Sailer Irena, Fehér Aurel, Filser Frank, Gauckler Ludwig J, Lüthy Heinz, Hämmerle Christoph Hans Franz
Clinic for Fixed and Removable Prosthodontics and Dental Materials, School of Dentistry, University of Zürich, Plattenstr. 11, 8032 Zürich, Switzerland.
Int J Prosthodont. 2007 Jul-Aug;20(4):383-8.
The aim of this prospective clinical cohort study was to determine the success rate of 3- to 5-unit zirconia frameworks for posterior fixed partial dentures (FPDs) after 5 years of clinical observation.
Forty-five patients who needed at least 1 FPD to replace 1 to 3 posterior teeth were included in the study. Fifty-seven 3- to 5-unit FPDs with zirconia frameworks were cemented with 1 of 2 resin cements (Variolink or Panavia TC). The following parameters were evaluated at baseline, after 6 months, and 1 to 5 years after cementation at test (abutments) and control (contralateral) teeth: probing pocket depth, probing attachment level, Plaque Index, bleeding on probing, and tooth vitality. Intraoral radiographs of the FPDs were taken. Statistical analysis was performed using descriptive statistics, Kaplan-Meier survival analysis, and the McNemar test.
Twenty-seven patients with 33 zirconia FPDs were examined after a mean observation period of 53.4 +/- 13 months. Eleven patients with 17 FPDs were lost to follow-up. After the 3-year recall visit, 7 FPDs in 7 patients were replaced because they were not clinically acceptable due to biologic or technical complications. After 5 years of clinical observation, 12 FPDs in 12 patients had to be replaced. One 5-unit FPD fractured as a result of trauma after 38 months. The success rate of the zirconia frameworks was 97.8%; however, the survival rate was 73.9% due to other complications. Secondary caries was found in 21.7% of the FPDs, and chipping of the veneering ceramic in 15.2%. There were no significant differences between the periodontal parameters of the test and control teeth.
Zirconia offers sufficient stability as a framework material for 3- and 4-unit posterior FPDs. The fit of the frameworks and veneering ceramics, however, should be improved.
这项前瞻性临床队列研究的目的是在5年的临床观察后，确定用于后牙固定局部义齿（FPD）的3至5单位氧化锆框架的成功率。
本研究纳入了45名需要至少1个FPD来替换1至3颗后牙的患者。57个带有氧化锆框架的3至5单位FPD用2种树脂粘结剂（Variolink或Panavia TC）中的1种进行粘结。在基线、6个月后以及粘结后1至5年，对试验（基牙）和对照（对侧）牙齿评估以下参数：探诊袋深度、探诊附着水平、菌斑指数、探诊出血和牙齿活力。拍摄FPD的口腔内X光片。使用描述性统计、Kaplan-Meier生存分析和McNemar检验进行统计分析。
在平均观察期为53.4±13个月后，对27名患者的33个氧化锆FPD进行了检查。11名患者的17个FPD失访。在3年的回访后，7名患者的7个FPD因生物学或技术并发症在临床上不可接受而被替换。经过5年的临床观察，12名患者的12个FPD不得不被替换。1个5单位的FPD在38个月后因外伤折断。氧化锆框架的成功率为97.8%；然而，由于其他并发症，生存率为73.9%。21.7%的FPD发现继发龋，15.2%的FPD发现贴面陶瓷崩裂。试验牙和对照牙的牙周参数之间没有显著差异。
氧化锆作为3单位和4单位后牙FPD的框架材料具有足够的稳定性。然而，框架和贴面陶瓷的贴合度应予以改善。
