Freesmeyer W B
Dtsch Zahnarztl Z. 1980 May;35(5):532-6.
Six-part bridge frames constructed from the same were examined with microscopic measuring techniques to determine the influence of the fusing technique on porcelain. In the course of this study, it was established that alterations in the dimensions of the bridge frame develop with the oxide bake as well as also the dentine and glaze bakes, while only slight alterations were observed with the basic bake. The oxide bake leads to a general reduction in lumen size of the abutment crown and a decrease in the flange angle; the dentine and glaze bakes, to a deformation of the abutment crowns, mesiodistal decrease in lumen size and buccolingual widening, as well as further reduction of the flange angle. The alterations ranged between 10 micrometer and -63 micrometer and therefore are responsible for the inaccuracy of fit of porcelain-fused-to-metal bridges.
用显微镜测量技术检查了由相同材料制成的六部分桥体框架，以确定熔合技术对瓷的影响。在这项研究过程中发现，桥体框架尺寸的变化在氧化物焙烧以及牙本质和釉质焙烧时都会出现，而在基础焙烧时仅观察到轻微变化。氧化物焙烧导致基牙冠管腔尺寸普遍减小和凸缘角度减小；牙本质和釉质焙烧则导致基牙冠变形、近远中管腔尺寸减小和颊舌向增宽，以及凸缘角度进一步减小。这些变化范围在10微米至 -63微米之间，因此是造成烤瓷熔附金属桥贴合不准确的原因。
