Rinke S, Hüls A, Jahn L
Department of Prosthodontics, Dental School, Georg-August-University, Germany.
Int J Prosthodont. 1995 Jul-Aug;8(4):303-10.
In this comparative in vitro study, the marginal accuracy and fracture strength of conventional and copy-milled In-Ceram crowns were examined. Anterior crowns with medians of 32.5 microns for the conventional technique and 38 microns for the copy-milled units had significantly smaller gaps than premolar crowns that had a median marginal gap of 45 microns for both techniques. There was a significant difference in fracture strength only for anterior crowns. The study indicates that copy-milled In-Ceram crown have clinically acceptable margins and fracture strength and reduce laboratory fabrication time.
在这项体外对照研究中，检测了传统制作和复制研磨的全瓷冠的边缘适合性和抗折强度。传统技术制作的前牙冠边缘间隙中位数为32.5微米，复制研磨制作的前牙冠边缘间隙中位数为38微米，这两种前牙冠的边缘间隙均显著小于前磨牙冠，两种技术制作的前磨牙冠边缘间隙中位数均为45微米。仅在前牙冠的抗折强度方面存在显著差异。该研究表明，复制研磨的全瓷冠具有临床可接受的边缘适合性和抗折强度，并且缩短了实验室制作时间。
