Raustia A M, Näpänkangas R, Salonen A M
Department of Prosthetic Dentistry and Stomatognathic Physiology, Institute of Dentistry, University of Oulu, Finland.
J Oral Rehabil. 1998 Sep;25(9):677-80. doi: 10.1046/j.1365-2842.1998.00277.x.
Porcelain fused to metal provides better aesthetics in fixed partial dentures than veneers with gold-resin that were used formerly. The aim of our study was to evaluate complications and primary failures of fixed metal ceramic bridge prostheses made by dental students. We studied 61 patients (32 women, 29 men, mean age 49 years, range 28-73 years) treated during years 1990-1993. Data were collected from the patient files. Altogether 82 bridges were made (mean 4.1 units, range 2-6), 221 abutments (mean 2.7, range 2-6) and 136 pontics (mean 1.6, range 1-4). Forty-seven cast cores were used in 29 bridges (mean 0.4 cores, range 1-3) and semiprecious attachments as an extra attachment in two bridges. Seven teeth were extracted due to complication and/or failure during endodontic treatment and root canal perforation during preparation. In two cases the abutment tooth was fractured by removing the old crown. Four unsuccessful bridges were remade and in seven cases the firing of porcelain was renewed. The study concludes that most common failures of fixed metal ceramic bridges made by dental students occur during root canal preparation of abutment teeth.
与以前使用的金树脂贴面相比，烤瓷熔附金属在固定局部义齿中提供了更好的美观效果。我们研究的目的是评估牙科学生制作的固定金属烤瓷桥修复体的并发症和初次失败情况。我们研究了1990年至1993年期间接受治疗的61例患者（32名女性，29名男性，平均年龄49岁，范围28 - 73岁）。数据从患者病历中收集。共制作了82个桥体（平均4.1个单位，范围2 - 6）、221个基牙（平均2.7个，范围2 - 6）和136个桥体（平均1.6个，范围1 - 4）。29个桥体中使用了47个铸造桩核（平均0.4个桩核，范围1 - 3），两个桥体中使用了半贵金属附着体作为额外附着体。7颗牙齿因根管治疗期间的并发症和/或失败以及预备期间的根管穿孔而被拔除。在两例中，基牙因去除旧冠而折断。4个不成功的桥体重做，7例中重新进行了烤瓷烧制。该研究得出结论，牙科学生制作的固定金属烤瓷桥最常见的失败发生在基牙的根管预备过程中。
