Introduction:To compare the effects of 0.05% sodium fluoride (NaF) mouthrinse, GC Tooth Mousse and GC MI Paste Plus on white spot formation inhibition. Materials and Methods:Thirty pairs of extracted human premolars were cut in half mesio-distally with a disc. The teeth were coated with nail varnish, except a part of the buccal and/or lingual enamel, which was used as the test area, and then divided into 4 groups randomly: A) control, B) 0.05% NaFmouthrinse, C) Tooth Mousse, D) MI Paste Plus. Therapeutic agents were applied once daily following the manufacturer's directions in a PH-cycling model over 35 days. At the end of the experiment, all the specimens were examined in order to detect white spot formation before and a er drying (scoring 0-2). Mann Whitney test was used for statistical analysis. Results:The mean of the white spot scores in groups B (0.16), C (1.4) and D (1.2) were significantly lower than group A (2). Significantly lower mean of white spot scores was found in NaFmouthrinse group compared with two other products. No significant difference was observed between Tooth Mousse and MI Paste Plus.Conclusion: Although 0.05% NaF mouthrinse, GC Tooth Mousse and GC MI Paste Plus are effective preparations to inhibit white spot formation, NaFmouthrinse has better efficacy than CPP-ACP (casein phosphopeptide-amorphous calcium phosphate) products.
Aim:Overhang is the extension of restorative material beyond the cavity preparation. It changes sulcus microflora into organisms conducive to chronic periodontitis. After overhang removal the gingival index and microflora return to a healthy state. This can also improve access for dental plaque removal. The aim of this study was to compare the efficacy of three different instruments in association with amalgam overhang removal. Materials and methods:One hundred thirty-five intact premolars were selected. The teeth were restored with amalgam such that restorations had 1 mm overhangs. Overhangs were removed employing three different instruments in three groups: sickle scaler, ultrasonic scaler, and diamond flame bur. A stereomicroscope was utilized to evaluate both the level of smoothness in the restored area, tooth damage and probable gaps. The data were analyzed using post hoc and Chi-square. Results:The minimum and maximum time of removal were respectively obtained by ultrasonic scaler and sickle scaler, which was statistically significant (p <0.0001). Also, smoothness of the restored area in the sickle scaler group was significantly less than the other methods (p <0.0001).The percentage of tooth damage in the diamond flame bur group was significantly greater than the others (p <0.0001). The data concerning gap size showed no significant difference. Conclusion:Ultrasonic scaler causes no significant damage to the tooth during an overhang removal procedure. In addition, it offers an acceptable level of surface smoothness in restorations and decreases the required time for overhang removal.Clinical significance: Ultrasonic scaler can be recommended as an effective instrument for amalgam overhang removal.
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