Table 3. The distance (mm) from the DB and DL root apices to the outer surface of the buccal cortical bone in mandibular first molars with 2R2C morphology.

	DB root to buccal bone			DL root to buccal bone
	Left	Right	Total	Left	Right	Total
2R2C	5.27 ± 1.73a	5.70 ± 2.01a	5.51 ± 1.90B	11.57 ± 2.07b	12.48 ± 2.38a	12.09 ± 2.29A

Different lowercase superscript letters indicate significant differences between the left and right sides (p < 0.05). Different uppercase superscript letters indicate significant differences between DB and DL roots (p < 0.05).

DB, distobuccal; DL, distolingual; 2R2C, 2 separate distal roots with 1 canal in each root.