JADA foundational science最新文献_第6页

Effects of abutment screw preload and preload simulation techniques on dental implant lifetime 基牙螺钉预压及预压模拟技术对种植体寿命的影响

JADA foundational science Pub Date : 2022-01-01 DOI: 10.1016/j.jfscie.2022.100010

Megha Satpathy BS , Rose M. Jose MS , Yuanyuan Duan MS, PhD , Jason A. Griggs PhD

{"title":"Effects of abutment screw preload and preload simulation techniques on dental implant lifetime","authors":"Megha Satpathy BS , Rose M. Jose MS , Yuanyuan Duan MS, PhD , Jason A. Griggs PhD","doi":"10.1016/j.jfscie.2022.100010","DOIUrl":"10.1016/j.jfscie.2022.100010","url":null,"abstract":"<div><h3>Background</h3><p>This study aimed to investigate how the predicted implant fatigue lifetime is affected by the loss of connector screw preload and the finite element analysis method used to simulate preload.</p></div><div><h3>Methods</h3><p>A dental implant assembly (DI1, Biomet-3i external hex; Zimmer Biomet) was scanned using microcomputed tomography and measured using Mimics software (Materialise) and an optical microscope. Digital replicas were constructed using SolidWorks software (Dassault Systèmes). The material properties were assigned in Abaqus (Dassault Systèmes). An external load was applied at 30° off-axial loading. Eight levels of connector screw preload (range, 0-32 Ncm) were simulated for DI1. This assembly and an additional model (DI2) having a longer and narrower screw were compared regarding their fatigue limits (using fe-safe software [Dassault Systèmes]) for 2 preloading methods: (1) adding preload torque or (2) adding bolt axial tension.</p></div><div><h3>Results</h3><p>The maximum von Mises stresses of DI1 (on the connector screw threads) with and without preload were 439.90 MPa and 587.90 MPa. The predicted fatigue limit was the same for preloads from 100% through 80% of the manufacturer’s recommendation and dropped precipitously between 80% and 70% preload. Adding a preload torque on the screw resulted in a more uniform stress distribution on the screw compared with bolt axial tension, especially for DI2, which had a longer and narrower screw than DI1.</p></div><div><h3>Conclusions</h3><p>A substantial loss of preload can be accommodated without compromising the fatigue resistance of this dental implant. Computer models should be constructed using torque instead of a bolt axial tension.</p></div>","PeriodicalId":73530,"journal":{"name":"JADA foundational science","volume":"1 ","pages":"Article 100010"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9873498/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10583860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Science is organized knowledge 科学是有组织的知识

JADA foundational science Pub Date : 2022-01-01 DOI: 10.1016/j.jfscie.2021.100001

Jack L. Ferracane PhD

引用次数: 0

The erosive potential of sugar-free waters on cervical dentin 无糖水对牙本质的侵蚀潜势

JADA foundational science Pub Date : 2022-01-01 DOI: 10.1016/j.jfscie.2022.100009

Scott D. Eckhart DDS, MPH, MS, CPH , John A. Brewster DDS, MS , Denice C. Curtis DDS, MPH, DHS

{"title":"The erosive potential of sugar-free waters on cervical dentin","authors":"Scott D. Eckhart DDS, MPH, MS, CPH , John A. Brewster DDS, MS , Denice C. Curtis DDS, MPH, DHS","doi":"10.1016/j.jfscie.2022.100009","DOIUrl":"10.1016/j.jfscie.2022.100009","url":null,"abstract":"<div><h3>Background</h3><p>It has been well-documented that highly acidic beverages containing sugar are capable of dental erosion. As dentin has a lower critical pH, it is more susceptible than enamel to erosion. This study aimed to examine the effect of sugar-free water beverages on the erosion of cervical dentin.</p></div><div><h3>Methods</h3><p>Eight beverages were selected, including a positive control and negative control. For each beverage, the pH (n = 5) and total acidity (n = 3) were determined with a digital pH meter. Freshly extracted human premolars were sectioned to create cervical dentin specimens (n = 48). Specimens were imaged using laser profilometry before and after the specimens were challenged with beverages for 24 hours. The 3-dimensional before and after scans were evaluated to determine the change in surface volume, erosion depth, and surface roughness. The data were analyzed with a Kruskal-Wallis with Dunn post hoc test (α = 0.05).</p></div><div><h3>Results</h3><p>The pH of all samples was less than 5.5, except for the negative control. Noncarbonated waters required significantly less base to neutralize the acid than carbonated beverages. A significant difference was realized through profilometry between the carbonated and noncarbonated beverages, with the former displaying increased volume loss, greater depth, and an amplified change in surface roughness.</p></div><div><h3>Conclusion</h3><p>Within the limitations of this study, carbonated beverages have greater potential to cause dentinal erosion. The low total acidity of the noncarbonated waters makes them more likely to be buffered in the oral environment than beverages with carbonation or higher total acidity.</p></div>","PeriodicalId":73530,"journal":{"name":"JADA foundational science","volume":"1 ","pages":"Article 100009"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772414X22000056/pdfft?md5=1677f439e174dfc479ef7f7bb0f7e115&pid=1-s2.0-S2772414X22000056-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"54466258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Show me “Bioactive!” 给我看看“生物活性”!

JADA foundational science Pub Date : 1900-01-01 DOI: 10.1016/j.jfscie.2023.100027

J. Ferracane

引用次数: 0

Survey of the mechanical and physical behaviors of yttria-stabilized zirconia from multiple dental laboratories 来自多个牙科实验室的氧化钇稳定氧化锆的力学和物理行为的调查

JADA foundational science Pub Date : 1900-01-01 DOI: 10.1016/j.jfscie.2022.100018

Yifeng Liao, Max Gruber, Henry Lukic, Jim McLees, Si Chen, A. Boghosian, S. Megremis

引用次数: 2

Analysis of the transparent surface layer formed at the surfaces of arrested enamel caries lesions with tomographic imaging methods 用层析成像方法分析釉质龋病变表面形成的透明表面层

JADA foundational science Pub Date : 1900-01-01 DOI: 10.1016/j.jfscie.2023.100025

Nai-Yuan N. Chang, Morgan Ng, Tina Dillas, Yi-Ching Ho, Yihua Zhu, D. Fried

引用次数: 0

Bioactive dental materials 生物活性牙科材料

JADA foundational science Pub Date : 1900-01-01 DOI: 10.1016/j.jfscie.2023.100022

J. Ferracane, S. Sidhu, M. Melo, I. Yeo, A. Diogenes, B. Darvell

引用次数: 2

Effectiveness of carbonate removal and demineralization inhibition in primary teeth using a 9.3-μm carbon dioxide laser 9.3 μm二氧化碳激光去除乳牙碳酸盐和抑制脱矿的效果

JADA foundational science Pub Date : 1900-01-01 DOI: 10.1016/j.jfscie.2022.100017

Ali H. Badreddine, V. Ramareddy, C. Kerbage

引用次数: 0

Molecular systems architecture of host-microbiome interactions in periodontitis 牙周炎中宿主-微生物相互作用的分子系统结构

JADA foundational science Pub Date : 1900-01-01 DOI: 10.1016/j.jfscie.2023.100026

PhD V. A. Shiva Ayyadurai, PhD Prabhakar Deonikar, Dmd PhD Philip Stashenko

引用次数: 0

The growth and dissolution of sodium fluoride hopper crystals 氟化钠漏斗晶体的生长和溶解

JADA foundational science Pub Date : 1900-01-01 DOI: 10.1016/j.jfscie.2022.100020

Alexis N. Frigyes, Jacqueline Holdren, W. Mchale, M. Latta, Stephen M. Gross

引用次数: 0