Bone cements are an important class of biomaterial used in hard tissue surgery as well as periodontology. Many of these are glass-ionomer cements formed from an aluminosilicate glass and a polyacrylic acid. There has been some concern regarding the neurotoxicity of aluminium ions in vivo and research is now focussed on alternative materials for the glass component. Gallium phosphate based glasses represent one such alternative. Not only does gallium act in a similar way to aluminium in phosphate glasses, it is also known to show antibacterial properties. The present study is aimed at establishing the structural role of gallium in candidate glasses for bone cements using reverse Monte Carlo Analysis of diffuse neutron scattering data. These results will be used to give an overall picture of the glass structure and the ability of Ga3+ ions to participate in cement formation.