Kurosaki N, Kubota M, Yamamoto Y, Fusayama T
Quintessence Int. 1990 Feb;21(2):87-92.
The most conservative cavity preparation, which takes full advantage of chemically adhesive composite resin, involves removal of only the infected outer carious dentin that is stainable by the caries detector. This preparation exposes in the cavity floor either the turbid layer at the top of the inner carious dentin or the underlying transparent layer. Examination by scanning electron microscope revealed that etching the cavity floor demineralized the intertubular dentinal surface slightly and produced tapered, cylindrical holes or ring-shaped holes at the dentinal tubule apertures of the turbid or transparent layer, respectively. The holes were blind with solid floors of intratubular crystal deposits of the transparent layer, suggesting that etching increases permeability little. Placement of the adhesive resin on the etched cavity floors produced a resin-impregnated dentinal layer and tapered, cylindrical or tubular-shaped resin tags, which apparently improved the bond and tubule aperture seal.
最保守的窝洞预备，即充分利用化学粘结性复合树脂的方法，仅去除能用龋病探测器染色的已感染外层龋坏牙本质。这种预备在窝洞底部暴露的要么是内层龋坏牙本质顶部的浑浊层，要么是其下方的透明层。扫描电子显微镜检查显示，蚀刻窝洞底部会使管间牙本质表面轻微脱矿，并分别在浑浊层或透明层的牙本质小管开口处产生锥形、圆柱形孔或环形孔。这些孔是盲端，透明层的管内晶体沉积物形成坚实的底部，这表明蚀刻对渗透性的增加很小。在蚀刻后的窝洞底部放置粘结树脂会形成树脂浸渍的牙本质层以及锥形、圆柱形或管状的树脂突，这显然改善了粘结效果并封闭了小管开口。
