Purpose: The aim of this study is to evaluate the effect of changes in margin design on the stress distribution on the restoration in zirconia-based full-crown restorations using 3D finite element analysis. Material and Methods: To be used in the design of full-crown restorations, tooth number 16 was prepared in chamfer step type on a maxillary tooth-jaw model (AG-3: Tipodont, frasaco, Germany). The prepared tooth was scanned using a desktop scanner, and a 3D finite element analysis model was obtained. Zirconia frameworks are divided into 3 groups according to margin design: uniform thickness hood type (Model A), ¾ partial crown form (Model B), and lingual banded (Model C). The crown form was completed by using felspathic porcelain as the superstructure material. In order to examine the stress distributions of the margin design on the restoration, the maximum principal stress (MPa) values under 600 N vertical load were investigated. Result: The maximum stress on the zirconia framework was observed in Model A (82.90 MPa), and the maximum stress on the tooth was observed in Model B (49.34 MPa). The maximum stress on the feldspathic porcelain has the highest value in Model A (21,860 MPa). The minimum stress on the tooth occurred in Model B and is 13.33 MPa. In the zirconia framework, the lowest stress is 11.54 MPa in Model B. Conclusions: Within the results of the study, it is clear that the framework design affects the force generated on the restoration and transmitted to the tooth. The results of the study will benefit dentists in determining the infrastructure design in zirconia-based restorations. Lingual band designs have been found successful.
{"title":"The effect of margin design on stress distribution in zirconia-based full crown restorations: A 3D finite element analysis","authors":"Neslihan Güntekin, R. Mohammadi, A. Tunçdemir","doi":"10.5577/intdentres.439","DOIUrl":"https://doi.org/10.5577/intdentres.439","url":null,"abstract":"Purpose: The aim of this study is to evaluate the effect of changes in margin design on the stress distribution on the restoration in zirconia-based full-crown restorations using 3D finite element analysis.\u0000Material and Methods: To be used in the design of full-crown restorations, tooth number 16 was prepared in chamfer step type on a maxillary tooth-jaw model (AG-3: Tipodont, frasaco, Germany). The prepared tooth was scanned using a desktop scanner, and a 3D finite element analysis model was obtained. Zirconia frameworks are divided into 3 groups according to margin design: uniform thickness hood type (Model A), ¾ partial crown form (Model B), and lingual banded (Model C). The crown form was completed by using felspathic porcelain as the superstructure material. In order to examine the stress distributions of the margin design on the restoration, the maximum principal stress (MPa) values under 600 N vertical load were investigated.\u0000Result: The maximum stress on the zirconia framework was observed in Model A (82.90 MPa), and the maximum stress on the tooth was observed in Model B (49.34 MPa). The maximum stress on the feldspathic porcelain has the highest value in Model A (21,860 MPa). The minimum stress on the tooth occurred in Model B and is 13.33 MPa. In the zirconia framework, the lowest stress is 11.54 MPa in Model B.\u0000Conclusions: Within the results of the study, it is clear that the framework design affects the force generated on the restoration and transmitted to the tooth. The results of the study will benefit dentists in determining the infrastructure design in zirconia-based restorations. Lingual band designs have been found successful.","PeriodicalId":31322,"journal":{"name":"Journal of International Clinical Dental Research Organization","volume":"48 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83747013","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}
Gökçen İrem Tolu, Neslihan Güntekin, R. Mohammadi, Mehmet Gökberkkaan Demirel
Aim: The aim of this study was to examine the effects of different preparation types and restorative materials on the endocrown restoration applied to endodontically treated maxillary first molar and the stress distribution on the related tissues. Methodology: A 3-dimensional (3D) image of a previously extracted intact tooth was obtained with CBCT. The resulting .dicom files were imported into the Mimics. Enamel, dentine and pulp were separated and extracted as an STL file. 4 different groups were determined and prepared in SolidWorks. The 3D images were imported into the relevant finite element analysis software (ABAQUS), and a load of 600 N was applied at the occlusal area of each model in the axial direction. Models are divided into 3 groups according to material type: Vita Suprinity (VS; VITA Zahnfabrik), Cerasmart (CS; GC Corp.), and Shofu Block HC (SB; Shofu). There is also a type of cement is used: RelyX ARC (3M ESPE). Results: Regardless of the results, any stresses on any tissue or restoration were not above the strength limits. In models with cusp preparation, the stress on the dental tissues was lower. In addition, higher stress was generally observed in groups where the lingual area was healthy. On the other hand, the stress occurring in zirconia-reinforced glass ceramics (VS) is higher compared to ceramic materials with a resin matrix (CS, SB). It has been determined that the stress transmitted to the supporting tissues is lower. Conclusion: As a result, endocrown restorations can be used in the restoration of endodontically treated first molars. In addition, when endocrown restoration is applied to molars with only one healthy area and excessive loss of coronal structure, reducing the cusp will be beneficial in terms of the distribution of stress on the healthy tissues.
{"title":"The effect of occlusal reduction and different CAD/CAM materials on stress distribution in endocrown restorations: A 3D finite element analysis","authors":"Gökçen İrem Tolu, Neslihan Güntekin, R. Mohammadi, Mehmet Gökberkkaan Demirel","doi":"10.5577/intdentres.461","DOIUrl":"https://doi.org/10.5577/intdentres.461","url":null,"abstract":"Aim: The aim of this study was to examine the effects of different preparation types and restorative materials on the endocrown restoration applied to endodontically treated maxillary first molar and the stress distribution on the related tissues.\u0000Methodology: A 3-dimensional (3D) image of a previously extracted intact tooth was obtained with CBCT. The resulting .dicom files were imported into the Mimics. Enamel, dentine and pulp were separated and extracted as an STL file. 4 different groups were determined and prepared in SolidWorks. The 3D images were imported into the relevant finite element analysis software (ABAQUS), and a load of 600 N was applied at the occlusal area of each model in the axial direction. Models are divided into 3 groups according to material type: Vita Suprinity (VS; VITA Zahnfabrik), Cerasmart (CS; GC Corp.), and Shofu Block HC (SB; Shofu). There is also a type of cement is used: RelyX ARC (3M ESPE).\u0000Results: Regardless of the results, any stresses on any tissue or restoration were not above the strength limits. In models with cusp preparation, the stress on the dental tissues was lower. In addition, higher stress was generally observed in groups where the lingual area was healthy. On the other hand, the stress occurring in zirconia-reinforced glass ceramics (VS) is higher compared to ceramic materials with a resin matrix (CS, SB). It has been determined that the stress transmitted to the supporting tissues is lower.\u0000Conclusion: As a result, endocrown restorations can be used in the restoration of endodontically treated first molars. In addition, when endocrown restoration is applied to molars with only one healthy area and excessive loss of coronal structure, reducing the cusp will be beneficial in terms of the distribution of stress on the healthy tissues. ","PeriodicalId":31322,"journal":{"name":"Journal of International Clinical Dental Research Organization","volume":"28 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75350091","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}
Aim: The aim of the study is to compare the stresses cause of different crown heights on short implants with different lengths, diameters and designs under axial and oblique loads on the cortical bone and implant system using finite element analysis. Methodology: In the atrophic posterior mandible, 4 different implants of different sizes and designs were placed in the first molar region. Metal supported porcelain crowns with three different heights (10 mm, 12.5 mm, 15 mm) were designed on computer. Total of 12 study models were created. Axial and oblique loads were applied and by finite element analysis method Von Mises values in implant and abutment; maximum and minimum principal stress values in cortical bone were evaluated. Results Compared to axial load, significantly higher stress values were found at implant and cortical bone in obliquelly loaded models. As the length and diameter of the implant increased, the stresses on the cortical bone decreased. Compared to the threaded implant, the plateau design implant caused less stress on the bone under vertical loads, while causing more stress on the oblique. Unlike to the literature, it was observed that the stresses on the implant was higher in the larger diameter implant compared to the narrower. Conclusions As a result of the stress values obtained within the limits of the analysis, when the lengths of the crowns restored on short implants were compared, it was determined that the axial forces were at an acceptable level under all conditions.
{"title":"Influence of different crown heights on shorter implants with different lengths, diameters, and designs at atrophic posterior mandible: A finite element analysis","authors":"Elif İrem Mahmutoğlu, S. Agüloğlu","doi":"10.5577/intdentres.430","DOIUrl":"https://doi.org/10.5577/intdentres.430","url":null,"abstract":"Aim: The aim of the study is to compare the stresses cause of different crown heights on short implants with different lengths, diameters and designs under axial and oblique loads on the cortical bone and implant system using finite element analysis. \u0000Methodology: In the atrophic posterior mandible, 4 different implants of different sizes and designs were placed in the first molar region. Metal supported porcelain crowns with three different heights (10 mm, 12.5 mm, 15 mm) were designed on computer. Total of 12 study models were created. Axial and oblique loads were applied and by finite element analysis method Von Mises values in implant and abutment; maximum and minimum principal stress values in cortical bone were evaluated. \u0000Results \u0000Compared to axial load, significantly higher stress values were found at implant and cortical bone in obliquelly loaded models. As the length and diameter of the implant increased, the stresses on the cortical bone decreased. Compared to the threaded implant, the plateau design implant caused less stress on the bone under vertical loads, while causing more stress on the oblique. \u0000Unlike to the literature, it was observed that the stresses on the implant was higher in the larger diameter implant compared to the narrower. \u0000Conclusions \u0000As a result of the stress values obtained within the limits of the analysis, when the lengths of the crowns restored on short implants were compared, it was determined that the axial forces were at an acceptable level under all conditions.","PeriodicalId":31322,"journal":{"name":"Journal of International Clinical Dental Research Organization","volume":"24 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85224167","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}
Aim: Observing and evaluating the long/short-term discoloration tendency of the esthetic prosthetic materials of lithium disilicate-based glass-ceramics (IPS e.max CAD LT) and leucite-based feldspathic glass-ceramics (VITA Mark II) materials, which are esthetically very close to each other at first glance. Methodology: 80 samples of A2 colored lithium disilicate and feldspathic blocks samples were overglazed and polished separately to evaluate the surface treatment procedures according to CIELAB color coordinates. For accelerated aging purposes, half of the examples were treated to red wine, and the other half were treated to coffee. Color changes were calculated using the ΔE formula. The results were put into record as ΔE-1, ΔE-2, and ΔE-3. Records of the results were evaluated using IBM SPSS Statistics Standard Concurrent User V 25 statistics package program. Data distribution regarding numerical variety and changes were evaluated using the Shapiro Wilk normality test and Q-Q graphics. Results: The data was evaluated using O'Brien clinical color tolerance scales. None of the samples has shown a perfect (ΔE=0-0.5) color match after 4 weeks of accelerated aging. Every group has shown results of significant statistical changes at various rates and percentages and divided into 4 subgroups as excellent, good, clinically acceptable and incompatible categories. Conclusion: Since aging procedures affect ceramic systems' ΔE values in a variety of ways, the aging protocol utilizing in vitro aging techniques for color changing should be evaluated alongside ceramic type and surface finishing procedures.
目的:观察和评价二硅酸锂基微晶玻璃(IPS e.max CAD LT)和白晶石基长石微晶玻璃(VITA Mark II)材料的长/短期变色趋势，这两种材料乍一看在美学上非常接近。方法:分别对80个A2色二硅酸锂和长石块样品进行复釉和抛光，根据CIELAB颜色坐标对表面处理程序进行评价。为了加速老化的目的，一半的样本被处理成红酒，另一半被处理成咖啡。使用ΔE公式计算颜色变化。结果被记录为ΔE-1， ΔE-2和ΔE-3。使用IBM SPSS Statistics Standard Concurrent User v25统计包程序对结果记录进行评价。采用Shapiro Wilk正态性检验和Q-Q图对数值变化的数据分布进行评价。结果:采用O'Brien临床颜色耐受性量表对数据进行评估。经过4周的加速老化，没有一个样品显示出完美的颜色匹配(ΔE=0-0.5)。各组在不同的发生率和百分比上均显示出显著的统计学变化，并分为优、良、临床可接受和不相容4个亚组。结论:由于老化过程以多种方式影响陶瓷系统的ΔE值，因此应与陶瓷类型和表面处理过程一起评估利用体外老化技术进行颜色变化的老化方案。
{"title":"Evaluating the color stability of two esthetic ceramic materials after different surface treatments and accelerated aging procedures","authors":"Özge Gül, S. Agüloğlu","doi":"10.5577/intdentres.426","DOIUrl":"https://doi.org/10.5577/intdentres.426","url":null,"abstract":"Aim: Observing and evaluating the long/short-term discoloration tendency of the esthetic prosthetic materials of lithium disilicate-based glass-ceramics (IPS e.max CAD LT) and leucite-based feldspathic glass-ceramics (VITA Mark II) materials, which are esthetically very close to each other at first glance. \u0000Methodology: 80 samples of A2 colored lithium disilicate and feldspathic blocks samples were overglazed and polished separately to evaluate the surface treatment procedures according to CIELAB color coordinates. For accelerated aging purposes, half of the examples were treated to red wine, and the other half were treated to coffee. Color changes were calculated using the ΔE formula. The results were put into record as ΔE-1, ΔE-2, and ΔE-3. Records of the results were evaluated using IBM SPSS Statistics Standard Concurrent User V 25 statistics package program. Data distribution regarding numerical variety and changes were evaluated using the Shapiro Wilk normality test and Q-Q graphics. \u0000Results: The data was evaluated using O'Brien clinical color tolerance scales. None of the samples has shown a perfect (ΔE=0-0.5) color match after 4 weeks of accelerated aging. Every group has shown results of significant statistical changes at various rates and percentages and divided into 4 subgroups as excellent, good, clinically acceptable and incompatible categories. \u0000Conclusion: Since aging procedures affect ceramic systems' ΔE values in a variety of ways, the aging protocol utilizing in vitro aging techniques for color changing should be evaluated alongside ceramic type and surface finishing procedures. ","PeriodicalId":31322,"journal":{"name":"Journal of International Clinical Dental Research Organization","volume":"7 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87525330","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 : 2022-08-31DOI: 10.5577/intdentres.2022.vol12.no2.7
Melis Seki Yurdakul, Pamir Meriç
Skeletal and dental correction obtained by orthodontic treatment may tend to return to the pre-treatment state. This condition is defined as relapse. The retention phase applied after treatment is important to obtain stable results. Periodontium, soft tissue pressures, growth and occlusion are among the factors affecting stability. In the last decade, interest in retention procedures has increased and it has been found that retention regimes differ from country to country. Although retention affects nearly every patient, there is minimal agreement on the most appropriate approach to be taken in an individual case. The many variations of the retention procedure, the introduction of different materials for retention, or individual patient factors are among the reasons that lead to difficulties in selecting retention protocols. Basic retention protocol is provided with removable and fixed retention appliances. For removable retention, hawley, wraparound, vacuum formed retention appliance and positioners are used. For fixed retention, rigid steel retention wire bonded to terminal teeth or flexible retention wires bonded to all teeth between 3-3 can be preferred. NiTi retention wires produced with CAD / CAM technology are also among the current materials. While fixed retention appliances do not require patient cooperation, periodontal follow-up is recommended. Patient cooperation is needed for the use of removable retention appliances, but easy cleaning of removable appliances is an advantage. ‘Adjunct’ procedures may also be applied to the teeth or surrounding periodontium to assist the retention process. For example, it involves reshaping teeth such as interproximal reduction or circumferential supracrestal fiberotomy. In this review, information about retention is discussed in the light of current literature. How to cite this article: Seki Yurdakul M, Meriç P. Retention in Orthodontics: A review. Int Dent Res 2022;12(2):88-96. https://doi.org/10.5577/intdentres.2022.vol12.no2.7 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.
通过正畸治疗获得的骨骼和牙齿矫正可能倾向于恢复到治疗前的状态。这种情况被定义为复发。处理后的保留相对于获得稳定的结果非常重要。牙周组织、软组织压力、生长和咬合是影响稳定性的因素。在过去十年中，人们对保留程序的兴趣有所增加，并发现各国的保留制度各不相同。尽管几乎每个患者都会受到滞留的影响，但对于个别病例采取的最合适的方法，人们的意见却很少。留置程序的多种变化，留置材料的不同引入，或个体患者因素是导致选择留置方案困难的原因之一。基本保留协议提供可移动和固定的保留装置。对于可移动的固定装置，采用霍利式，环绕式，真空形成的固定装置和定位器。对于固定固位，可以选择刚性钢丝粘接在终端齿或柔性钢丝粘接在3-3之间的所有齿。采用CAD / CAM技术生产的镍钛保持丝也是目前使用的材料之一。虽然固定固位器不需要患者配合，但建议进行牙周随访。使用可移动的固位器需要患者的配合，但易于清洁可移动的器具是一个优势。“辅助”程序也可应用于牙齿或周围牙周组织，以协助固位过程。例如，它包括牙齿重塑，如近端间复位或周向截骨上纤维切开术。在这篇综述中，结合现有文献讨论了关于记忆的信息。本文引用方式:Seki Yurdakul M, Meriç P.正畸固位:综述。国际医学杂志，2016;12(2):88-96。https://doi.org/10.5577/intdentres.2022.vol12.no2.7语言修改:本手稿中的英语已由至少两名专业编辑检查，他们都是英语母语者。
{"title":"Retention in Orthodontics: A review","authors":"Melis Seki Yurdakul, Pamir Meriç","doi":"10.5577/intdentres.2022.vol12.no2.7","DOIUrl":"https://doi.org/10.5577/intdentres.2022.vol12.no2.7","url":null,"abstract":"Skeletal and dental correction obtained by orthodontic treatment may tend to return to the pre-treatment state. This condition is defined as relapse. The retention phase applied after treatment is important to obtain stable results. Periodontium, soft tissue pressures, growth and occlusion are among the factors affecting stability. In the last decade, interest in retention procedures has increased and it has been found that retention regimes differ from country to country. Although retention affects nearly every patient, there is minimal agreement on the most appropriate approach to be taken in an individual case. The many variations of the retention procedure, the introduction of different materials for retention, or individual patient factors are among the reasons that lead to difficulties in selecting retention protocols. Basic retention protocol is provided with removable and fixed retention appliances. For removable retention, hawley, wraparound, vacuum formed retention appliance and positioners are used. For fixed retention, rigid steel retention wire bonded to terminal teeth or flexible retention wires bonded to all teeth between 3-3 can be preferred. NiTi retention wires produced with CAD / CAM technology are also among the current materials. While fixed retention appliances do not require patient cooperation, periodontal follow-up is recommended. Patient cooperation is needed for the use of removable retention appliances, but easy cleaning of removable appliances is an advantage. ‘Adjunct’ procedures may also be applied to the teeth or surrounding periodontium to assist the retention process. For example, it involves reshaping teeth such as interproximal reduction or circumferential supracrestal fiberotomy. In this review, information about retention is discussed in the light of current literature.\u0000 \u0000How to cite this article: \u0000Seki Yurdakul M, Meriç P. Retention in Orthodontics: A review. Int Dent Res 2022;12(2):88-96. https://doi.org/10.5577/intdentres.2022.vol12.no2.7\u0000 \u0000Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.","PeriodicalId":31322,"journal":{"name":"Journal of International Clinical Dental Research Organization","volume":"42 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80788509","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 : 2022-08-31DOI: 10.5577/intdentres.2022.vol12.no2.a3
M. Eskitaşçıoğlu, Derya Toprak Gündüz, Zelal Seyfioğlu Polat, Emine Göncü Başaran, Emrah Ayna
Aim: Post systems are crucial for the treatment of endodontically treated teeth with excessive crown destruction. Currently, increase in esthetic demands has increased the use of tooth-colored post systems. The aim of this study was to evaluate compression-shear strength after the application of different resin cements and different surface treatments to zirconia post-cores produced by the CAD-CAM milling technique. Methodology: One hundred twenty crown parts of maxillary central incisors were cut using a 2-mm enamel–cement joint using a water-cooled diamond bur in an air turbine handpiece at 300,000 rpm. Root canals with the same diameter were prepared using Gates-Glidden drills and Snowpost system drills. According to the enlarged canal, zirconia posts were prepared by the CAD-CAM copy-milling technique, and the zirconia post surfaces were roughened by different techniques (hydrofluoric acid, Al2O3 partial abrasion, CoJet silica coating). The roughened posts were cemented to the tooth canal using three resin cements: 10-Methacryloyloxydecyl dihydrogen phosphate (MDP)-containing cement, Bis-GMA-based resin, and resin-based adhesive. As the control group, the zirconia post surfaces with no application were fixed using three resin cements. The specimens were set down into 25x25x25 mm fabricated blocks with acrylic resin materials. Compression-shear strength tests of the prepared samples were conducted on the Instron Testing Machine by using appropriate equipment. Results: In summary, the combination of roughening techniques such as Al2O3 partial etching and CoJet silica coating using cement-containing MDP rendered the highest compression-shear strength. Conclusion: This in vitro study proposes the cementation of zirconia post-cores etched by Cojet silica coating and Al2O3 particles using MDP-containing resin cement. How to cite this article: Eskitaşçıoğlu M, Toprak Gündüz D, Seyfioğlu Polat Z, Göncü Başaran E, Ayna E. Effects of different surface treatments on the compression-shear strength of CAD-CAM zirconia posts. Int Dent Res 2022;12(2):55-61. https://doi.org/10.5577/intdentres.2022.vol12.no2.a3 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.
目的:桩系统是至关重要的治疗牙根管治疗过度破坏冠。目前，审美需求的增加增加了牙色柱系统的使用。本研究的目的是评估不同树脂胶结剂和不同表面处理方法对CAD-CAM铣削技术生产的氧化锆桩芯的压剪强度。方法:采用水冷式金刚石刀在空气涡轮机头中以300,000 rpm的转速切割120个上颌中切牙冠部分，采用2mm的牙釉质-水泥连接。采用Gates-Glidden钻和Snowpost系统钻制备直径相同的根管。根据扩大的管道，采用CAD-CAM仿铣削技术制备氧化锆桩，并采用氢氟酸、Al2O3局部磨蚀、CoJet二氧化硅涂层等不同工艺对氧化锆桩表面进行粗化处理。将粗化后的桩用三种树脂胶结剂(含10-甲基丙烯酰氧癸基磷酸二氢(MDP))胶结剂、bis - gma基树脂和树脂基胶粘剂)粘接在牙管上。作为对照组，使用三种树脂胶结剂固定未经应用的氧化锆桩表面。用丙烯酸树脂材料将试件放入25x25x25 mm的预制块中。采用合适的设备，在Instron试验机上对制备的试样进行压剪强度试验。结果:综上所述，Al2O3部分蚀刻和CoJet二氧化硅涂层等粗化技术结合使用含水泥的MDP可以获得最高的压剪强度。结论:采用含mdp的树脂水泥对Cojet二氧化硅涂层和Al2O3颗粒刻蚀的氧化锆桩核进行了体外胶结。本文来源:Eskitaşçıoğlu M, Toprak g nd Z D, Seyfioğlu Polat Z, Göncü ba aran E, Ayna E.不同表面处理对CAD-CAM氧化锆桩抗压抗剪强度的影响。国际医学杂志，2016;12(2):55-61。https://doi.org/10.5577/intdentres.2022.vol12.no2.a3语言修改:本手稿中的英语已由至少两名专业编辑检查，他们都是英语母语者。
{"title":"Effects of different surface treatments on the compression-shear strength of CAD-CAM zirconia posts","authors":"M. Eskitaşçıoğlu, Derya Toprak Gündüz, Zelal Seyfioğlu Polat, Emine Göncü Başaran, Emrah Ayna","doi":"10.5577/intdentres.2022.vol12.no2.a3","DOIUrl":"https://doi.org/10.5577/intdentres.2022.vol12.no2.a3","url":null,"abstract":"Aim: Post systems are crucial for the treatment of endodontically treated teeth with excessive crown destruction. Currently, increase in esthetic demands has increased the use of tooth-colored post systems. The aim of this study was to evaluate compression-shear strength after the application of different resin cements and different surface treatments to zirconia post-cores produced by the CAD-CAM milling technique.\u0000Methodology: One hundred twenty crown parts of maxillary central incisors were cut using a 2-mm enamel–cement joint using a water-cooled diamond bur in an air turbine handpiece at 300,000 rpm. Root canals with the same diameter were prepared using Gates-Glidden drills and Snowpost system drills. According to the enlarged canal, zirconia posts were prepared by the CAD-CAM copy-milling technique, and the zirconia post surfaces were roughened by different techniques (hydrofluoric acid, Al2O3 partial abrasion, CoJet silica coating). The roughened posts were cemented to the tooth canal using three resin cements: 10-Methacryloyloxydecyl dihydrogen phosphate (MDP)-containing cement, Bis-GMA-based resin, and resin-based adhesive. As the control group, the zirconia post surfaces with no application were fixed using three resin cements. The specimens were set down into 25x25x25 mm fabricated blocks with acrylic resin materials. Compression-shear strength tests of the prepared samples were conducted on the Instron Testing Machine by using appropriate equipment.\u0000Results: In summary, the combination of roughening techniques such as Al2O3 partial etching and CoJet silica coating using cement-containing MDP rendered the highest compression-shear strength.\u0000Conclusion: This in vitro study proposes the cementation of zirconia post-cores etched by Cojet silica coating and Al2O3 particles using MDP-containing resin cement.\u0000 \u0000How to cite this article: \u0000Eskitaşçıoğlu M, Toprak Gündüz D, Seyfioğlu Polat Z, Göncü Başaran E, Ayna E. Effects of different surface treatments on the compression-shear strength of CAD-CAM zirconia posts. Int Dent Res 2022;12(2):55-61. https://doi.org/10.5577/intdentres.2022.vol12.no2.a3\u0000 \u0000Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.","PeriodicalId":31322,"journal":{"name":"Journal of International Clinical Dental Research Organization","volume":"4 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82973328","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 : 2022-08-31DOI: 10.5577/intdentres.2022.vol12.no2.5
M. Balki, Mehmet Doğru
Aim: In this study, we aimed to compare the two-dimensional predictions made by two computer software packages with the postoperative values, and thus to evaluate the clinical reliability of digital orthognathic surgery planning. Methodology: Orthodontic treatment was performed before orthognathic surgery, and the same surgical team performed double-jaw orthognathic surgeries. We included 20 individuals (10 females, 10 males) with skeletal Class III malocclusion. The average age of the individuals was 21.5 years. In our study, the amount of movement was determined using reference lines on lateral cephalometric radiographs obtained from the preoperative and postoperative Cone-Beam Computed Tomography (CBCT) records of 20 individuals. Prediction profiles were formed using Dolphin Imaging (Dolphin Imaging & Management Solutions, Chatsworth, CA, USA) and NemoFAB 2D (Software Nemotec, S.L, Spain) computer softwares. In this way, the reliability and consistency of two-dimensional prediction software were examined. Results: The prediction profiles obtained from the computer software were compared with lateral cephalometric radiographs of the postoperative surgery results for 37 cephalometric parameters. There were no significant differences between software predictions and postoperative results in any cephalometric parameters. Conclusion: The plans and predictions made with the two computer software packages were reliable and can be used clinically. How to cite this article: Balkı M, Doğru M. Evaluation of two different imaging software programs in planning orthognathic surgery cases. Int Dent Res 2022;12(2):70-81. https://doi.org/10.5577/intdentres.2022.vol12.no2.5 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.
目的:在本研究中，我们旨在将两种计算机软件包的二维预测与术后值进行比较，从而评估数字正颌手术计划的临床可靠性。方法:在正颌手术前进行正畸治疗，同一外科团队进行双颌正颌手术。我们纳入了20例骨骼III类错颌畸形患者(10例女性，10例男性)。这些人的平均年龄为21.5岁。在我们的研究中，使用从术前和术后锥形束计算机断层扫描(CBCT)记录中获得的侧位头颅x线片上的参考线来确定活动量。使用Dolphin Imaging (Dolphin Imaging & Management Solutions, Chatsworth, CA, USA)和NemoFAB 2D (Software Nemotec, S.L, Spain)计算机软件形成预测剖面。通过这种方法，检验了二维预测软件的可靠性和一致性。结果:将计算机软件预测的37个颅侧位x线片与术后手术结果的颅侧位x线片进行比较。在任何头颅测量参数方面，软件预测与术后结果没有显著差异。结论:两种计算机软件包制定的计划和预测是可靠的，可用于临床。如何引用这篇文章:balkki M, Doğru M.两种不同成像软件程序在计划正颌手术病例中的评估。国际医学杂志，2016;12(2):70-81。https://doi.org/10.5577/intdentres.2022.vol12.no2.5语言修改:本手稿中的英语已由至少两名专业编辑检查，他们都是英语母语者。
{"title":"Evaluation of two different imaging software programs in planning orthognathic surgery cases","authors":"M. Balki, Mehmet Doğru","doi":"10.5577/intdentres.2022.vol12.no2.5","DOIUrl":"https://doi.org/10.5577/intdentres.2022.vol12.no2.5","url":null,"abstract":"Aim: In this study, we aimed to compare the two-dimensional predictions made by two computer software packages with the postoperative values, and thus to evaluate the clinical reliability of digital orthognathic surgery planning.\u0000Methodology: Orthodontic treatment was performed before orthognathic surgery, and the same surgical team performed double-jaw orthognathic surgeries. We included 20 individuals (10 females, 10 males) with skeletal Class III malocclusion. The average age of the individuals was 21.5 years. In our study, the amount of movement was determined using reference lines on lateral cephalometric radiographs obtained from the preoperative and postoperative Cone-Beam Computed Tomography (CBCT) records of 20 individuals. Prediction profiles were formed using Dolphin Imaging (Dolphin Imaging & Management Solutions, Chatsworth, CA, USA) and NemoFAB 2D (Software Nemotec, S.L, Spain) computer softwares. In this way, the reliability and consistency of two-dimensional prediction software were examined.\u0000Results: The prediction profiles obtained from the computer software were compared with lateral cephalometric radiographs of the postoperative surgery results for 37 cephalometric parameters. There were no significant differences between software predictions and postoperative results in any cephalometric parameters.\u0000Conclusion: The plans and predictions made with the two computer software packages were reliable and can be used clinically.\u0000 \u0000How to cite this article: \u0000Balkı M, Doğru M. Evaluation of two different imaging software programs in planning orthognathic surgery cases. Int Dent Res 2022;12(2):70-81. https://doi.org/10.5577/intdentres.2022.vol12.no2.5\u0000 \u0000Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.","PeriodicalId":31322,"journal":{"name":"Journal of International Clinical Dental Research Organization","volume":"46 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87178338","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 : 2022-08-31DOI: 10.5577/intdentres.2022.vol12.no2.4
Server Mutluay Ünal
Aim: The aim of this study was to compare the effects of powder, mat, and sheet forms of graphene and polyvinylpyrrolidone (PVP) on the bending strength of polymethyl methacrylate (PMMA). Methodology: A total of 75 PMMA samples (64 x 13 x 3 mm) were obtained and separated into five groups of 15, one of which was the control group. No strengthening material was added to the control group samples. In the PMMA+Polyvinylpyrrolidone powder (PVPP) (Group B) and PMMA+Graphene powder (GP) groups (Group D), PVP (0.5%) and graphene (0.01%) powders, respectively were added to the PMMA. In the PMMA+Polyvinylpryrolidone fiber mat (PVPM) (Group C) and PMMA+Graphene sheet (GS) groups (Group E), a PVP mat and graphene sheet, respectively were placed in the center of a square PMMA resin mold. To measure the samples’ resistance to bending, the three-point bending test (ISO 1567) was applied. Fracture lines were examined under a scanning electron microscope (SEM), and bending strength was analyzed using one-way analysis of variance (ANOVA). Results: A statistically significant difference was determined between the GS (118.5093 ± 11.94859 Mpa) and PVPP (105.5267 ± 6.80595 Mpa) groups. The mean bending resistance values were numerically higher in the PVPM (115.8487 ± 17.15440), GS (118.5093 ± 11.94859), and GP (116.2680 ± 16.03207) groups compared to the control group (108.2407 ± 24.23104). The graphene sheets and PVP mats showed higher resistance to bending than the powder form of either material. Conclusion: In clinical dental prosthesis use, PVP mats and graphene sheets are preferable with respect to both PMMA strengthening and color. How to cite this article: Mutluay Ünal S. A comparison of the effect of different forms of Graphene and Polyvinylpyrrolidone on physically strengthening PMMA. Int Dent Res 2022;12(2):62-9. https://doi.org/10.5577/intdentres.2022.vol12.no2.4 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.
{"title":"A comparison of the effect of different forms of Graphene and Polyvinylpyrrolidone on physically strengthening PMMA","authors":"Server Mutluay Ünal","doi":"10.5577/intdentres.2022.vol12.no2.4","DOIUrl":"https://doi.org/10.5577/intdentres.2022.vol12.no2.4","url":null,"abstract":"Aim: The aim of this study was to compare the effects of powder, mat, and sheet forms of graphene and polyvinylpyrrolidone (PVP) on the bending strength of polymethyl methacrylate (PMMA).\u0000Methodology: A total of 75 PMMA samples (64 x 13 x 3 mm) were obtained and separated into five groups of 15, one of which was the control group. No strengthening material was added to the control group samples. In the PMMA+Polyvinylpyrrolidone powder (PVPP) (Group B) and PMMA+Graphene powder (GP) groups (Group D), PVP (0.5%) and graphene (0.01%) powders, respectively were added to the PMMA. In the PMMA+Polyvinylpryrolidone fiber mat (PVPM) (Group C) and PMMA+Graphene sheet (GS) groups (Group E), a PVP mat and graphene sheet, respectively were placed in the center of a square PMMA resin mold. To measure the samples’ resistance to bending, the three-point bending test (ISO 1567) was applied. Fracture lines were examined under a scanning electron microscope (SEM), and bending strength was analyzed using one-way analysis of variance (ANOVA).\u0000Results: A statistically significant difference was determined between the GS (118.5093 ± 11.94859 Mpa) and PVPP (105.5267 ± 6.80595 Mpa) groups. The mean bending resistance values were numerically higher in the PVPM (115.8487 ± 17.15440), GS (118.5093 ± 11.94859), and GP (116.2680 ± 16.03207) groups compared to the control group (108.2407 ± 24.23104). The graphene sheets and PVP mats showed higher resistance to bending than the powder form of either material.\u0000Conclusion: In clinical dental prosthesis use, PVP mats and graphene sheets are preferable with respect to both PMMA strengthening and color.\u0000 \u0000How to cite this article: \u0000Mutluay Ünal S. A comparison of the effect of different forms of Graphene and Polyvinylpyrrolidone on physically strengthening PMMA. Int Dent Res 2022;12(2):62-9. https://doi.org/10.5577/intdentres.2022.vol12.no2.4\u0000 \u0000Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.","PeriodicalId":31322,"journal":{"name":"Journal of International Clinical Dental Research Organization","volume":"5 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76979990","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 : 2022-08-31DOI: 10.5577/intdentres.2022.vol12.no2.6
Nazan Yırgın Akgül, F. Haznedaroğlu, Çagla Vardar
Aim: The aim of this ex vivo study was to compare the amount of debris extruded during retreatment using stainless steel hand files (Hedstroem files) and R-Endo Nickel Titanium rotary instruments. Methodology: Eighty single-rooted freshly extracted human mandibular premolars were divided into two groups consisting of 40 teeth each. Retreatment was performed with R-Endo (Micro-Mega, Besançon, France) and Hedstroem files (Dentsply, Maillefer, Ballaigeus, Switzerland). The experimental teeth were obturated with lateral condensation technique. Then, 1.5-mL Eppendorf tubes were used to collecting the material that was extruded during preparation by subtracting post-instrumentation weight from pre-instrumentation weight. Results: There were significant differences in the amount of debris extruded between the groups (p<0.001). The amount of apical extrusion in the R-Endo group was determined to be less than in the hand instrumentation group. Conclusion: Within the limitations of this study, it might be concluded that all tested instruments resulted in apical extrusion of debris. During endodontic retreatment procedures, the hand files extruded a significantly higher amount of debris than the R-Endo. How to cite this article: Yırgın Akgül N, Haznedaroğlu F, Vardar Ç. Evaluation of apical extrusion of debris during retreatment: R-Endo rotary instruments versus hand files. Int Dent Res 2022;12(2):82-7. https://doi.org/10.5577/intdentres.2022.vol12.no2.6 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.
目的:本离体研究的目的是比较使用不锈钢手锉(Hedstroem锉)和R-Endo镍钛旋转器械再处理时挤压出的碎片数量。方法:将80颗刚拔除的单根人下颌前磨牙分为两组，每组40颗。再治疗采用R-Endo (Micro-Mega, besanon，法国)和Hedstroem锉(Dentsply, Maillefer, Ballaigeus，瑞士)。采用侧缩技术对实验牙进行封闭。然后，用1.5 ml埃彭多夫管收集制备过程中挤出的材料，方法是用仪器前重量减去仪器后重量。结果:两组间挤出碎片量差异有统计学意义(p<0.001)。R-Endo组的根尖挤压量小于手部器械组。结论:在本研究的局限性内，可以得出结论，所有测试的器械都会导致碎片的根尖挤压。在根管再治疗过程中，手锉比R-Endo挤出更多的碎片。本文出处:Yırgın akg l N, Haznedaroğlu F, Vardar Ç。再治疗过程中对碎片根尖挤压的评价:R-Endo旋转器械与手锉。国际医学杂志，2016;12(2):82-7。https://doi.org/10.5577/intdentres.2022.vol12.no2.6语言修改:本手稿中的英语已由至少两名专业编辑检查，他们都是英语母语者。
{"title":"Evaluation of apical extrusion of debris during retreatment: R-Endo rotary instruments versus hand files","authors":"Nazan Yırgın Akgül, F. Haznedaroğlu, Çagla Vardar","doi":"10.5577/intdentres.2022.vol12.no2.6","DOIUrl":"https://doi.org/10.5577/intdentres.2022.vol12.no2.6","url":null,"abstract":"Aim: The aim of this ex vivo study was to compare the amount of debris extruded during retreatment using stainless steel hand files (Hedstroem files) and R-Endo Nickel Titanium rotary instruments.\u0000Methodology: Eighty single-rooted freshly extracted human mandibular premolars were divided into two groups consisting of 40 teeth each. Retreatment was performed with R-Endo (Micro-Mega, Besançon, France) and Hedstroem files (Dentsply, Maillefer, Ballaigeus, Switzerland). The experimental teeth were obturated with lateral condensation technique. Then, 1.5-mL Eppendorf tubes were used to collecting the material that was extruded during preparation by subtracting post-instrumentation weight from pre-instrumentation weight.\u0000Results: There were significant differences in the amount of debris extruded between the groups (p<0.001). The amount of apical extrusion in the R-Endo group was determined to be less than in the hand instrumentation group.\u0000Conclusion: Within the limitations of this study, it might be concluded that all tested instruments resulted in apical extrusion of debris. During endodontic retreatment procedures, the hand files extruded a significantly higher amount of debris than the R-Endo.\u0000 \u0000How to cite this article: \u0000Yırgın Akgül N, Haznedaroğlu F, Vardar Ç. Evaluation of apical extrusion of debris during retreatment: R-Endo rotary instruments versus hand files. Int Dent Res 2022;12(2):82-7. https://doi.org/10.5577/intdentres.2022.vol12.no2.6\u0000 \u0000Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.","PeriodicalId":31322,"journal":{"name":"Journal of International Clinical Dental Research Organization","volume":"43 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81140135","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 : 2022-08-31DOI: 10.5577/intdentres.2022.vol12.no2.8
R. Rajasekhar, Sooraj Soman, V. Sebastian, Sabir Muliyar, Nileena Mary Cherian
Assessment of periapical health is important for the diagnosis, treatment planning and evaluation of endodontic treatment outcome. Radiographic evaluation of the status of the teeth is the most common modality used for assessing the periapical condition. Therefore, different radiographic indexes have been developed, which are used widely in clinical and epidemiological studies. With the advances in imaging, three-dimensional imaging techniques using cone beam computed tomography (CBCT) are very popular now. Indexes based on CBCT which analyses the condition of tooth in different planes have found to give more accurate assessment of periapical conditions compared to conventional radiography. This review aims to summarize different indexes developed for assessing periapical health. How to cite this article: Rajasekhar R, Soman S, Sebastian VM, Muliyar S, Cherian NM. Indexes for periapical health evaluation - A review. Int Dent Res 2022;12(2):97-106. https://doi.org/10.5577/intdentres.2022.vol12.no2.8 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.
根尖周健康评估对牙髓治疗的诊断、治疗计划和疗效评价具有重要意义。放射学评估牙齿的状态是评估根尖周状况最常用的方法。因此，不同的放射学指标被开发出来，广泛应用于临床和流行病学研究。随着影像技术的发展，锥形束计算机断层扫描(CBCT)三维成像技术得到了广泛的应用。基于CBCT的指标分析了牙齿在不同平面上的状况，发现与常规x线摄影相比，CBCT能更准确地评估根尖周状况。本文综述了用于评价根尖周健康的不同指标。本文摘自:Rajasekhar R, Soman S, Sebastian VM, mulliyar S, Cherian NM。根尖周健康评价指标综述。国际医学杂志，2016;12(2):97-106。https://doi.org/10.5577/intdentres.2022.vol12.no2.8语言修改:本手稿中的英语已由至少两名专业编辑检查，他们都是英语母语者。
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