Intraoral radiography is commonly used to diagnose dental carious and periodontal diseases of patients before dental therapy is administered. Recently it is reported that dental student's skill for intraoral radiography declines, because it is difficult to make enough practice time while in dental school. In the previous work, we have developed a desk-size prototype system using PHANToM Omni, but some problems with respect to size and accuracy were noted by the dentists. In this paper, we design a new positioning device of indicator cone for simulator and evaluate its positioning accuracy. After the system construction is complete, we validate this simulator with skilled dentists.
