FORM DIFFERENCE COMPUTATIONS IN RESTORATIVE DENTISTRY

描述(改编自调查人员摘要)：表格(大小和形状) 对象之间的比较在以下方面很重要：1)修复体牙科 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， 许多临床问题的治疗计划和预后；以及4)身体状况 人类学。如果两个对象之间的形式比较充分 描述后，就可以确定形式差异的根本原因。 这样的因果信息在修复体牙科中会暗示：1) 不同的材料加工技术，2)材料的使用 不同的属性，和/或3)设计更改导致 临床表现。基于应变的张量形态测量比较 与传统的标量方法不同，将使用技术，因为主体 应变和从它们获得的参数1)提供了大小和 形式改变的方向，2)可在上或内的任何点确定 结构，3)大小和形状变化可分离，4)协调 独立于系统。目前提出的主要假设是张量 可以构建形态测量方法，以消除许多，如果不是全部， 有限元比例分析限制，而不影响任何 优势。人工分舱的局限性由 宏元素方法，而同源地标的要求是 由非里程碑方法寻址。有四个较小的假设：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 从其他技术中无法获得的差异信息，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，如有限元标度分析，欧几里得 距离矩阵分析和维度的百分比变化；以及4)这些 方法提供了更完整的形式更改描述。 其他技术。结果，连同技术本身，可能会 提高准确性，从而提高适合性、遮挡性和临床寿命 需要复制口腔结构和/或铸型的修复。 眼睛生长研究可能导致对所涉及的过程和 它们对形状的影响。这些技术的意义将超越 本研究的主要原因是：1)非标志性方法可以用来分析大多数 生物和假体结构，以前没有这样的 地标稀少的张量研究，2)宏单元法 可用于具有多个地标的结构中，例如 和3)这些形式的不同方法将使 优化使用新的边界坐标评估技术。

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.