In order to investigate the maxillary preprosthetic situation after oral tumor treatment and/or reconstructive surgery, based on the review of case history and the clinical records 47 cases were analyzed after oral tumor treatment and/or reconstruction, including residual maxillary bone, intermaxillary relationships, defection of maxilla and oral situation after radiation therapy. The results showed that the residual maxillary bone was useful for implantation in the front alveolar bone and zygoma area. The maxillary preprosthetic situation after tumor treatment and/or reconstructive surgery was difficult due to maxillary resection, intermaxillary relationships, unsuitable soft and hard tissue transfer and the irradiation. It is suggested that the maxillary preprosthetic situation after oral tumor treatment is getting worse not only due to maxillary resection and/or irradiation, but surprisingly also due to mandibular resection and/or irradiation.
Adult ; Aged ; Alveolar Bone Loss ; surgery ; Alveolar Process ; physiopathology ; Female ; Humans ; Male ; Maxilla ; surgery ; Maxillary Neoplasms ; drug therapy ; radiotherapy ; surgery ; Middle Aged ; Mouth Neoplasms ; drug therapy ; radiotherapy ; surgery ; Oral Surgical Procedures, Preprosthetic ; methods ; Reconstructive Surgical Procedures ; Retrospective Studies

In order to investigate the influence of radiation therapy after the treatment of maxillary implant-supported prostheses, 27 patients received a total of 131 implants in maxilla after oral cancer treatment and/or reconstructive surgery. Among them, 25 received maxillary implant-supported prostheses. The cumulative survival rates of implants and prostheses were evaluated by the product-limit-estimates method according to Kaplan-Meier. The cumulative survival rate of implants and prostheses in irradiated patients was compared with that in non-irradiated patients by statistical Log-rank test. The results showed that 112 implants were observed after implant loading. The implants cumulative survival rate was approximately 65% for overall patients. The cumulative prosthesis successful rate was approximately 88% for all 25 patients. Log-rank test analysis revealed that there was a significant difference in cumulative implants survival rates between non-irradiated and irradiated maxillary bone (P < 0.01). It was concluded that the implants and prostheses in irradiated patients have significantly lower survival rates than in non-irradiated patients.
Aged ; Carcinoma, Squamous Cell ; radiotherapy ; surgery ; Dental Prosthesis, Implant-Supported ; Female ; Graft Survival ; radiation effects ; Humans ; Male ; Mandibular Prosthesis ; Maxilla ; surgery ; Maxillofacial Prosthesis ; Maxillofacial Prosthesis Implantation ; Middle Aged ; Mouth Neoplasms ; radiotherapy ; surgery ; Osseointegration ; Pilot Projects ; Radiation Injuries ; Retrospective Studies ; Survival Rate ; Titanium