Three Dimensional Finite Element Analysis on the Maxillary Anterior Dentition Fixed with Periodontal Splint Made of High Strength Fiber Bundle The Esthetic Results Clinic Evaluation of Periodontal Pack in Implant-support Prosthetics 上颌前牙高强纤维束带牙周夹板固定后应力的三维有限元研究牙周塞治剂应用于单颗前牙种植术后软组织美学修复的临床研究