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A series of binary tellurite-phosphate glasses in the form [TeO2]0.81[P2O5]0.19 doped with different rare-earth oxides were prepared. The rare-earth oxides were: La2O3, CeO2, Pr2O3, Nd2O3, Sm2O3, and Yb2O3. The optical absorption coefficient and infrared spectra were measured in the ranges 200–900 nm and 200–1000 cm−1, respectively. It is found that the fundamental absorption edge depends upon the kind of the dopant cation. The infrared spectra of these doped glasses indicate that the rare-earth oxides are connected to the chains of TeO4.

Biting force was related mainly to the quality of denture support. Muscle activity was higher in patients with conventional denture than with implant-supported prostheses (with or without attachments).

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