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Influence of instrument taper on the fracture susceptibility of endodontically treated maxillary premolars [Turk Endod J]
Turk Endod J. Ahead of Print: TEJ-52824 | DOI: 10.14744/TEJ.2022.52824

Influence of instrument taper on the fracture susceptibility of endodontically treated maxillary premolars

Devika R Krishnan1, Prabath Singh V P2, Nithin Mathew1
1Consultant Endodontist, Cochin, Kerala
2Department of Conservative Dentistry & Endodontics, Amrita School of Dentistry, Cochin, Kerala, India

Purpose: To determine residual dentin thickness, fracture susceptibility, and mode of fracture of endodontically treated bifurcated maxillary premolars with different tapered file systems.
Methods: Fifty bifurcated maxillary first premolars were randomly divided into 5 groups of 10 specimens each- intact control teeth, 30-2% K file, 30-4% K3 system, 30-6% Mtwo system and 30-9% Protaper Universal system. Apical preparation was done up to ISO 30. Assessment of Residual Radicular Dentin Thickness was done using measurements from cone-beam computed tomography scans. The fracture susceptibility and mode of fracture were evaluated by subjecting to static loading in universal testing machine. Data were analyzed using ANOVA, Tukey's HSD for multiple comparisons and Pearson Correlation with significance level set at p< 0.05.
Results: The mean of difference in RRDT at 3mm and 6mm and the mean of maximum fracture loads were greatest for group 5: 30-9% Protaper Universal system, while Group 2: 30-2% K file exhibiting the least values. On statistical analysis, there was statistically significant difference in vertical and oblique loading between the experimental groups (p< 0.05).
Conclusion: On scrutinizing the results, it is succinct that increase in taper decreases the amount of residual dentin thickness, consequently increasing the fracture susceptibility of maxillary premolars.

Keywords: cone-beam computed tomography, fracture susceptibility, instrument taper, residual radicular dentin thickness, vertical root fractures



Corresponding Author: Devika R Krishnan, India
Manuscript Language: English
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