A Study on Phase Contrast Enhanced Micro CT Imaging of Gaps around Root Canal Cavity Restorations
Objective This study aims to evaluate the phase contrast(PC)of synchronous accelerators μ The feasibility of CT displaying dental gaps and distinguishing between dental,restorative,and pulp materials at the dental restoration interface.Methods Prepare standardized cavities on maxillary molars and simulate root canal treatment:(1)Rinse with physiological saline;(2)NaOCl+17％EDTA rinsing;(3)Same as group 2,then use calcium hydroxide;(4)Same as group 2,then use root canal sealant.Clean and repair the entrance hole using acid wash adhesive and multi-layer composite material technology.The sample underwent thermal cycling(1000 cycles,5-55℃).Performing synchronous accelerator based μ CT imaging to obtain the absorption and PC of the sample before and after 50％AgN3 immersion μ CT images.Connect PC-μ CT images and absorption μ Compare CT images with conventional optical microscope images.Results PC of unstained specimens μ CT can best display the gap and distinction between repair materials and dental pulp materials,thereby contaminating the surface of the cavity.PC μ The CT results showed that AgNO3 staining led to an overestimation of gap size,which was due to the anterograde and retrograde infiltration of AgNO3 into the pulp tubules,while the estimation of larger gaps was due to insufficient infiltration of AgNO3.Conclusion Synchronous Accelerator PC μ CT imaging can better display the gaps and material differences at the interface of dental restorations.Silver nitrate staining μ CT imaging shows a certain degree of overestimation and underestimation.The future research goal should be to combine PC from unstained specimens μ CT imaging to verify results obtained using other methods.
Phase Contrast Enhanced Micro CTInterstitial Space between TeethDental Pulp Materials
万方数据
维普
