The mechanism of erosion of a glass ionomer cement (PR Scell) was stud
ied using two experimental procedures: discs of dental cement were imm
ersed in distilled water under unrenewed conditions as defined by ISO
standard or under continuously running distilled water to simulate the
oral environment. Both experiments suggest that erosion is important
and highly correlated to the cryolithe material included in the formul
ation of this cement.