Patent ID: 7264665

Claim:
A dental cement comprising a dental glass comprising: Oxide Proportion a member selected from the group [[30]] 35 to 60% by consisting of Y 2 O 3 , weight La 2 O 3 , Gd 2 O 3 , Yb 2 O 3 , and Lu 2 O 3 or 20 to 50% by weight Sc 2 O 3 by itself Al 2 O 3 15 to 40% by weight SiO 2 15 to 50% by weight P 2 O 5 0 to 2% by weight at least one of MgO, CaO, SrO, ZnO, and 0 to 8% by weight BaO at least one of Li 2 O, Na 2 O, K 2 O, Rb 2 O, 0 to 2% by weight and Cs 2 O at least one of TiO 2 , ZrO 2 , and HfO 2 0 to 4% by weight at least one of V 2 O 5 , Nb 2 O 5 , and 0 to 4% by weight Ta 2 O 5