Fatigue of Dental Implants

种植牙疲劳

• 批准号: 7392329
• 负责人: JASON A GRIGGS
• 金额: $ 24.24万
• 依托单位: UNIVERSITY OF MISSISSIPPI MED CTR
• 依托单位国家: 美国
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-04-01 至 2012-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7392329
• 关键词: Acceleration; Affect; American; Behavior; Bone Resorption; Caliber; Caring; Cementation; Communities; Data; Dental; Dental Implants; Dentists; Edentulous Mouth; Elements; Failure; Fatigue; Fracture; Frequencies; Future; Goals; Health; Height; Implant; Implantation procedure; In Vitro; Individual; Laws; Location; Log-Linear Models; Mandible; Mechanical Stress; Mechanics; Methods; Modeling; Neck; Numbers; Patients; Plastics; Population; Probability; Prosthesis; Range; Reporting; Research Personnel; Sampling; Shapes; Specific qualifier value; Specimen; Standards of Weights and Measures; Stress; Stress Fractures; Stress Tests; Testing; Time; Titanium; Tooth structure; alveolar bone; base; concept; design; edentulism; experience; improved; programs; research study; simulation

DESCRIPTION (provided by applicant): Although dental implants are not yet the standard of care for edentulous patients, the use of this treatment option is rapidly increasing. The number of implants placed in the US increased by a factor of ten from 1983 to 2002 with $150 million of implant products sold to North American dentists in 2002. In the absence of implant placement, edentulism poses a serious health concern for US citizens. Without a tooth or implant to transfer loading to the alveolar bone, patients experience bone resorption with an average decrease of 4 mm in mandibular height within one year. It has been suggested that with proper treatment, achieving stable biointegration is no longer the primary factor limiting the lifetimes of implants. Fatigue fracture of the implant or the prostheses supported by the implant due to mechanical factors is a more prevalent cause of failure. Implant body diameter, prosthesis cementation method, and implant-abutment connection design have all been reported to significantly affect abutment screw loosening and fracture. It is clear that the dental implant community would benefit from systemic comparisons of implant designs, but such studies are not feasible without more efficient fatigue testing methods. The following specific aims are focused around our central goal of developing an efficient method for testing reliability of dental implants: 1) Correlate the results of finite element stress analysis to the fracture origin observed on physical specimens. 2) Verify the accuracy of step-stress method for estimating the mechanical reliability of dental implants over time. 3) Determine an acceleration factor to allow conversion between fatigue data collected at different cyclic frequencies. In lay terms, this project will enable future researchers to improve dental products by faster methods.

描述（由申请人提供）：虽然种植牙还不是无牙颌患者的护理标准，但这种治疗方案的使用正在迅速增加。从 1983 年到 2002 年，美国种植牙的数量增加了十倍，2002 年向北美牙医销售了价值 1.5 亿美元的种植产品。在没有种植牙的情况下，缺牙症给美国公民带来了严重的健康问题。如果没有牙齿或种植体将负荷转移到牙槽骨，患者会出现骨吸收，下颌高度在一年内平均减少 4 毫米。有人建议，通过适当的治疗，实现稳定的生物整合不再是限制植入物寿命的主要因素。由于机械因素导致的种植体或由种植体支撑的假体的疲劳断裂是更常见的失败原因。据报道，种植体直径、假体粘接方法和种植体-基台连接设计都会显着影响基台螺钉松动和断裂。显然，牙种植体界将从种植体设计的系统比较中受益，但如果没有更有效的疲劳测试方法，此类研究是不可行的。以下具体目标围绕我们的中心目标，即开发一种有效的方法来测试牙种植体的可靠性：1）将有限元应力分析的结果与在物理样本上观察到的断裂起源相关联。 2) 验证阶跃应力法用于估计牙种植体随时间变化的机械可靠性的准确性。 3) 确定加速因子以允许在不同循环频率下收集的疲劳数据之间进行转换。通俗地说，该项目将使未来的研究人员能够通过更快的方法改进牙科产品。