Pashley E L, Comer R W, Parry E E, Pashley D H
Medical College of Georgia, School of Dentistry, Augusta 30912-1129.
Oper Dent. 1991 May-Jun;16(3):82-9.
The retentive strength and sealing properties of amalgam buildups were compared in vitro in three groups of specimens. All teeth were prepared with flat, nonretentive surfaces. In the first group, the amalgam buildups were retained by four self-threading Minim pins. In the second group, retention was provided by a circumferential slot prepared in the dentin just inside the DEJ. The third group utilized an adhesive resin for retention. Dentin permeability was measured as a hydraulic conductance before and after placement of the amalgam buildups and before and after thermocycling. All methods of retention sealed dentin very well even in the absence of cavity varnish. The 90 degree retentive strength was: pins, 10.3 +/- 0.9 MPa; slots, 4.1 +/- 0.5 MPa; resin, 3.1 +/- 0.8 MPa (mean +/- SEM).
在三组样本中对银汞合金堆积体的固位强度和封闭性能进行了体外比较。所有牙齿均制备成平坦、无固位的表面。第一组中，银汞合金堆积体由四个自攻型微型桩固位。第二组中，通过在牙本质中紧靠牙本质-釉质界内侧制备的环形槽提供固位。第三组使用粘结树脂进行固位。在银汞合金堆积体放置前后以及热循环前后，测量牙本质渗透性作为水力传导率。即使不使用洞漆，所有固位方法对牙本质的封闭效果都非常好。90度固位强度为：桩，10.3±0.9兆帕；槽，4.1±0.5兆帕；树脂，3.1±0.8兆帕（平均值±标准误）。
