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Alterations of the Danger Zone after Preparation of Curved Root Canals Using WaveOne with Reverse Rotation or Reciprocation Movements.

Shantiaee Y, Dianat O, Paymanpour P, Nahvi G, Ketabi MA, Kolahi Ahari G - Iran Endod J (2015)

Bottom Line: Data was analyzed using the repeated measures ANOVA test.There was no statistically significant difference between two experimental groups in terms of remaining dentin thickness at 2 and 4 mm levels below the highest point of the furcation (P>0.05).The efficacy of WaveOne instrument on changes of the dentin thickness in the DZ was not affected by different file movements.

View Article: PubMed Central - PubMed

Affiliation: Iranian Center for Endodontic Research, Research Institute of Dental sciences, Department of Endodontics, Dental School , Shahid Beheshti University of Medical Sciences, Tehran, Iran ;

ABSTRACT

Introduction: The aim of this study was to compare the changes that occur in the danger zone (DZ) after preparation of curved mesiobuccal (MB) canals of mandibular first molars with WaveOne instruments in two different movements [reciprocation (RCP) and counter-clockwise rotation (CCWR)] by means of cone-beam computed tomography (CBCT).

Methods and materials: MB canals of 30 mandibular molars were randomly divided into 2 groups (n=15); WaveOne/RCP and WaveOne/CCWR. Pre- and post-instrumentation CBCT images were assessed for changes in the dentin thickness in DZ (2 and 4 mm below the highest point of the root furcation) in both groups. Data was analyzed using the repeated measures ANOVA test.

Results: There was no statistically significant difference between two experimental groups in terms of remaining dentin thickness at 2 and 4 mm levels below the highest point of the furcation (P>0.05).

Conclusion: The efficacy of WaveOne instrument on changes of the dentin thickness in the DZ was not affected by different file movements.

No MeSH data available.


Dentin thickness measured in the danger zone area in CBCT images obtained before (left) and after (right) preparation
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Figure 1: Dentin thickness measured in the danger zone area in CBCT images obtained before (left) and after (right) preparation

Mentions: The specimens including test and control samples were then replaced at the same position on the jig and then were scanned under the similar conditions. Assessment of scans was done by the recommended software, NTT Viewer version 3.00 (NTT Software Corporation, Yokohama, Japan). MPR Screen was utilized for measuring. The Zoom tool was applied to allow a better visualization of the teeth. The vertical and horizontal bars were used as reference for alignment of the images. The Distance tool (on coronal section) was employed to determine the measure from the highest point of the furcation area up to 2- and 4-mm distances apically. Then the horizontal bar was adjusted 2 and 4 mm from furcation area, generating an image in the axial section. Thickness of the canal wall was measured within the axial plane at two specified locations. To evaluate the alterations in dentin thickness, the shortest distance from the inner canal wall to the corresponding outer wall of the canal (mesial and distal) in uninstrumented and instrumented canals were measured in both safe zone and DZ of the aforementioned sections (Figure 1).


Alterations of the Danger Zone after Preparation of Curved Root Canals Using WaveOne with Reverse Rotation or Reciprocation Movements.

Shantiaee Y, Dianat O, Paymanpour P, Nahvi G, Ketabi MA, Kolahi Ahari G - Iran Endod J (2015)

Dentin thickness measured in the danger zone area in CBCT images obtained before (left) and after (right) preparation
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4509121&req=5

Figure 1: Dentin thickness measured in the danger zone area in CBCT images obtained before (left) and after (right) preparation
Mentions: The specimens including test and control samples were then replaced at the same position on the jig and then were scanned under the similar conditions. Assessment of scans was done by the recommended software, NTT Viewer version 3.00 (NTT Software Corporation, Yokohama, Japan). MPR Screen was utilized for measuring. The Zoom tool was applied to allow a better visualization of the teeth. The vertical and horizontal bars were used as reference for alignment of the images. The Distance tool (on coronal section) was employed to determine the measure from the highest point of the furcation area up to 2- and 4-mm distances apically. Then the horizontal bar was adjusted 2 and 4 mm from furcation area, generating an image in the axial section. Thickness of the canal wall was measured within the axial plane at two specified locations. To evaluate the alterations in dentin thickness, the shortest distance from the inner canal wall to the corresponding outer wall of the canal (mesial and distal) in uninstrumented and instrumented canals were measured in both safe zone and DZ of the aforementioned sections (Figure 1).

Bottom Line: Data was analyzed using the repeated measures ANOVA test.There was no statistically significant difference between two experimental groups in terms of remaining dentin thickness at 2 and 4 mm levels below the highest point of the furcation (P>0.05).The efficacy of WaveOne instrument on changes of the dentin thickness in the DZ was not affected by different file movements.

View Article: PubMed Central - PubMed

Affiliation: Iranian Center for Endodontic Research, Research Institute of Dental sciences, Department of Endodontics, Dental School , Shahid Beheshti University of Medical Sciences, Tehran, Iran ;

ABSTRACT

Introduction: The aim of this study was to compare the changes that occur in the danger zone (DZ) after preparation of curved mesiobuccal (MB) canals of mandibular first molars with WaveOne instruments in two different movements [reciprocation (RCP) and counter-clockwise rotation (CCWR)] by means of cone-beam computed tomography (CBCT).

Methods and materials: MB canals of 30 mandibular molars were randomly divided into 2 groups (n=15); WaveOne/RCP and WaveOne/CCWR. Pre- and post-instrumentation CBCT images were assessed for changes in the dentin thickness in DZ (2 and 4 mm below the highest point of the root furcation) in both groups. Data was analyzed using the repeated measures ANOVA test.

Results: There was no statistically significant difference between two experimental groups in terms of remaining dentin thickness at 2 and 4 mm levels below the highest point of the furcation (P>0.05).

Conclusion: The efficacy of WaveOne instrument on changes of the dentin thickness in the DZ was not affected by different file movements.

No MeSH data available.