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KMID : 0355420120360030161
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Journal of Korean Academy of Oral Health
2012 Volume.36 No. 3 p.161 ~ p.166
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Original Articles : Effect of mouthrinse with low pH on the surface microhardness of artificial carious enamel
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Choi Hye-Jin
Lee Hye-Jin
Jeong Seong-Soog
Choi Choong-Ho
Hong Suk-Jin
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Abstract
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Objectives: The aim of the present study was to evaluate the effect of fluoride mouthrinse with low pH on the surface microhardness of artificial incipient carious enamel.
Methods: Firstly, the concentration of sodium fluoride and pH values were measured in commercially available mouthrinse. Secondly, DOCTOR Clean & Fresh(R) (Jang In Pharm, co., LTD. KOREA) with 0.02% sodium fluoride and pH value below pH 4.0 was selected as the experimental group, 0.02% sodium as the positive control group and distilled water as the negative control group. Enamel samples of n vine teeth (n=36) were divided into the three groups respectively and treated with the mouthrinse solutions for 3 and 20 minutes. The surface microhardness (Vickers hardness number, VHN) was measured with microhardness tester before and after the treatments.
Results: The average pH of DOCTOR Clean & Fresh(R) was 3.45±0.00, and it was acidic enough to cause tooth erosion. The difference of surface microhardness (ΔVHN) before and after the 20 minute treatment was statistically significant among the groups: DOCTOR Clean & Fresh(R) (12.77±2.25 ΔVHN), distilled water (0.24±0.75 ΔVHN), 0.02% sodium fluoride solution (―0.62±1.62 ΔVHN) (P＜0.05). The DOCTOR Clean & Fresh(R) group with low pH showed greater changes on the surface microhardness of the carious enamel than those of other groups (P＜0.05).
Conclusions: It is suggested that the mouthrinse with low pH can reduce the surface microhardness of incipient carious enamel.
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KEYWORD
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Dental erosion, Incipient carious enamel, Mouthrinse, NaF
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