{"title":"Comparison of retentive force and wear pattern of Locator® and ADD-TOC attachments combined with CAD-CAM milled bar","authors":"Sung-Ki Chae, Won-Tak Cho, Jae-Won Choi, Eun-Bin Bae, Ji-Hyeon Bae, Gang-Ho Bae, Jung-Bo Huh","doi":"10.4047/jap.2022.14.1.12","DOIUrl":null,"url":null,"abstract":"PURPOSE The purpose of this study was to investigate changes in retention and wear pattern of Locator® and ADD-TOC attachments on a digital milled bar by performing chewing simulation and repeated insertion/removal of prostheses in fully edentulous models. MATERIALS AND METHODS Locator (Locator®; Zest Anchors Inc., Escondido, CA, USA) was selected as the control group and ADD-TOC (ADD-TOC; PNUAdd Co., Ltd., Busan, Republic of Korea) as the experimental group. A CAD-CAM milled bar was mounted on a master model and 3 threaded holes for connecting a bar attachment was formed using a tap. Locator and ADD-TOC attachments were then attached to the milled bar. Simulated mastication and repeated insertion/removal were performed over 400,000 cyclic loadings and 1,080 insertions/removals, respectively. Wear patterns on deformed attachment were investigated by field emission scanning electron microscopy. RESULTS For the ADD-TOC attachments, chewing simulation and repeated insertion/removal resulted in a mean initial retentive force of 24.43 ± 4.89 N, which were significantly lower than that of the Locator attachment, 34.33 ± 8.25 N (P < .05). Amounts of retention loss relative to baseline for the Locator and ADD-TOC attachments were 21.74 ± 7.07 and 8.98 ± 5.76 N (P < .05). CONCLUSION CAD-CAM milled bar with the ADD-TOC attachment had a lower initial retentive force than the Locator attachment. However, the ADD-TOC attachment might be suitable for long-term use as it showed less deformation and had a higher retentive force after simulated mastication and insertion/removal repetitions.","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Advanced Prosthodontics","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.4047/jap.2022.14.1.12","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}
引用次数: 2
Abstract
PURPOSE The purpose of this study was to investigate changes in retention and wear pattern of Locator® and ADD-TOC attachments on a digital milled bar by performing chewing simulation and repeated insertion/removal of prostheses in fully edentulous models. MATERIALS AND METHODS Locator (Locator®; Zest Anchors Inc., Escondido, CA, USA) was selected as the control group and ADD-TOC (ADD-TOC; PNUAdd Co., Ltd., Busan, Republic of Korea) as the experimental group. A CAD-CAM milled bar was mounted on a master model and 3 threaded holes for connecting a bar attachment was formed using a tap. Locator and ADD-TOC attachments were then attached to the milled bar. Simulated mastication and repeated insertion/removal were performed over 400,000 cyclic loadings and 1,080 insertions/removals, respectively. Wear patterns on deformed attachment were investigated by field emission scanning electron microscopy. RESULTS For the ADD-TOC attachments, chewing simulation and repeated insertion/removal resulted in a mean initial retentive force of 24.43 ± 4.89 N, which were significantly lower than that of the Locator attachment, 34.33 ± 8.25 N (P < .05). Amounts of retention loss relative to baseline for the Locator and ADD-TOC attachments were 21.74 ± 7.07 and 8.98 ± 5.76 N (P < .05). CONCLUSION CAD-CAM milled bar with the ADD-TOC attachment had a lower initial retentive force than the Locator attachment. However, the ADD-TOC attachment might be suitable for long-term use as it showed less deformation and had a higher retentive force after simulated mastication and insertion/removal repetitions.
本研究的目的是通过在完全无牙模型中进行咀嚼模拟和重复插入/移除假体,研究Locator®和ADD-TOC附件在数字铣削棒上的保留和磨损模式的变化。材料和方法选择定位器(Locator®;Zest Anchors股份有限公司,Escondido,CA,USA)作为对照组,选择ADD-TOC(ADD-TOC;PNUAdd Co.,有限公司,Busan,Republic of Korea)作为实验组。将CAD-CAM铣削棒材安装在主模型上,并使用丝锥形成用于连接棒材附件的3个螺纹孔。然后将定位器和ADD-TOC附件连接到铣削的棒材上。模拟咀嚼和重复插入/移除分别在400000次循环载荷和1080次插入/移除中进行。用场发射扫描电子显微镜研究了变形附着体的磨损规律。结果对于ADD-TOC附件,咀嚼模拟和重复插入/移除导致平均初始保持力为24.43±4.89N,显著低于定位器附件,34.33±8.25N(P<.05)。定位器和ADD-TOC附件相对于基线的滞留损失量分别为21.74±7.07和8.98±5.76N(P<.05)。然而,ADD-TOC附件可能适合长期使用,因为它在模拟咀嚼和插入/移除重复后显示出较小的变形并具有较高的保持力。
期刊介绍:
This journal aims to convey scientific and clinical progress in the field of prosthodontics and its related areas to many dental communities concerned with esthetic and functional restorations, occlusion, implants, prostheses, and biomaterials related to prosthodontics.
This journal publishes
• Original research data of high scientific merit in the field of diagnosis, function, esthetics and stomatognathic physiology related to prosthodontic rehabilitation, physiology and mechanics of occlusion, mechanical and biologic aspects of prosthodontic materials including dental implants.
• Review articles by experts on controversies and new developments in prosthodontics.
• Case reports if they provide or document new fundamental knowledge.