Letzel H, van 't Hof M A, Vrijhoef M M
J Oral Rehabil. 1987 Mar;14(2):133-8. doi: 10.1111/j.1365-2842.1987.tb00702.x.
The influence of the condensation instrument on the behaviour of amalgam restorations was investigated in a clinical study for which in a group of forty-nine patients, 125 Class I or II amalgam restorations were made by each of two operators. The restorations were made in series of five per patient. For each restoration within a series, the amalgam was condensed with a different instrument (hand condensation, Amalgam Condensaire, Speedomatic, Bergendal Vibrator and Electro-mallet). For a period of 2.5 years the restorations were checked at half-year intervals for failures. The marginal integrity of the restorations was assessed half-yearly with a six-point photo rating scale. The discolouration, roughness formation and the marginal integrity of the restorations were assessed clinically with four-point rating scales. The number of failures and the assessments were analysed for the effect of the condensation instrument, the patient and the operator. After 2.5 years, 12% of the restorations had failed, which is too few for the tracing of a condensation instrument and a patient effect. The operator, however, had an influence on the failure percentage. The condensation instrument had no influence on the clinical behaviour of the restorations, however the patient had. The operator only had an influence on the marginal integrity. This suggests that clinically the condensation results depend more on the operator rather than the instrument.
在一项临床研究中，对压实器械对汞合金修复体性能的影响进行了调查。在该研究中，一组49名患者中，两名操作者分别制作了125个I类或II类汞合金修复体。修复体按每位患者5个为一组进行制作。对于每组中的每个修复体，使用不同的器械（手工压实、汞合金压实器、Speedomatic、Bergendal振动器和电动锤）压实汞合金。在2.5年的时间里，每隔半年对修复体的失败情况进行检查。修复体的边缘完整性每半年用六点照片评分量表进行评估。修复体的变色、粗糙度形成和边缘完整性通过四点评分量表进行临床评估。分析了失败数量和评估结果，以研究压实器械、患者和操作者的影响。2.5年后，12%的修复体出现失败，这一数量过少，无法追踪压实器械和患者的影响。然而，操作者对失败率有影响。压实器械对修复体的临床性能没有影响，但患者有影响。操作者仅对边缘完整性有影响。这表明在临床上，压实效果更多地取决于操作者而非器械。
