Setz J, Diehl J
Department of Prosthetic Dentistry, School of Dentistry, University of Tuebingen, Germany.
J Prosthet Dent. 1994 May;71(5):442-6. doi: 10.1016/0022-3913(94)90180-5.
Sintered metals have been developed recently for the construction of metal ceramic crowns (Degusint U). An unbalanced, randomized double-blind study was conducted to compare the gingival response to artificial crowns with sintered noble metal margins and cast noble metal margins (Degudent U) by measuring the sulcus-fluid-flow rate (SFFR) in highly motivated patients. In a prior study marginal opening of 20 microns were recorded for cast metal crowns, whereas two sintered metal crowns had marginal openings of 40 microns. Three metal ceramic crowns (Renaissance, Degusint U, and Degudent U for the copings and VMK 68 porcelain) with subgingival margins were prepared and fabricated for 12 intact natural teeth. The SFFR was measured for teeth with artificial crowns and adjacent natural teeth after provisional insertion of each crown. Significantly elevated SFFRs were recorded for all artificial crowns compared with the adjacent natural teeth, but there were no variations recorded for the different types of crown margins.
烧结金属最近已被开发用于制作金属烤瓷冠（Degusint U）。通过测量积极性较高患者的龈沟液流速（SFFR），进行了一项非均衡、随机双盲研究，以比较人工冠采用烧结贵金属边缘与铸造贵金属边缘（Degudent U）时的牙龈反应。在之前的一项研究中，铸造金属冠的边缘开口记录为20微米，而两个烧结金属冠的边缘开口为40微米。为12颗完整的天然牙制备并制作了三个带有龈下边缘的金属烤瓷冠（用于基底冠的Renaissance、Degusint U和Degudent U以及VMK 68瓷）。在临时戴入每个冠后，测量了戴有人造冠的牙齿和相邻天然牙的SFFR。与相邻天然牙相比，所有人工冠的SFFR均显著升高，但不同类型的冠边缘未记录到差异。
