Munksgaard E C, Itoh K, Jörgensen K D
J Dent Res. 1985 Feb;64(2):144-6. doi: 10.1177/00220345850640021001.
The effect of stress applied by thermo- and load-cycling to the bond between composite- and bonding-agent-treated dentin was tested. Cylindrical cavities in extracted human teeth, approximately one-half of the margins in dentin, were etched and treated with two bonding agents - Gluma and Clearfil Bond - before being filled with Silux composite. Forty specimens, some provided with cavity floor lining, were cycled several hundred times between 15 degrees and 50 degrees C, either immediately after light-curing or upon 24 hr of water storage. In all cases, microscopic inspection revealed unchanged adaptation at the dentin margins. Teeth with Class 3 and Class 5 cavities, ten of each and with the gingival margins entirely in dentin, were pre-treated and filled as above. The teeth were covered with a dye during loading and unloading in a manner simulating biting and chewing. Inspection of the cavity margins revealed absence of percolation at the dentin margins. It is concluded that effective bonding agents are necessary to prevent contraction gaps in resin-filled cavities where the margins are partly or entirely located in dentin.
测试了热循环和加载循环施加的应力对复合树脂和粘结剂处理的牙本质之间粘结的影响。在拔除的人牙上制备圆柱形洞，洞缘约一半位于牙本质内，酸蚀后用两种粘结剂（Gluma和Clearfil Bond）处理，然后用Silux复合树脂充填。40个标本，部分有洞底衬层，在光固化后或水储存24小时后，于15℃和50℃之间循环数百次。在所有情况下，显微镜检查显示牙本质边缘的适应性未改变。制备10个Ⅲ类洞和10个Ⅴ类洞，龈缘完全位于牙本质内，按上述方法进行预处理和充填。在模拟咬合和咀嚼的加载和卸载过程中，牙齿表面覆盖有染料。检查洞缘发现牙本质边缘无渗漏。结论是，对于边缘部分或全部位于牙本质内的树脂充填洞，需要有效的粘结剂来防止收缩间隙。
