Department of Prosthodontics, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany.
Int J Prosthodont. 2009 Nov-Dec;22(6):597-603.
The aim of this prospective clinical trial was to evaluate the reliability of three- and four-unit posterior fixed partial dentures (FPDs) with zirconia frameworks after 3 years of clinical function.
Thirty patients, each needing a posterior FPD to restore one or two missing teeth, were included in the study. Preparation guidelines were: occlusal reduction of 1.5 to 2 mm, axial reduction of 1.5 mm, and circumferential chamfer preparation placed 0.5 mm subgingivally. Frameworks were fabricated using a computer-aided design/computer-assisted manufacture technique. All FPDs were cemented with glass-ionomer cement. At baseline and 12, 24, and 36 months after cementation, survival and success of the zirconia framework and the ceramic veneer were evaluated. To analyze the effect of placement of an all-ceramic restoration on the gingival tissue, Gingival Index, Plaque Index, sulcus bleeding index, and pocket depth at abutment (test) and contralateral analogous teeth (control) were assessed. Data were analyzed by descriptive statistics, the Wilcoxon test, and the McNemar test.
Of the 30 initial subjects, 27 patients with 27 zirconia FPDs were examined after a mean testing period of 34.2 months. All FPDs were still in use and unfractured, resulting in a 100% survival rate for the frameworks. One FPD exhibited a major chip after 36 months. The cumulative success rate was 96.3%. No significant differences between the periodontal parameters of the test and control teeth were observed. The Plaque Index revealed significantly higher scores for mesial and distal control teeth at baseline and after 12 and 24 months for distal control teeth.
Posterior zirconia-based three- and four-unit FPDs present a reliable treatment modality after medium-term clinical use.
本前瞻性临床试验旨在评估经过 3 年临床使用后，具有氧化锆基底的三单位和四单位后固定局部义齿（FPD）的可靠性。
本研究纳入了 30 名患者，每位患者均需要在后牙区制作 FPD 以修复 1 至 2 颗缺失牙。预备指导原则为：牙合面磨除 1.5-2mm，轴面磨除 1.5mm，以及龈下 0.5mm 处制备 0.5mm 宽的肩台。采用计算机辅助设计/计算机辅助制造技术制作基底。所有 FPD 均使用玻璃离子水门汀黏固。在黏固后 12、24 和 36 个月时，对氧化锆基底和陶瓷贴面的存活率和成功率进行评估。为分析全瓷修复体的放置对牙龈组织的影响，评估了龈指数、菌斑指数、龈沟出血指数和基牙（测试牙）和对侧同名牙（对照牙）的牙周袋深度。采用描述性统计、Wilcoxon 检验和 McNemar 检验对数据进行分析。
在最初的 30 名受试者中，有 27 名患者（27 个氧化锆 FPD）在平均 34.2 个月的测试期后接受了检查。所有 FPD 仍在使用且未发生断裂，基底的存活率为 100%。1 个 FPD 在 36 个月后出现了较大的崩瓷。累积成功率为 96.3%。测试牙和对照牙的牙周参数无显著差异。菌斑指数显示，在基线时以及黏固后 12 个月和 24 个月时，近中及远中对照牙的得分均显著升高，而远中对照牙的得分在 24 个月时显著升高。
经过中期临床使用后，氧化锆基的三单位和四单位后固定局部义齿是一种可靠的治疗方式。
