Fig. 7

Three-dimensional reconstructions of observed pulp configurations in permanent maxillary premolars. Pulp horns and root canals are labeled with Arabic numerals ranging from 1 to 3 and Roman numerals ranging from I to III, respectively. Reference planes (A to C) indicate the position of selected 2D-images. A common pulp chamber was found in the majority of cases as demonstrated using the 3-D reconstruction of the pulp system of a 10 months-old permanent Triadan 07 (CPC). In a 3 years and 10 months old tooth, occlusal pulp horn 2 is nearly absent. Also, shortening of the root canals occurs in older teeth (CPC*). At the level of permanent Triadan 08 s, a common pulp chamber was observed in all cases as demonstrated in a 7 years and 10 months old tooth. Only a rudimentary occlusal pulp horn 2 could be distinguished in some teeth