Altogether 155 crowned teeth--incisors, canines, premolars and molars in both jaws--have been studied by means of radiographs regarding tooth length before and after crown therapy. The results show that the correlation in tooth length is good. The mean differences, however, vary between -0.52 mm for the upper molars and 0.44 mm for the upper incisors. The best correlation in tooth length was found for the upper premolars and the lower incisors.
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