| 摘要 |
PURPOSE: A system for determining the changing time of crown and a method thereof are provided to determine the changing time of crown of a patient. CONSTITUTION: A method for determining the changing time of crown is as follows. A signal transmission block of a crown exchange timing system transmits one or more signal to a tooth(S210). A signal receiving block detects a signal refracted from a tooth(S220). A calculation block detects a signal transmission point of time and a signal receiving point of time and calculates difference between points of time(S230). The calculation block calculates the receiving point of a first deflection signal(S240). The time difference is calculated again(S250). The receiving point of the deflection signal is calculated(S260). A comparison block compares and analyzes the result of obtained from each process and determines the change of crown(S270). |
