![]() The working time for each impression was 120 seconds and the setting time was 150 seconds, which was observed by research personnel who did not provide instructions, answer questions, or intervene (except for safety reasons) with the subject while taking two sets of impressions.Īt the end of the visit, all subjects’ questions were answered, and a limited oral examination was performed to determine if any residual impression material was left after the impression tray removal. They then followed the criteria outlined in the ITG, and the sequence of taking an upper or lower impression was randomized. Subjects started by taking two sets of impressions (two maxillary and two mandibular impressions), using putty impression material. They also were instructed to brush their teeth before taking photographs of a frontal view, maxillary occlusal view, and mandibular occlusal view. ![]() Subjects received a limited oral exam to participate in the study. It also got an approval for the Informed Consent Form that was used to obtain consent from study participants. The study was approved by the Institution Review Board (IRB) at Tufts University School of Dental Medicine in Boston, Massachusetts.
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