Influence of Contracted Endodontic Access on Root Canal Geometry: An In Vitro Study

By Alovisi M, Pasqualini D, Musso E, Bobbio E, Giuliano C, Mancino D, Scotti N, Berutti E,

Date: 01/2018
Journal: JOE

Summary:

Purpose: Evaluate the influence of contracted endodontic cavities (CECs) on the preservation of the original root canal

anatomy after shaping with nickel-titanium reciprocating instruments. 

Materials/Methods: 

•n: 30 freshly extracted mandibular first permanent molar with fully formed apices 

Inclusion & Exclusion: were stated

CEC group were accessed while preserving pericervical dentin and part of the chamber roof.

Traditional endodontic cavity (TECs) group were drilled following conventional guidelines; wave one gold rotary files were used for both groups.(Fig. 1).

-Micro CT scan was used to assess the inclusion criteria and root canal section and volume was asssesed using CTAn soft ware; surface areas were calculated from the exposed vertical surfaces by pixel differences between adjacent cross sections

Highlights:

-There were no significant difference in the mean curvature of the MB canal between the two groups as well as the volume and surface area of the canal -Straight file access was significantly different between the groups; TEC had less curvature Fig.2.

-The mean pecking motion was significantly less in TEC as well as canal transportation

-The TEC group showed significantly reduced cross-sectional areas at 1 mm from the WL compared with the CEC group due to canal obstruction that lead the file to over instrument to the side opposite to the obstruction  Table 1, Fig.3.

Conclusion:

TEC seems to lead to a better preservation of the original canal anatomy during shaping compared with CEC, particularly at the apical level