Pub Date : 2012-03-01DOI: 10.5395/RDE.2012.37.1.54
Ho-Jin Moon
This study aims to introduce the method that can relieve vibrating forces to oral environment by making an embouchure aid. Thin plastic crown forms were fabricated to prevent tooth abrasion and irritation to lip mucosa for the saxophone player. After application to the player, the most comfort form was chosen and delivered to 3 professional saxophone players. After 5 mon, the players responded to the survey. This embouchure aid did not disturb playing and gave comfort to lower lip. In general, the players preferred thin soft type and thought it caused little effect on sound. Far too little attention has been paid to the problems encountered by single-reed wind instrumentalist who suffer from tooth abrasion and irritation to lip mucosa. The embouchure aid not only prevent tooth damage but also diminish the discomfort of tight embouchure.
{"title":"An embouchure aid for saxophone player","authors":"Ho-Jin Moon","doi":"10.5395/RDE.2012.37.1.54","DOIUrl":"https://doi.org/10.5395/RDE.2012.37.1.54","url":null,"abstract":"This study aims to introduce the method that can relieve vibrating forces to oral environment by making an embouchure aid. Thin plastic crown forms were fabricated to prevent tooth abrasion and irritation to lip mucosa for the saxophone player. After application to the player, the most comfort form was chosen and delivered to 3 professional saxophone players. After 5 mon, the players responded to the survey. This embouchure aid did not disturb playing and gave comfort to lower lip. In general, the players preferred thin soft type and thought it caused little effect on sound. Far too little attention has been paid to the problems encountered by single-reed wind instrumentalist who suffer from tooth abrasion and irritation to lip mucosa. The embouchure aid not only prevent tooth damage but also diminish the discomfort of tight embouchure.","PeriodicalId":21126,"journal":{"name":"Restorative Dentistry and Endodontics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73726161","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}
Pub Date : 2012-03-01DOI: 10.5395/RDE.2012.37.1.34
C. Chung, Hana Kim, Y. Park, Min Jeong Kim, Young Oh, S. Shin, Y. Choi, Kyung-Ho Kim
Objectives: The aim was to confirm the stem cell-like properties of the dental pulp stromal cells and to evaluate the morphologic changes during in vitro chondrogenesis. Materials and Methods: Stromal cells were outgrown from the dental pulp tissue of the premolars. Surface markers were investigated and cell proliferation rate was compared to other mesenchymal stem cells. Multipotency of the pulp cells was confirmed by inducing osteogenesis, adipogenesis and chondrogenesis. The morphologic changes in the chondrogenic pellet during the 21 day of induction were evaluated under light microscope and transmission electron microscope. TUNEL assay was used to evaluate apoptosis within the chondrogenic pellets. Results: Pulp cells were CD90, 105 positive and CD31, 34 negative. They showed similar proliferation rate to other stem cells. Pulp cells differentiated to osteogenic, adipogenic and chondrogenic tissues. During chondrogenesis, 3-dimensional pellet was created with multi-layers, hypertrophic chondrocyte-like cells and cartilage-like extracellular matrix. However, cell morphology became irregular and apoptotic cells were increased after 7 day of chondrogenic induction. Conclusions: Pulp cells indicated mesenchymal stem cell-like characteristics. During the in vitro chondrogenesis, cellular activity was superior during the earlier phase (within 7 day) of differentiation.
{"title":"Morphological evaluation during in vitro chondrogenesis of dental pulp stromal cells","authors":"C. Chung, Hana Kim, Y. Park, Min Jeong Kim, Young Oh, S. Shin, Y. Choi, Kyung-Ho Kim","doi":"10.5395/RDE.2012.37.1.34","DOIUrl":"https://doi.org/10.5395/RDE.2012.37.1.34","url":null,"abstract":"Objectives: The aim was to confirm the stem cell-like properties of the dental pulp stromal cells and to evaluate the morphologic changes during in vitro chondrogenesis. Materials and Methods: Stromal cells were outgrown from the dental pulp tissue of the premolars. Surface markers were investigated and cell proliferation rate was compared to other mesenchymal stem cells. Multipotency of the pulp cells was confirmed by inducing osteogenesis, adipogenesis and chondrogenesis. The morphologic changes in the chondrogenic pellet during the 21 day of induction were evaluated under light microscope and transmission electron microscope. TUNEL assay was used to evaluate apoptosis within the chondrogenic pellets. Results: Pulp cells were CD90, 105 positive and CD31, 34 negative. They showed similar proliferation rate to other stem cells. Pulp cells differentiated to osteogenic, adipogenic and chondrogenic tissues. During chondrogenesis, 3-dimensional pellet was created with multi-layers, hypertrophic chondrocyte-like cells and cartilage-like extracellular matrix. However, cell morphology became irregular and apoptotic cells were increased after 7 day of chondrogenic induction. Conclusions: Pulp cells indicated mesenchymal stem cell-like characteristics. During the in vitro chondrogenesis, cellular activity was superior during the earlier phase (within 7 day) of differentiation.","PeriodicalId":21126,"journal":{"name":"Restorative Dentistry and Endodontics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84557548","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}
{"title":"A step towards international society","authors":"B. Cho","doi":"10.5395/rde.2012.37.1.1","DOIUrl":"https://doi.org/10.5395/rde.2012.37.1.1","url":null,"abstract":"","PeriodicalId":21126,"journal":{"name":"Restorative Dentistry and Endodontics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82738305","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}
Pub Date : 2011-03-01DOI: 10.5395/JKACD.2011.36.2.114
Euiseong Kim, Seung‐Jong Lee, Jeong-Won Park, S. Shin
Objectives: This study was aimed to examine the patients’perception and satisfaction with the results of endodontic microsurgery which was apicoectomy with retrofilling. Materials and Methods: A questionnaire was given to 109 patients, who were recalled after a minimum of 3 months upon endodontic microsurgery in the Department of Conservative Dentistry, Yonsei University. A contingency table and correlation analysis were used to determine if there were any correlations between age/gender and the patients’responses ( p = 0.05). Results: Approximately 60% of respondents answered they had never heard of surgical endodontic procedures. 63.3% of respondents chose the surgical option because they wanted to keep their natural teeth. If the patient required the same procedure on another tooth later, 100 out of 109 respondents answered they would choose microsurgery instead of extraction. Most patients (82.57%) appeared to be satisfied with the surgical procedure. Conclusions: Endodontic microsurgery consisting of apicoectomy and retrofilling seems to appeal to majority of patients as a satisfactory and valuable treatment choice. [J Kor Acad Cons Dent 2011;36(2):114-118.]
{"title":"Patients' perception and satisfaction with apicoectomy","authors":"Euiseong Kim, Seung‐Jong Lee, Jeong-Won Park, S. Shin","doi":"10.5395/JKACD.2011.36.2.114","DOIUrl":"https://doi.org/10.5395/JKACD.2011.36.2.114","url":null,"abstract":"Objectives: This study was aimed to examine the patients’perception and satisfaction with the results of endodontic microsurgery which was apicoectomy with retrofilling. Materials and Methods: A questionnaire was given to 109 patients, who were recalled after a minimum of 3 months upon endodontic microsurgery in the Department of Conservative Dentistry, Yonsei University. A contingency table and correlation analysis were used to determine if there were any correlations between age/gender and the patients’responses ( p = 0.05). Results: Approximately 60% of respondents answered they had never heard of surgical endodontic procedures. 63.3% of respondents chose the surgical option because they wanted to keep their natural teeth. If the patient required the same procedure on another tooth later, 100 out of 109 respondents answered they would choose microsurgery instead of extraction. Most patients (82.57%) appeared to be satisfied with the surgical procedure. Conclusions: Endodontic microsurgery consisting of apicoectomy and retrofilling seems to appeal to majority of patients as a satisfactory and valuable treatment choice. [J Kor Acad Cons Dent 2011;36(2):114-118.]","PeriodicalId":21126,"journal":{"name":"Restorative Dentistry and Endodontics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73054348","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}
Pub Date : 2009-07-01DOI: 10.5395/JKACD.2009.34.4.364
J. Yom, In-bog Lee
The aim of this study was to evaluate the effect of fiber direc tion on the polymerization shrinkage of fiber-reinforced composite. The disc-shaped flowable composite specimens (d = 10 mm, h = 2 mm, Aeliteflo A2,Bisco, Inc., IL, USA) with or without glass fiber bundle (X-80821P Glass Fiber, Bisco, Inc., IL, USA)inside were prepared, and the longitudinal and transversal polymerization shrinkage of the specimens onradial plane were measured with strain gages (Linear S-series 350Ω, CAS, Seoul, Korea). In order to mea-sure the free polymerization shrinkage of the flowable composite itself, the disc-shaped specimens (d = 7mm, h = 1 mm) without fiber were prepared, and the axial shrink age was measured with an LVDT (linearvariable differential transformer) displacement sensor. The cross-section of the polymerized specimens wasobserved with a scanning electron microscope to examine the arrangement of the fiber bundle in composite.The mean polymerization shrinkage value of each specimen group was analyzed with ANOVA and Scheffepost-hoc test (α=0.05).The radial polymerization shrinkage of fiber-reinforced composite was decreased in the longitudinal direc-tion of fiber, but increased in the transversal direction of fiber (p<0.05). We can conclude that the polymer-ization shrinkage of fiber-reinforced composite splint or restoratives is dependent on the direction of fiber.[J Kor Acad Cons Dent 34(4):364-370, 2009]Key words:fiber-reinforced composite, longitudinal direction, transversal direction, polymerization shrinkage, strain gage, linear variable differential transformer-Received 2009.5.11., revised 2009.5.31., accepted 2009.6.25.-
研究纤维方向对纤维增强复合材料聚合收缩性能的影响。制备内部有或没有玻璃纤维束(X-80821P glass fiber,Bisco, Inc.， IL, USA)的圆盘状可流动复合材料试样(d = 10 mm, h = 2 mm, Aeliteflo A2,Bisco, Inc.， IL, USA)，用应变片(Linear s系列350Ω， CAS, Seoul, Korea)测量试样在径向平面上的纵向和横向聚合收缩率。为了测定可流动复合材料本身的自由聚合收缩，制备了无纤维的圆盘状试样(d = 7mm, h = 1mm)，用线性可变差动变压器(LVDT)位移传感器测量轴向收缩年龄。用扫描电子显微镜观察聚合样品的横截面，以检查纤维束在复合材料中的排列。各组试样的平均聚合收缩值采用方差分析和Scheffepost-hoc检验(α=0.05)进行分析。纤维增强复合材料的径向聚合收缩率在纤维纵向上减小，在纤维横向上增大(p<0.05)。我们可以得出结论，纤维增强复合材料夹板或修复体的聚合收缩与纤维的方向有关。关键词:纤维增强复合材料，纵向，横向，聚合收缩，应变计，线性可变差动变压器[J] .材料工程学报，2009(4):364- 3370。，修订2009.5.31。，接受2009.6.25.-
{"title":"EFFECT OF FIBER DIRECTION ON THE POLYMERIZATION SHRINKAGE OF FIBER-REINFORCED COMPOSITES","authors":"J. Yom, In-bog Lee","doi":"10.5395/JKACD.2009.34.4.364","DOIUrl":"https://doi.org/10.5395/JKACD.2009.34.4.364","url":null,"abstract":"The aim of this study was to evaluate the effect of fiber direc tion on the polymerization shrinkage of fiber-reinforced composite. The disc-shaped flowable composite specimens (d = 10 mm, h = 2 mm, Aeliteflo A2,Bisco, Inc., IL, USA) with or without glass fiber bundle (X-80821P Glass Fiber, Bisco, Inc., IL, USA)inside were prepared, and the longitudinal and transversal polymerization shrinkage of the specimens onradial plane were measured with strain gages (Linear S-series 350Ω, CAS, Seoul, Korea). In order to mea-sure the free polymerization shrinkage of the flowable composite itself, the disc-shaped specimens (d = 7mm, h = 1 mm) without fiber were prepared, and the axial shrink age was measured with an LVDT (linearvariable differential transformer) displacement sensor. The cross-section of the polymerized specimens wasobserved with a scanning electron microscope to examine the arrangement of the fiber bundle in composite.The mean polymerization shrinkage value of each specimen group was analyzed with ANOVA and Scheffepost-hoc test (α=0.05).The radial polymerization shrinkage of fiber-reinforced composite was decreased in the longitudinal direc-tion of fiber, but increased in the transversal direction of fiber (p<0.05). We can conclude that the polymer-ization shrinkage of fiber-reinforced composite splint or restoratives is dependent on the direction of fiber.[J Kor Acad Cons Dent 34(4):364-370, 2009]Key words:fiber-reinforced composite, longitudinal direction, transversal direction, polymerization shrinkage, strain gage, linear variable differential transformer-Received 2009.5.11., revised 2009.5.31., accepted 2009.6.25.-","PeriodicalId":21126,"journal":{"name":"Restorative Dentistry and Endodontics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76757934","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}
Pub Date : 2009-01-01DOI: 10.5395/JKACD.2009.34.1.061
Tae-Min Kim, Seo-Kyoung Kim, In-Nam Hwang, Y. Hwang, B. Kang, Suk-Ja Yoon, Jae-Seo Lee, W. Oh
This study was performed to assess the radiopacity of a variety of root canal sealers according to the specification concerning root canal sealers. Ten materials including Tubli-. Kerr Pulp Canal , AH , AH , AH plus , Ad sea . , , ZOB , and dentin were evaluated in this study. In the first part, densitometric reading of an each step of aluminum step wedge on occlusal film was performed at different voltage and exposure time. In the second part, ten specimens were radiographed simultaneously with an aluminum step wedges on the occlusal films under decided condition. The mean radiographic density values of the materials were transformed into radiopacity expressed equivalent thickness of aluminum (mm Al). The following results were obtained. 1. Among the various conditions, the appropriate voltage and exposure time that meet the requirement density was 60 kVp at 0.2 s 2. All of the materials had greater radiopacity than 3 mm Al requirement of ANSI/ADA specification No. 57 (2000) and ISO No. 6876 (2001) standards. 3. The radiopacity of materials increased as thickness of materials increased. 4. The mm Al value of each specimen at 1mm in thickness has a significant difference in the statistics. It suggests that root canal sealers have a sufficient radiopacity that meet the requirement.
本研究是根据有关根管密封器的规范来评估各种根管密封器的不透光性。包括Tubli在内的十种材料。Kerr Pulp Canal, AH, AH +， Ad sea。在本研究中评估了ZOB和牙本质。第一部分，在不同的电压和曝光时间下，对各台阶的铝台阶楔在咬合膜上进行密度测量。第二部分，在确定的条件下，用铝台阶楔在咬合膜上同时对10个标本进行x线摄影。将材料的平均射线照相密度值转换为表示等效铝厚度(mm Al)的射线不透明度。得到了以下结果:1. 在各种条件中，满足密度要求的合适电压和曝光时间为60 kVp, 0.2 s 2。所有材料的辐射不透明度均高于ANSI/ADA规范57(2000)和ISO 6876(2001)标准的3毫米铝要求。3.材料的对射线不透明度随材料厚度的增加而增加。4. 各试样在厚度为1mm时的mm Al值在统计上有显著差异。提示根管封闭器具有足够的放射不透性，满足要求。
{"title":"A COMPARATIVE STUDY ON RADIOPACITY OF ROOT CANAL SEALERS","authors":"Tae-Min Kim, Seo-Kyoung Kim, In-Nam Hwang, Y. Hwang, B. Kang, Suk-Ja Yoon, Jae-Seo Lee, W. Oh","doi":"10.5395/JKACD.2009.34.1.061","DOIUrl":"https://doi.org/10.5395/JKACD.2009.34.1.061","url":null,"abstract":"This study was performed to assess the radiopacity of a variety of root canal sealers according to the specification concerning root canal sealers. Ten materials including Tubli-. Kerr Pulp Canal , AH , AH , AH plus , Ad sea . , , ZOB , and dentin were evaluated in this study. In the first part, densitometric reading of an each step of aluminum step wedge on occlusal film was performed at different voltage and exposure time. In the second part, ten specimens were radiographed simultaneously with an aluminum step wedges on the occlusal films under decided condition. The mean radiographic density values of the materials were transformed into radiopacity expressed equivalent thickness of aluminum (mm Al). The following results were obtained. 1. Among the various conditions, the appropriate voltage and exposure time that meet the requirement density was 60 kVp at 0.2 s 2. All of the materials had greater radiopacity than 3 mm Al requirement of ANSI/ADA specification No. 57 (2000) and ISO No. 6876 (2001) standards. 3. The radiopacity of materials increased as thickness of materials increased. 4. The mm Al value of each specimen at 1mm in thickness has a significant difference in the statistics. It suggests that root canal sealers have a sufficient radiopacity that meet the requirement.","PeriodicalId":21126,"journal":{"name":"Restorative Dentistry and Endodontics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90925130","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}
Pub Date : 2008-01-01DOI: 10.5395/JKACD.2008.33.1.054
H. Cho, I. Jung, Chan-Young Lee, Euiseong Kim
The purpose of this study was to determine the effect of sodium hypochlorite and steam autoclaving on the cyclic fatigue of nickel-titanium endodontic files. Two types of files with a .06 taper and #30 were used, (SybronEndo, Glendora, California, USA) and Hero (Micro-Mega, BesanCon, France). The files were divided into 6 experimental groups containing 10 files each group depending the soaking time in 6% sodium hypochlorite solution and number of cycles of steam autoclave. After sterilization, a cyclic fatigue test was performed on each file, and the fracture time was recorded in seconds. The control group underwent the cyclic fatigue test only. After the test, the surface characteristics of the files were observed using scanning electron microscopy (SEM). All groups containing the Hero 64~ files showed a similar cyclic fatigue fracture time. However, the cyclic fatigue fracture time with the files was significantly shorter in groups which were treated with sodium hypochlorite than in the control group (P and files to have significant corrosion on the file surface in groups treated with sodium hypochlorite, compared with the sharp and regular blades of the control group. files showed more corrosion than the Hero files. Bluntness of the blades of the file was observed in groups treated with steam autoclave. Although there was no obvious destruction on the surface of steam autoclaved Hero files, slight bluntness was observed. Sterilizing with a steam autoclave is much less destructive to files than sodium hypochlorite. The longer time exposed to sodium hypochlorite, the more destructive pattern was shown on the blades of the files. Therefore, when using sodium hypochlorite solution, the exposure time should be as short as possible in order to prevent corrosion and increase the cyclic fatigue fracture time.
{"title":"CYCLIC FATIGUE OF THE SODIUM HYPOCHLORITE TREATED AND /OR STEAM AUTOCLAVED NICKEL-TITANIUM ENDODONTIC FILES","authors":"H. Cho, I. Jung, Chan-Young Lee, Euiseong Kim","doi":"10.5395/JKACD.2008.33.1.054","DOIUrl":"https://doi.org/10.5395/JKACD.2008.33.1.054","url":null,"abstract":"The purpose of this study was to determine the effect of sodium hypochlorite and steam autoclaving on the cyclic fatigue of nickel-titanium endodontic files. Two types of files with a .06 taper and #30 were used, (SybronEndo, Glendora, California, USA) and Hero (Micro-Mega, BesanCon, France). The files were divided into 6 experimental groups containing 10 files each group depending the soaking time in 6% sodium hypochlorite solution and number of cycles of steam autoclave. After sterilization, a cyclic fatigue test was performed on each file, and the fracture time was recorded in seconds. The control group underwent the cyclic fatigue test only. After the test, the surface characteristics of the files were observed using scanning electron microscopy (SEM). All groups containing the Hero 64~ files showed a similar cyclic fatigue fracture time. However, the cyclic fatigue fracture time with the files was significantly shorter in groups which were treated with sodium hypochlorite than in the control group (P and files to have significant corrosion on the file surface in groups treated with sodium hypochlorite, compared with the sharp and regular blades of the control group. files showed more corrosion than the Hero files. Bluntness of the blades of the file was observed in groups treated with steam autoclave. Although there was no obvious destruction on the surface of steam autoclaved Hero files, slight bluntness was observed. Sterilizing with a steam autoclave is much less destructive to files than sodium hypochlorite. The longer time exposed to sodium hypochlorite, the more destructive pattern was shown on the blades of the files. Therefore, when using sodium hypochlorite solution, the exposure time should be as short as possible in order to prevent corrosion and increase the cyclic fatigue fracture time.","PeriodicalId":21126,"journal":{"name":"Restorative Dentistry and Endodontics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82791624","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}
Pub Date : 2006-09-01DOI: 10.5395/JKACD.2006.31.5.359
Sang-Je Jeon, Jeong-Kil Park, Hyeon-Cheol Kim, Sung-Gwan Woo, Kwang-Hoon Kim, K. Son, B. Hur
The objective of this study was to investigate the effect of excessive occlusal loading on stress distribution on four type of cervical lesion, using a three dimensional finite element analysis (3D FEA). The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. Four different lesion configurations representative of the various types observed clinically for teeth were studied. A static point load of 500N was applied to the buccal and lingual cusp (Load A and B). The principal stresses in lesion apex, and vertical sectioned margin of cervical wall were analyzed. The results were as follows 1. The patterns of stress distribution were similar but the magnitude was different in four types of lesion 2. The peak stress was observed at mesial corner and also stresses concentrated at lesion apex. 3. The compressive stress under load A and the tensile stress under load B were dominant stress. 4. Under the load, lesion can be increased and harmful to tooth structure unless restored. [J Kor Acad Cons Dent 31 (5) :359-370, 2006]
{"title":"Effects of occlusal load on the stress distribution of four cavity configurations of noncarious cervical lesions: a three-dimensional finite element analysis study","authors":"Sang-Je Jeon, Jeong-Kil Park, Hyeon-Cheol Kim, Sung-Gwan Woo, Kwang-Hoon Kim, K. Son, B. Hur","doi":"10.5395/JKACD.2006.31.5.359","DOIUrl":"https://doi.org/10.5395/JKACD.2006.31.5.359","url":null,"abstract":"The objective of this study was to investigate the effect of excessive occlusal loading on stress distribution on four type of cervical lesion, using a three dimensional finite element analysis (3D FEA). The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. Four different lesion configurations representative of the various types observed clinically for teeth were studied. A static point load of 500N was applied to the buccal and lingual cusp (Load A and B). The principal stresses in lesion apex, and vertical sectioned margin of cervical wall were analyzed. The results were as follows 1. The patterns of stress distribution were similar but the magnitude was different in four types of lesion 2. The peak stress was observed at mesial corner and also stresses concentrated at lesion apex. 3. The compressive stress under load A and the tensile stress under load B were dominant stress. 4. Under the load, lesion can be increased and harmful to tooth structure unless restored. [J Kor Acad Cons Dent 31 (5) :359-370, 2006]","PeriodicalId":21126,"journal":{"name":"Restorative Dentistry and Endodontics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85225763","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}
Pub Date : 2002-03-01DOI: 10.5395/JKACD.2002.27.2.207
Denny Y. Fang, W. Lee, C. Lai
The goal of endodontic treatment is to eliminate or to lower the bacterial concentration gradient from the root canal and to prevent reinfection. In addition to cleaning and shaping procedure, root canal filling material may play a critical role in destroying bacteria which remained in the root canal system. Killing bacteria by root canal filling procedure is either done by the hermetic obturating seal or by the direct bactericidal properties of the obturating materials. Several endodontic sealers have been found to possess antibacterial properties depending on their chemical components, such as calcium hydroxide, eugenol, and fluoride. Different types of sealers have been introduced in the market and several studies have been done to evaluate antimicrobial effect of those sealers. However, data were limited Antimicrobial activity of eight root canal sealers before and after setting
{"title":"Antimicrobial activity of eight root canal sealers before and after setting","authors":"Denny Y. Fang, W. Lee, C. Lai","doi":"10.5395/JKACD.2002.27.2.207","DOIUrl":"https://doi.org/10.5395/JKACD.2002.27.2.207","url":null,"abstract":"The goal of endodontic treatment is to eliminate or to lower the bacterial concentration gradient from the root canal and to prevent reinfection. In addition to cleaning and shaping procedure, root canal filling material may play a critical role in destroying bacteria which remained in the root canal system. Killing bacteria by root canal filling procedure is either done by the hermetic obturating seal or by the direct bactericidal properties of the obturating materials. Several endodontic sealers have been found to possess antibacterial properties depending on their chemical components, such as calcium hydroxide, eugenol, and fluoride. Different types of sealers have been introduced in the market and several studies have been done to evaluate antimicrobial effect of those sealers. However, data were limited Antimicrobial activity of eight root canal sealers before and after setting","PeriodicalId":21126,"journal":{"name":"Restorative Dentistry and Endodontics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86671730","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}
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