FORM DIFFERENCE COMPUTATIONS IN RESTORATIVE DENTISTRY

修复牙科中的形状差异计算

• 批准号: 2872152
• 负责人: MONA E MCALARNEY
• 金额: $ 8.87万
• 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/2872152
• 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（改编自研究者摘要）：形式（大小和形状） 物体之间的比较在以下方面是重要的：1）修复牙科学， 关于配合、磨损、咬合、应力/应变分布、质量控制 和设计分析; 2）生长和发育科学; 3）诊断， 治疗计划和许多临床问题的预后;以及4）身体 人类学 如果两个物体之间的形状比较充分， 通过描述，可以确定形式差异的根本原因。 这样的因果关系的信息，在修复牙科，然后建议; 1） 不同材料的加工工艺，2）材料的使用与 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学比较 技术将被使用，因为与传统的标量方法不同， 应变和从中获得的参数1）提供幅度和 形状变化的方向，2）可以在任何点上或在 结构，3）尺寸和形状变化可以分离，和4）是协调 系统独立。 目前的主要假设是张量 可以构造形态测量方法，该方法消除了许多，如果不是全部， 有限元缩放分析的限制，而不损害任何 优势 人为细分的局限性由 宏单元法，而同源标志的要求是 通过非地标方法解决。 有四个小假设：1） 这些形态测量方法在数值计算中提供了稳定的精确解。 模拟; 2）这些方法提供了额外的临床有用的 差异信息不能从其他技术中获得，并且可以 在一些重要的实验系统中进行了客观评估 包括i）石材复制精度，ii）铸造精度，以及iii） 眼睛生长过程; 3）这些方法提供的结果与 已建立的技术，如有限元缩放分析，欧几里德 距离矩阵分析，以及维度的百分比变化;以及4）这些 方法提供了比 其他技术。 结果，沿着技术本身， 提高精度，因此适合，闭塞，和临床寿命的任何 需要复制口腔结构和/或铸造的修复。 眼睛生长的研究可能会导致对所涉及的过程的深入了解， 对形状的影响 这些技术的重要性将超越 这项研究是因为：1）非标志性方法可以用来分析大多数 生物和假体结构，这些结构以前难以实现， 由于缺乏标志，张量研究，2）宏单元法 可以用于具有多个地标的结构，例如 颅面复合体，3）这些形式差异方法会使 最佳利用新的边界坐标评估技术。