":"https://doi.org/10.2186/PRP.7.71","url":null,"abstract":"Purpose: To clarify the effects of molar tooth loss on learning and memory, hippocampal glutamate release during a passive-avoidance task was measured with a telemetric glutamate biosensor.Methods: Male Sprague-Dawley rats were used. Under general anesthesia, all the maxillary molars were extracted from the EXT group rats (n = 8); those in the CON group (control, n = 8) were anesthetized without tooth extraction. At age 7 weeks, the rats were subjected to a passive-avoidance task consisting of acquisition and retention trials. Simultaneously, hippocampal glutamate release was measured. First, during the acquisition trial, the rats were placed in a light compartment, and the duration before they entered a dark compartment was measured (reaction latency). Immediately after the rat entered the dark compartment, an electric shock was applied through a grid floor. After 24 h, the retention trial was performed, and the reaction latency was measured in the same manner. Further, a biosensor was used to measure the release of hippocampal glutamate before and after the start of each trial.Results: Regarding the reaction latency during the passive-avoidance task, no significant differences were seen between the groups in the acquisition trial. Reaction latency increased in both groups in the retention trial, but was significantly shorter in the EXT group. Furthermore, hippocampal glutamate release in the acquisition trial was significantly shorter in the EXT group, but in the retention trial, no significant difference in glutamate release was seen between the groups.Conclusion: Molar tooth loss may impede learning and memory.","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"186 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115642734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1