摘要
目的本研究旨在评价同步加速器相位对比(phase-contrast,PC)μCT在牙体修复界面显示牙体间隙和区分牙体、修复体和牙髓材料的可行性。方法在上颌磨牙上制备标准化窝洞,模拟根管治疗:(1)生理盐水冲洗;(2)NaOCl+17%EDTA冲洗;(3)同第2组,然后用氢氧化钙;(4)同第2组,再用根管封闭剂。使用酸洗粘结剂和复合材料多层技术清洁和修复进入洞。样品进行了热循环(1000次循环,5-55℃)。进行基于同步加速器的μCT成像,获得样品在50%AgN3浸泡前后的吸收和PCμCT图像。将PC-μCT图像与吸收μCT图像和常规光学显微镜图像进行比较。结果未染色标本的PCμCT能够最好地显示修复材料和牙髓材料的间隙和区分,从而污染洞表面。PCμCT结果显示,AgNO3染色导致了对间隙大小的高估,这是由于AgNO3顺行和逆行浸润到牙髓小管中,而对间隙较大的估计则是由于AgNO3渗透不足。结论同步加速器PCμCT成像可以更好地显示牙修复体界面的间隙和材料的差异。硝酸银染色的μCT成像显示出一定程度的高估和低估。未来的研究目标应该是结合未染色标本的PCμCT成像,以验证用其他方法获得的结果。
Objective This study aims to evaluate the phase contrast(PC)of synchronous acceleratorsμThe feasibility of CT displaying dental gaps and distinguishing between dental,restorative,and pulp materials at the dental restoration interface.MethodsPrepare 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 basedμCT imaging to obtain the absorption and PC of the sample before and after 50%AgN3 immersionμCT images.Connect PC-μCT images and absorptionμCompare CT images with conventional optical microscope images.ResultsPC of unstained specimensμCT can best display the gap and distinction between repair materials and dental pulp materials,thereby contaminating the surface of the cavity.PCμThe 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.ConclusionSynchronous Accelerator PCμCT imaging can better display the gaps and material differences at the interface of dental restorations.Silver nitrate stainingμCT imaging shows a certain degree of overestimation and underestimation.The future research goal should be to combine PC from unstained specimensμCT imaging to verify results obtained using other methods.
作者
白阳
李明
姜文玲
BAI Yang;LI Ming;JIANG Wen-ling(Department of Oral and Maxillofacial Surgery,First Affiliated Hospital of Harbin Medical University,Harbin 150001,Heilongjiang Province,China;Department of Eye Ear Nose and Throat,First Branch of Beidahuang Group General Hospital,Harbin 150036,Heilongjiang Province,China;Department of Stomatology,Qunli Branch,First Affiliated Hospital of Harbin Medical University,Harbin 150001,Heilongjiang Province,China)
出处
《中国CT和MRI杂志》
2024年第12期37-39,共3页
Chinese Journal of CT and MRI
基金
黑龙江省重点研发计划指导类项目(GZ20210457)。
关键词
相位对比增强显微CT
牙体间隙
牙髓材料
Phase Contrast Enhanced Micro CT
Interstitial Spacebetween Teeth
Dental Pulp Materials
