Al Refai Roa'a, Saker Samah
School of Dentistry, Taibah University, KSA.
Associate Professor, Fixed prosthodontics Department, Faculty of Dentistry, Mansoura University, Egypt.
J Clin Exp Dent. 2018 Jan 1;10(1):e75-e80. doi: 10.4317/jced.53850. eCollection 2018 Jan.
The expected length of service and reasons for fixed dental prostheses (FDPs) replacement are a frequent inquiry by patients while the answers were mainly based on studies reports that was conducted outside the middle east region. This clinical and radiographic survey was constructed to assess and survey clinically and radiographically the reasons of replacement of metal-ceramic fixed dental prostheses, amongst patients reporting at dental school in Taibah University.
Between January and May 2016, 151 patients were recruited for this study. Interview (include questions pertained to the length of service of the prosthesis, the nature of complaint as told by patient in her own words), clinical examination, intra-oral photographs, and periapical radiographs, were done by the researchers. The parameters assessed were secondary caries, open margins, loss of retention, failure of endodontic treatment of the abutment and periodontal diseases.
A total number of 249 failed fixed dental prostheses were evaluated. Of which 180 (39.7%) were single crowns, 159 (35.0%) were retainers and 117 (25.8%) were pontics in 69 fixed partial denture. The most common reason for replacement of fixed restorations was periodontal diseases affecting 92.8% of all types' restorations, followed by defective margin in 90.4% of examined restoration, poor aesthetic in 88% of restorations, while periapical involvement was found in 85.5% of fixed dental prosthesis. The survival rates of fixed prostheses were not predictable, and no association was found between number of years in service and the number of restorations.
The most common reasons for replacing single unit fixed dental prostheses are periodontal diseases and periapical involvement, while defective margins and poor aesthetic mainly associated with multi-unit fixed dental prostheses. Failure, Fixed dental prosthesis, Survival, Replacement.
患者经常询问固定义齿（FDPs）的预期使用时长及更换原因，而相关答案主要基于中东地区以外开展的研究报告。本次临床及影像学调查旨在对塔伊巴大学牙科学院的患者进行临床和影像学评估，以调查金属烤瓷固定义齿的更换原因。
2016年1月至5月期间，招募了151名患者参与本研究。研究人员进行了访谈（包括与义齿使用时长、患者自述的投诉性质相关的问题）、临床检查、口腔内照片拍摄以及根尖片拍摄。评估的参数包括继发龋、边缘开放、固位丧失、基牙根管治疗失败以及牙周疾病。
共评估了249个失败的固定义齿。其中，180个（39.7%）为单冠，159个（35.0%）为固位体，69个固定局部义齿中有117个（25.8%）为桥体。固定修复体更换的最常见原因是牙周疾病，影响了所有类型修复体的92.8%，其次是边缘缺陷，占检查修复体的90.4%，美观性差占修复体的88%，而根尖周病变在85.5%的固定义齿中被发现。固定义齿的生存率无法预测，且使用年限与修复体数量之间未发现关联。
单单位固定义齿更换的最常见原因是牙周疾病和根尖周病变，而边缘缺陷和美观性差主要与多单位固定义齿相关。失败、固定义齿、生存率、更换。
