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首页> 外文期刊>The Journal of Prosthetic Dentistry >The efficacy of posterior three-unit zirconium-oxide-based ceramic fixed partial dental prostheses: a prospective clinical pilot study.
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The efficacy of posterior three-unit zirconium-oxide-based ceramic fixed partial dental prostheses: a prospective clinical pilot study.

机译：后三单元氧化锆基陶瓷固定局部假牙的功效：一项前瞻性临床试验研究。

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STATEMENT OF PROBLEM: Although zirconium-oxide-based restorations for fixed partial denture prostheses (FPDPs) are available for use, clinical studies evaluating their longevity and related complications have not been published. PURPOSE: The aim of this pilot clinical study was to assess the efficacy of zirconia-based posterior 3-unit FPDPs. MATERIAL AND METHODS: Twenty 3-unit posterior FPDPs (Lava) were placed in 16 subjects who were missing a second premolar or a first molar, met specific inclusion and exclusion criteria, and provided informed consent. All teeth were prepared in a standardized manner: occlusal reduction of 1.5 to 2 mm; axial reduction of 1 to 1.5 mm; a 1.0-mm, 360-degree rounded shoulder placed 0.5 mm subgingivally on the facial aspect and supragingivally on the lingual aspect on sound tooth structure; and rounded internal line angles. Impressions were made with vinyl polysiloxane (Express) impression material. Frameworks were fabricated using a computer-aided design/computer-assisted manufacturing technique with a retainer thickness of 0.6 mm, and a minimal connector surface area of 9 mm(2). Restorations were luted with resin-modified glass-ionomer cement (Rely X luting). Recall appointments were made after 2 weeks and 6, 12, 18, 24, and 36 months. Clinical fracture resistance, marginal discoloration, marginal adaptation, radiographic proximal recurrent decay, and periapical pathoses were assessed over time using modified Ryge criteria. The probability distributions of these variables were calculated for the baseline data as well as for recall data. RESULTS: Mean follow-up was 31.2 months. Fifteen restorations were rated Alpha in all measured parameters. Minor chipping of veneering porcelain was detected in 5 restorations rated Bravo for clinical fracture resistance and Alpha for all other assessed parameters. One restoration was rated Bravo in terms of marginal integrity at 36 months. CONCLUSIONS: Zirconia-based posterior 3-unit FPDPs performed well after short-term service.
机译：问题陈述：尽管可以使用基于氧化锆的固定局部义齿修复物（FPDP）的修复体，但尚未评估其寿命和相关并发症的临床研究。目的：这项初步临床研究的目的是评估基于氧化锆的后3单元FPDP的疗效。材料和方法：将二十个3个单元的后部FPDP（Lava）放置在16名受试者中，他们缺少第二颗前磨牙或第一颗磨牙，符合特定的纳入和排除标准，并提供了知情同意。所有牙齿均以标准化方式制备：咬合缩小1.5至2 mm;轴向减小1至1.5毫米; 1.0毫米，360度圆角的肩膀在齿形上位于齿龈下方0.5毫米处，而在舌上则位于舌上龈上;以及圆角内部线角。用乙烯基聚硅氧烷（Express）印模材料进行印模。框架是使用计算机辅助设计/计算机辅助制造技术制造的，其固定器厚度为0.6毫米，最小连接器表面积为9毫米（2）。用树脂改性的玻璃离聚物胶粘剂进行修复（Rely X luting）。召回约会是在2周和6、12、18、24和36个月后进行的。使用改良的Ryge标准随时间评估临床骨折抵抗力，边缘变色，边缘适应，影像学近端复发性衰变和根尖周病。这些变量的概率分布是针对基准数据以及召回数据计算的。结果：平均随访时间为31.2个月。在所有测量参数中，有15个修复体的等级为Alpha。在5个修复体中检测出饰面瓷的小碎屑，这些修复体的临床抵抗力等级为Bravo，所有其他评估参数的等级为Alpha。一项修复在36个月的边缘完整性方面被评为Bravo。结论：基于氧化锆的后3单元FPDP在短期服务后表现良好。

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