Qvist V, Thylstrup A, Mjör I A
Acta Odontol Scand. 1986 Dec;44(6):343-9. doi: 10.3109/00016358609094344.
A survey has been made of the reasons for placement and replacement of 6052 amalgam restorations in Denmark. In patients more than 16 years of age 48% of all restorations were made because of primary caries, and 52% were replacements of failed restorations. In primary teeth 64% and in permanent teeth of children 83% of the restorations were made because of primary caries. The reasons for replacement of restorations were dependent on dentition, age of the patient, and type of restoration. Secondary caries was the most frequent reason for replacement of failed restorations in permanent teeth, comprising a third of all replacements. Marginal discrepancies and bulk fracture of fillings were the other two major reasons. In primary teeth fracture and loss of fillings were the two major reasons for replacement of amalgam restorations, whereas secondary caries caused less than a quarter of all restorations to be replaced. The age of the restorations replaced ranged from 0 to 38 years, and half of the restorations replaced in permanent teeth of adults were less than 7 years old. A shorter longevity of failed restorations was noted in primary teeth and permanent teeth of children.
一项针对丹麦6052颗汞合金修复体的放置和更换原因进行了调查。在16岁以上的患者中，所有修复体中有48%是因原发龋而进行的，52%是对失败修复体的更换。在乳牙中，64%的修复体是因原发龋而进行的；在儿童恒牙中，这一比例为83%。修复体更换的原因取决于牙列、患者年龄和修复体类型。继发龋是恒牙中失败修复体更换的最常见原因，占所有更换情况的三分之一。充填体边缘不密合和大块折断是另外两个主要原因。在乳牙中，充填体折断和脱落是汞合金修复体更换的两个主要原因，而继发龋导致更换的修复体不到所有修复体的四分之一。被更换修复体的使用年限为0至38年，在成人恒牙中被更换的修复体有一半使用年限不到7年。在乳牙和儿童恒牙中，失败修复体的使用年限较短。
