A number of improvements are described for the preparation of resin se
ctions of undecalcified bone embedded in polymethyl methacrylate. Base
d on a modified resin mix, the modifications, which include a speciall
y designed block clamp, have resulted in a simplified and quicker proc
edure with improved section quality. The method has been used routinel
y for investigating approximately 10 000 cases of metabolic bone disea
se for diagnostic purposes.