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Int Endod J. 2009 Mar;42(3):208-13. doi: 10.1111/j.1365-2591.2008.01502.x.

The effects of canal preparation and filling on the incidence of dentinal defects.

Author information

1
Department of Cariology, Endodontology, Pedodontology, Academic Centre of Dentistry Amsterdam, Amsterdam, The Netherlands. hshemesh@acta.nl

Abstract

AIM:

To evaluate ex vivo the incidence of defects in root dentine before and after root canal preparation and filling.

METHODOLOGY:

Eighty extracted mandibular premolars were divided equally in four groups. Group 1 was left unprepared. All other root canals were prepared using Gates Glidden drills and System GT files up to size-40, 0.06 taper at the working length. Group 2 was not filled while the canals of the other groups were filled with gutta-percha and AH26, either with a master cone and passive insertion of secondary gutta percha points (group 3) or lateral compaction (group 4). Roots were then sectioned horizontally 3, 6, and 9 mm from the apex and observed under a microscope. The presence of dentinal defects (fractures, craze lines or incomplete cracks) was noted and the differences between the groups were analysed with the Fisher's exact test.

RESULTS:

No defects were observed in the roots with unprepared canals. The overall difference between the groups was significant (P < 0.05). Canal preparation alone created significantly more defects than unprepared canals (P < 0.05). The total number of defects after lateral compaction was significantly larger than after noncompaction canal filling.

CONCLUSION:

Root canal preparation and filling of extracted teeth created dentine defects such as fractures, craze lines and incomplete cracks.

[Indexed for MEDLINE]

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