ABSTRACT
Objective:To study the effect of calcium sodium phosphosilicate(CSP)on the enamel remineralization of primary teeth. Methods:30 extracted human healthy primary molars were collected.Each tooth was cut bucco-lingually and mesial-distally into 4 sections.The sections were assigned randomly into 4 groups(n =30).Demineralization and remineralization cyclic model was estab-lished by etching with 35% phosphate acid for 2 min and then treated by unexposure of the sample to nothing(control,group A),so-dium monofluorophosphat(MFP,group B),CSP(group C)and MFP +CSP(group D).The cyclic was repeated twice daily for 30 d. The enamel surface morphology was observed by SEM and the surface microhardness(SMH)was measured.Results:On the tenth day,squamous morphology was observed on the enamel surface of group A and that of group D appeared less demineralization.The SMH value of group D was significant higher than that of group A(P <0.05).On the thirtieth day,obvious demineralization was ob-served in group A.Group B,C and D appeared surface remineralization.The SMH value of group B,C and D was significant higher than that of group A(P <0.05).Highest SMH value was achieved in group D.Conclusion:CSP combined with fluoride is more ef-fective in the enamel remineralization of primary teeth than the single application of them.
ABSTRACT
AIM: The objective of present study was to assess the effect of commonly used energy drinks on surface micro hardness of tooth color restorative materials. MATERIAL AND METHODS: Sixty discs of all material were prepared in polytetrafluoroethylene mold which was 10 mm in diameter and 2 mm in thickness. Two groups were made for each material containing 10 discs; G1/G2 (vitofil), G3/G4 (vitremere), G5/G6 (Filtek Z350). After 24 hours, the discs were polished. Group 1, group 3 and group 5 were immersed in red bull for 2 minutes during whole expereiment. Group 2, group 4 and group 6 were immersed in jolt cola for 2 minutes during whole expereiment. Microhardness test were performed in digital micro hardness tester before and after immersion at different time interval. The results were statistically analyzed with the help of two-way ANOVA with repeated measurement and Tukey's test. RESULTS: According to time interval for vitofil and vitremere there is insignificant difference between baseline and day 1 surface micro hardness values (p>0.001). Significant difference is seen between baseline micro hardness and day 7 day 14,day 30 (p<0.001). Inverse is true for Filtek Z350 there is significant difference between base line and day 1 micro hardness values(p<0.001). The difference between base line, day 7, day 14 and day 30 is insignificant (p>0.001). According to immersion media there is insignificant difference between both of them (p>0.001). CONCLUSION: The effect of energy drinks on the surface micro hardness of a restorative material depends on the duration of contact time and the material composition not on the type of drink.