[The method of preparation for VMK-crowns].

In a clinical study, follow-ups were made in 259 tangentially prepared VMK crowns. In 49,4 per cent of the cases, inflammatory changes of the marginal gingiva were found, 34.5 per cent discolorations were observed in the same region. Measurements of the marginal thickness of those 68 VMK crowns prepared in a dental laboratory showed that the average marginal thickness of baked crown margins was 1.13mm. Thus, it falls considerably short of the requirements of a satisfactory thickness of metal and ceramics, but largely exceeds the values given for a micro step. Because of these findings, it must be demanded that tangential preparation of metal ceramic replacement with the crown being placed into the gingival sulcus, be discontinued.