Application of Ce-TZP/Al₂O₃ nanocomposite to the framework of an implant-fixed complete dental prosthesis and a complete denture

Abstract

Patient: A 69-year-old Japanese male visited Nihon University Dental Hospital for refabrica- tion of his mandibular implant-supported complete fixed prosthesis (ISCFPD) and maxillary ^{complete denture, which had been fabricated 15 years previously. In this case, Ce-TZP/Al}2^O3 nanocomposite (Ce-TZP/A) was applied to the framework of the mandibular ISCFPD and maxillary complete denture. Three years after deliver of the framework, no particularly notable biological or prosthetic complications were observed, and a high level of patient satisfaction had been achieved. Discussion: Conventional ISCFPD frameworks were fabricated by casting gold alloys; how- ever, with the recent advancement of CAD/CAM technology, titanium (Ti) or yttria tetrago- nal zirconia polycrystal (Y-TZP) frameworks have become more common. In contrast, the main fabrication method for Ti or Co-Cr frameworks of removable dental prostheses has shifted from the conventional casting method to CAD/CAM fabrication. Ce-TZP/A, which was chosen as the framework material this time, shows higher strength and greater toughness than Y-TZP. However, since it has a low light-transmitting property and exhibits an opaque white color, the range of its application in fixed prostheses, particularly in the esthetic area, is limited. Conclusion: We described a case in which Ce-TZP/A was applied to the frameworks of a mandibular ISCFPD and a maxillary complete denture. No particularly notable biological or prosthetic complications were observed in the mandibular ISCFPD or the maxillary com- plete denture, and a high level of patient satisfaction was achieved. Medium- and long-term observations with a greater number of cases are essential to obtain information concerning various phenomena related to this procedure.