Finite element method modeling for individual malocclusions: development and application of the basic algorithm

Shin, Jung Woog; Nahm, Dong Seok; Kim, Tae Woo; Lee, Sung Jae

Abstract

The purpose of this study is to devlop the basic algorithm for the finite slsment method modeling of indivdual malocclusions. Usully, a great deal of time js spent in preprocessiong. To reduce the time required, we developed a stsndardized proccrdure for measuring the position of each tooth and a program to automatically preprocess. The following procedures were carride to complete this study. 1. Twenty-eigth teeth mofphologies were constructed three- dimensionally for the finite element analysis and saved as separate files. 2. Standard brackets were attached so that the FA points conincide with the center of the brackets. 3. The study model of a patient was made. 4. Using the study model, the crown inclination, and the vertical distance from the tip of a tooth was measured by using specially designed tools. 5. The arch form was determined from a picture of the model with an image processing technique. 6. The meadured data were input as a rotational matrix. 7. The program provides an output file containing the necessary information about the three-dimensional position of teeth, which is applicable to several finite element programs commonly used. The program for basic algorithm was made with Turbo-C and the subsequent outfile was applied to ANSYS. This standatdized model measuring procedure and the program reduce the time required, espccially for preprocessing and can be applied to other malocclusions easily.