FORM DIFFERENCE COMPUTATIONS IN RESTORATIVE DENTISTRY

修复牙科中的形状差异计算

• 批准号: 6150524
• 负责人: MONA E MCALARNEY
• 金额: $ 9.21万
• 依托单位: COLUMBIA UNIVERSITY HEALTH SCIENCES
• 依托单位国家: 美国
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-01 至 2002-01-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6150524
• 关键词: computer simulation; dental casting material; dental material wear; dental occlusion; eye; form /pattern perception; growth /development; mechanical stress; morphology; oral facial restoration; oral facial restoration material; performance; statistics /biometry

DESCRIPTION (Adapted from investigator's Abstract): Form (size and shape) comparisons between objects are important in; 1) restorative dentistry with respect to fit, wear, occlusion, stress/strain distribution, quality control and design analysis; 2) growth and development sciences; 3) the diagnosis, treatment planning, and prognosis of many clinical problems; and 4) physical anthropology. If the form comparison between two objects is adequately described, the underlying cause of form difference could be determined. Such causal information in restorative dentistry would then suggest; 1) different materials processing techniques, 2) the use of materials with different properties, and/or 3) design alterations leading to increased clinical performance. Strain based tensorial morphometric comparison techniques will be used since, unlike traditional scalar methods, principal strains and the parameters obtained from them 1) provide both magnitude and direction of form change, 2) can be determined at any point on or in the structure, 3) size and shape change can be segregated, and 4) are coordinate system independent. The major hypothesis present is that tensorial morphometric methods can be constructed which eliminate many, if not all, finite element scaling analysis limitations without compromising any of the advantages. The limitation of artificial subdivision is addressed by the macroelement method while the requirement of homologous landmarks is addressed by the nonlandmark method. There are four minor hypotheses: 1) these morphometric methods provide stable accurate solutions in numerical simulations; 2) these methods provide additional clinically useful difference information not obtainable from other techniques, and can be objectively assessed in a number of significant experimental systems including i) duplication accuracy in stone, ii) casting accuracy, and iii) eye growth processes; 3) these methods provide results which compare well to established techniques such as finite element scaling analysis, Euclidean distance matrix analysis, and percentage change in dimension; and 4) these methods provide a more complete description of form change than that of other techniques. The results, along with the techniques themselves, could increase accuracy and therefore fit, occlusion, and the clinical life of any restoration which requires duplication of oral structures and/or casting. The eye growth study could lead to insights into the processes involved and their effect on shape. The significance of the techniques would go beyond this study since; 1) the nonlandmark method could be used to analyze most biological and prosthetic structures which have previously eluded such tensorial study due to the paucity of landmarks, 2) the macroelement method could be used in structures which have a number of landmarks, such as the craniofacial complex, and 3) these form difference methods would make optimal use of the new boundary coordinate assessment techniques.

描述（改编自研究者的摘要）：形式（大小和形状） 对象之间的比较很重要： 1) 牙科修复 考虑贴合、磨损、咬合、应力/应变分布、质量控制 和设计分析； 2）生长与发育科学； 3）诊断， 许多临床问题的治疗计划和预后； 4) 身体方面 人类学。 如果两个物体之间的形式比较充分 通过描述，可以确定形状差异的根本原因。 修复牙科中的此类因果信息表明： 1） 不同材质的加工工艺，2）使用材质的搭配 不同的属性，和/或 3) 设计变更导致增加 临床表现。 基于应变的张量形态测量比较 将使用这些技术，因为与传统的标量方法不同，主要 应变和从它们获得的参数 1) 提供大小和 形状变化的方向，2）可以在上或中的任何点确定 结构，3）尺寸和形状变化可以分离，4）是坐标 系统独立。 目前的主要假设是张量 可以构建形态测量方法来消除许多（如果不是全部） 有限元缩放分析的局限性，而不影响任何 优点。 人工细分的局限性由 宏元素法，同源地标的要求是 通过非地标方法解决。 有四个小假设：1） 这些形态测量方法提供了稳定准确的数值解 模拟； 2）这些方法提供了额外的临床有用的 差异信息无法从其他技术获得，并且可以 在许多重要的实验系统中进行客观评估 包括 i) 石材的复制精度，ii) 铸造精度，以及 iii) 眼睛的生长过程； 3）这些方法提供的结果与 有限元尺度分析、欧几里得分析等成熟技术 距离矩阵分析和尺寸变化百分比； 4）这些 方法提供了比形式变化更完整的描述 其他技术。 结果以及技术本身可以 提高准确性，从而提高贴合度、咬合度和临床寿命 需要复制口腔结构和/或铸件的修复。 眼睛生长研究可以深入了解所涉及的过程和 它们对形状的影响。 这些技术的意义将超越 这项研究以来； 1）非地标方法可用于分析大多数 以前无法发现的生物和假体结构 由于缺乏地标而进行张量研究，2）宏观元素方法 可用于具有多个地标的结构，例如 颅面复合体，3）这些形式差异方法将使 新边界坐标评估技术的最佳使用。