IADR Abstract Archives
Analysis of Post-Instrumentation Morphology in Simulated Root Canals in Resin Blocks.
Objectives: Compare the influence of different Nickel-Titanium alloys on the instrumented surface in simulated root canals in acrylic resin blocks.
Methods: Thirty endodontic training blocks (Endo Training Blocks® Dentsply Sirona) #15/.02 were selected with controlled length, diameter, angle and radius of curvature. The sample was randomly divided into 6 groups of five blocks each: Conventional Group: Conventional NiTi alloy instruments. M-Wire Group: NiTi alloy instruments with heat treatment. Gold Group: NiTi alloy instruments with gold oxide. Blue Group: NiTi alloy instruments with blue oxide. Group CM: NiTi alloy instruments with controlled memory (CM). MaxWire Group: NiTi alloy instruments with Martensitic-Austenitic phase transformation. Subsequently, the root canals were instrumented according to the manufacturer's instructions for each system, then the positioning and distance for capturing images of each block was standardized, and each sample was photographed. An original block (without preparation) was used as control. The images were processed in software (Image Pro Plus, Media Cybernetics, Rockville, USA) to compare the changes produced. Using a template, 6 measurement sections were determined along the root canal. The data obtained were tabulated and statistically analyzed, setting a significance limit of p<0.05. Analysis of variance (ANOVA) of repeated measures of two factors, one within subjects (section) and another between subjects (group) was used. To verify the interaction between the sections, the Bonferroni test was applied. Multiple contrast between groups was verified with Scheffé's post-hoc test.
Results: The differences between sections were statistically very significant (p=1.3E-25) and Bonferroni test p<0.05 in all cases. The interaction between the section and group factors was also significant (p=1.7E-09). In the intersubject contrast, the differences between groups were significant (p=7.4E-08), but some similarities were also observed between groups of alloys. The NiTi alloy group with gold oxide registered the highest amount of resin removed all the way through the canal.
Conclusions: In conclusion and according to the results of the present study, some instruments showed an excessive surface pattern of removed resin and should be avoided in certain root anatomies.
Methods: Thirty endodontic training blocks (Endo Training Blocks® Dentsply Sirona) #15/.02 were selected with controlled length, diameter, angle and radius of curvature. The sample was randomly divided into 6 groups of five blocks each: Conventional Group: Conventional NiTi alloy instruments. M-Wire Group: NiTi alloy instruments with heat treatment. Gold Group: NiTi alloy instruments with gold oxide. Blue Group: NiTi alloy instruments with blue oxide. Group CM: NiTi alloy instruments with controlled memory (CM). MaxWire Group: NiTi alloy instruments with Martensitic-Austenitic phase transformation. Subsequently, the root canals were instrumented according to the manufacturer's instructions for each system, then the positioning and distance for capturing images of each block was standardized, and each sample was photographed. An original block (without preparation) was used as control. The images were processed in software (Image Pro Plus, Media Cybernetics, Rockville, USA) to compare the changes produced. Using a template, 6 measurement sections were determined along the root canal. The data obtained were tabulated and statistically analyzed, setting a significance limit of p<0.05. Analysis of variance (ANOVA) of repeated measures of two factors, one within subjects (section) and another between subjects (group) was used. To verify the interaction between the sections, the Bonferroni test was applied. Multiple contrast between groups was verified with Scheffé's post-hoc test.
Results: The differences between sections were statistically very significant (p=1.3E-25) and Bonferroni test p<0.05 in all cases. The interaction between the section and group factors was also significant (p=1.7E-09). In the intersubject contrast, the differences between groups were significant (p=7.4E-08), but some similarities were also observed between groups of alloys. The NiTi alloy group with gold oxide registered the highest amount of resin removed all the way through the canal.
Conclusions: In conclusion and according to the results of the present study, some instruments showed an excessive surface pattern of removed resin and should be avoided in certain root anatomies.