Results: The measurements in first molars were as follows (mean, mm): cusp tip to pulp chamber floor 8.00±0.86 mm (maxillary), 7.69±0.80 mm (mandibular); central fossa to furcation 2.62±0.66 mm (maxillary), 2.24±0.51 mm (mandibular); pulp chamber ceiling to furcation 4.10±0.77 mm (maxillary), 3.31±0.58 mm (mandibular); pulp chamber height 1.49±0.68 mm (maxillary), 1.07±0.47 mm (mandibular).