Table 6 Summary of root dentine thickness results in mandibular first molar

Harris et al. [52]

Whole tooth

(22)

Using the imaging software, the entire mesial root was sectioned from the root apex coronally in 0.5-mm increments for the first 6 mm and in 1.0-mm increments from the 6-mm point to the level of the furcation. The first 6 mm of the distal root was also sectioned in 0.5-mm increments coronally from the apex

DZ in MR = 1.28 mm

DZ in DR ranged from 0.25 mm (at the 0.5-mm level from the apex) To 1.47 mm (at the 5.0-mm level)

toward furcation

Lee et al. [54]

MR

(37)

3D surface models were re-sliced at 0.1-mm intervals perpendicular to the central axis through the whole length of the canal

1.16 (± 0.37)

1.00 (± 0.28)

1.86 (± 0.60)

Thinnest dentine = 0.88 (± 0.26)

Mesially

Distally

Laterally (buccal and lingual)

MB (65%) disto-inside, and (35%) mesially

ML (72%) disto-inside, and (28%) mesially

Keles & Keskin [24]

MR

30 bifid and 30 non-bifid

3D map of dentine thickness was obtained and colour-coded. The DZ was measured at each 1 mm slice from 1 to 7 mm level apical to the furcation

bifid = 1.16 ± 0.16

bifid = 1.08 ± 0.18

non bifid = 1.18 ± 0.15

non bifid = 1.12 ± 0.18

Mesially

Distally

Mesially

Distally

In the mesial direction, it was ranged from 0.49 to 1.88 mm (bifid roots) and from 0.43 to 1.85 mm (non-bifid roots), in the distal direction it varied from 0.32 to 2.14 mm (bifid roots) and from 0.40 to 1.92 mm (non-bifid roots)

De-Deus et al. [11]

MR

(28)

3D models of root surfaces and canals were created and the central axis obtained. DZ was estimated on re-sliced planes made perpendicular to the central axis of each canal at 0.1 mm for the whole length

DZ = 0.86 (± 0.15)

60.7% and 71.4% are located distally in group *I and *II respectively

39.2% and 28.6% are located mesially in group *I and *II respectively