抄録
This paper reports on the different approach to establish the required digital wire design for the subsequent CAM data preparation, referred as B-code. The B-code consists of three parameters, known as wire feeding length (L), the rotation angle (β) and the bend angle (θ) which are designed to control the movement of the developing CNC dental wire bender machine through the feeding mechanism, the rotating mechanism and the bending mechanism, respectively. The previous works had discussed some different methods in generating the digital wire design and the present study explores the use of 2D dental image instead. In the present study, two interfaces have been adopted to realize the objective, which are the 2D image segmentation and also the 2D real time point selection. The use of these interfaces had been demonstrated through technical examples. Firstly, the initial contour of a lingual and labial arch curve is obtained from an input image, accordingly. A different number of iteration is tested during the active contour image segmentation procedure to extract an acceptable dental arch feature. Then, several 2D points are selected from the desired feature at a user specified zoom level to represent the lingual and labial arch contour. Those points are automatically fit into 2D linear interpolation which enable the approximation of these arch curvesto be visually conducted. The extraction of the pre-selected Cartesian XY coordinates of points is automatically executed through the written program and subsequently adopted for the CNC bending code (B-code) generation program. In addition to that, the mathematical representation of each generated curve is also defined by polynomials fourth and sixth-order.
