| Objective: To investigate the effect of different tube voltage,tube current and different numbers of adjacent titanium implants on the assessment of vertical root fracture(VRF)after root canal therapy by cone beam computed tomography(CBCT).Methods: Twenty single rooted mandibular premolars were collected and 10 randomly induced VRF after root canal preparation in vitro.Each tooth canal was placed with a gutta-percha and Each tooth placed in the alveolar socket of the right lower first premolar of the human mandible specimen,and a total of 360 images were acquired using CBCT at different tube voltages(60 k V,80 k V),different tube currents(3 m A,6 m A,and 10 m A),and different adjacent titanium implants(control group,1 adjacent titanium implant,and 2 adjacent titanium implants),Images were interpreted by 5 observers on a 5-point scoring scale for all images,and sensitivity,specificity,and area under the ROC curve(AUC)were compared using 2-way ANOVA and the turkey post hoc test.Results: The specificity of VRF diagnosis after root canal treatment was affected by tube voltage and tube current,which increased to statistical significance when the tube current was certain,tube voltage increased from 60 k V to 80 k V(P < 0.05),and when the tube voltage was certain,tube current increased from 3 to 6 m A or 10 m A,it was statistically significant(P < 0.05),whereas the number of adjacent titanium implants had no influence on diagnosis.Conclusion: An increase in the tube voltage is beneficial for the diagnosis of VRF after root canal treatment,but based on the radiation protection principle,without compromising the diagnosis,while increasing the tube voltage,try to select a lower tube current;Different numbers of adjacent titanium implants did not affect the evaluation of VRF after root canal treatment by CBCT. |
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