effect of casein phosphopeptide-amorphous calcium phosphate and acidulated phosphate fluoride gel on erosive enamel wear

background: some studies have shown that casein phosphopeptide-amorphous calcium phosphate (cpp-acp) and acidulated phosphate fluoride (apf) gel can protect teeth against erosion. the aim of this study was to assess whether cpp-acp and fluoride could reduce enamel wear rates under erosive conditions simulating abrasion and acidic diet regimen. materials and methods: enamel specimens consisted of 3 experimental groups (receiving cpp-acp, apf or both) and a control group. specimens were subjected to 5,000 wear cycles at a load of 30 n and a ph of 3 in a tooth wear machine. the amount of wear was determined by stereomicroscope. data were analyzed using one-way analysis of variance and tukey post hoc tests (a = 0.05). results: mean wear rate (mean±sd) was 194.6±49.2 micrometers in cpp-acp group, 197.6±39.5 in apf group, 134.6±44.7 in combination group and 266.2± 22.7 in the control group. statistical analysis indicated significantly higher wear rate in the control group than the experimental groups and also in the cpp-acp and apf group than the combination group ( p< 0.05). conclusions: we concluded that although either cpp-acp or apf can protect enamel against wear, their combination provides significant enamel wear reduction. these findings would lead to new strategies for the clinical management of tooth wear. key words: casein phosphopeptide-amorphous calcium phosphate, enamel, fluoride, wear