国家自然科学基金面上项目31571508,31371473;重庆市第七批重点学科建设项目牙体牙髓病学,2011年;重庆市卫生局医学科研计划重点项目2011-1-062;重庆市渝北区科技项目[渝北财教201133号]National Natural Science Foundation of China31571508, 31371473;The Seventh Batch of Key Discipline Construction Project of Chongqing—Endodontics and Operative Dentistry2011;Key Project of Medical Research Program of Chongqing Municipal Health Bureau2011-1-062;Science and Technology Project of Yubei District in ChongqingYubei Finance and Education 2011 33