Theoretical inorganic chemistry has evolved since Professor Mellor's time t
o include a new generation of quantum mechanics based calculational methods
to understand and predict chemical reaction pathways. Semi-empirical molec
ular orbital (MO) calculations have been used in the fields of glass and si
lica structure analysis, fracture mechanics, set-gel processing of net shap
e optics, porous matrixes for hybrid optics. sensors, and tissue engineerin
g scaffolds. Applications of MO calculations in biomaterials interface reac
tions, biomimetics, and biomineralisation have also been made. Future direc
tions for use of theoretical inorganic chemistry in the ceramic industry ar
e forecast.