Raigrodski Ariel J, Chiche Gerard J, Potiket Narong, Hochstedler J L, Mohamed Shawky E, Billiot Susan, Mercante Donald E
Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, USA.
J Prosthet Dent. 2006 Oct;96(4):237-44. doi: 10.1016/j.prosdent.2006.08.010.
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.
The aim of this pilot clinical study was to assess the efficacy of zirconia-based posterior 3-unit FPDPs.
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.
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.
Zirconia-based posterior 3-unit FPDPs performed well after short-term service.
尽管用于固定局部义齿修复体（FPDPs）的氧化锆基修复体已可供使用，但评估其使用寿命及相关并发症的临床研究尚未发表。
本初步临床研究的目的是评估氧化锆基后牙3单位固定局部义齿修复体的疗效。
将20个3单位后牙固定局部义齿修复体（Lava）植入16名缺失第二前磨牙或第一磨牙且符合特定纳入和排除标准并签署知情同意书的受试者体内。所有牙齿均采用标准化方式预备：咬合面降低1.5至2毫米；轴面降低1至1.5毫米；在健康牙体结构的唇面龈下0.5毫米处及舌面龈上制作一个1.0毫米、360度的圆形肩台；以及倒圆内部线角。采用乙烯基聚硅氧烷（Express）印模材料制取印模。使用计算机辅助设计/计算机辅助制造技术制作支架，固位体厚度为0.6毫米，最小连接体表面积为9平方毫米。修复体用树脂改性玻璃离子水门汀（Rely X luting）黏固。在2周以及6、12、18、24和36个月后安排复诊。使用改良的Ryge标准随时间评估临床抗折性、边缘变色、边缘适合性、X线片显示的邻面继发龋和根尖病变。计算这些变量在基线数据以及复诊数据中的概率分布情况。
平均随访时间为31.2个月。15个修复体在所有测量参数中均评为A级。在5个修复体中检测到饰面瓷轻微崩裂，这些修复体临床抗折性评为B级，所有其他评估参数评为A级。1个修复体在36个月时边缘完整性评为B级。
氧化锆基后牙3单位固定局部义齿修复体短期使用后表现良好。
