1. Department of Oral Surgery, National Clinical Research Center for Oral DiseasesShanghai Key Laboratory of Stomatology & Shanghai Research Institute of StomatologyShanghai Ninth People's Hospital, College of StomatologyShanghai Jiao Tong University School of Medicine Shanghai 200011 P. R. China
2. Department of Chemical EngineeringShaanxi Key Laboratory of Energy Chemical Process IntensificationInstitution of Polymer Science in Chemical EngineeringSchool of Chemical Engineering and TechnologyXi'an Jiao Tong University Xi'an 710049 P. R. China
3. State Key Laboratory of Military StomatologyDepartment of Oral and Maxillofacial SurgerySchool of StomatologyThe Fourth Military Medical University Xi'an 710032 Shaanxi P. R. China
4. State Key Laboratory of Military StomatologyNational Clinical Research Center for Oral DiseasesShaanxi International Joint Research Center for Oral DiseasesCenter for Tissue EngineeringSchool of StomatologyFourth Military Medical University Xi'an 710032 Shaanxi P. R. China