This study investigated the positional relation of the commissure line of the mouth to the maxillary first molars. Thirty-five volunteers, 20 to 40 years old, with normal natural dentitions were recruited. Maxillary casts with marks locating the commissure were digitally scanned to measure the vertical distance from the tip to the base of the mesiofacial cusp (CO) and from the tip to the mark (CM). There was no significant difference (t test; P > .05) between the CO (1.61 ± 0.41 mm) and CM (1.14 ± 0.68 mm). The mean distance of the commissure mark from the occlusal plane was 0.78 mm.

The purpose of this study was to investigate the effectiveness of incorporating
cooperative-online synchronous learning (CSCMC) as a supplement material carried out to
enhance reading performance. Author-Plus and a website were used to be the treatment of the
study. It was hypothesized that there would be no significant difference between the mean
scores of the students who completed the experiment and those who did not. The study also
involved an attitude questionnaire to detect the experimental group’s attitude towards