Jokstad A, Mjör I A
Department of Anatomy, School of Dentistry, University of Oslo, Norway.
Acta Odontol Scand. 1990 Dec;48(6):379-87. doi: 10.3109/00016359009029069.
The influence of different clinical variables on the marginal degradation of amalgam restorations was studied in a clinical trial of class-II amalgam restorations. Seven Scandinavian dentists using 5 different alloys placed 468 restorations in 210 patients. The marginal degradation was scored on impressions of the restored teeth by using a six-point ordinal rating scale and was transformed to ridit values. After 5 years 126 patients with 296 restorations remained in the trial. Ridit analysis and paired comparison tests utilizing the Bonferroni correction factor at each yearly interval indicated that the extent of degradation of the restoration margins was influenced by the location in the mouth, the position on the tooth, the type of alloy, and the operator. The results demonstrate that features of the cavity preparation and the handling of the material by the operator are more important for the degradation of the restoration margins than other clinical variables.
在一项II类银汞合金修复体的临床试验中，研究了不同临床变量对银汞合金修复体边缘劣化的影响。7名斯堪的纳维亚牙医使用5种不同的合金，为210名患者放置了468个修复体。通过使用六点顺序评分量表对修复牙齿的印模进行边缘劣化评分，并将其转换为ridit值。5年后，126名患者的296个修复体仍在试验中。利用每年间隔的Bonferroni校正因子进行的ridit分析和配对比较试验表明，修复体边缘的劣化程度受口腔位置、牙齿位置、合金类型和操作者的影响。结果表明，窝洞预备的特征和操作者对材料的处理对修复体边缘的劣化比其他临床变量更重要。
