수종 인공타액의 초기인공우식 법랑질 재광화 효과에 대한 비교연구

정성숙 ( Seong-soog Jeong ),정기호 ( Ki-ho Chung ) 대한예방치과·구강보건학회 2017 大韓口腔保健學會誌 Vol.41 No.1

Objectives: The purpose of this study was to compare enamel remineralization effects of human whole saliva and currently available artificial saliva compositions, using teeth exposed to chemical pH cycling conditions, and to obtain data that can inform future design and manufacturing of additional artificial saliva compositions. Methods: Seventy-two specimens of bovine tooth enamel were embedded in resin, then polished and exposed to a lactate/carbopol buffer system for 48-52 hours. Specimens were allocated into six experimental groups (n=12 specimens per group) by randomized blocks, such that each group contained an equivalent proportion of specimens at each Vickers hardness number (VHN) stratum: deionized water as a negative control, human whole saliva and artificial saliva compositions A, B, C and D. Surface hardness was measured before and after 15 days of chemical pH cycling. Surface microhardness was measured (Fm-7, Future-tech Corp, Japan) before and after treatment with test saliva compositions. Oneway ANOVA, with post hoc Tukey test, was used to evaluate statistical differences with a significance threshold of P<0.05 . Results: The intragroup changes in microhardness (△VHN) for treatment with each saliva composition were (in ascending order of △VHN): -0.39±16.08 (deionized water control), 7.32±11.52 (artificial saliva B), 39.18±11.94 (artificial saliva C), 3.83±13.81 (artificial saliva D), 62.44±29.23 (artificial saliva A) and 102.90±25.89 (human whole saliva). Enamel treated with human saliva, or with artificial saliva compositions A, C, or D, demonstrated comparatively greater microhardness than enamel treated with deionized water or artificial saliva B. There was no difference in surface hardness between enamel treated with artificial saliva B and enamel treated with deionized water. Conclusions: Our study suggests that human saliva and artificial saliva compositions A, C, and D are effective remineralization solutions for use in pH cycling.

정상법랑질에서 1,500 ppm 불소함유 치약의 치아부식증 예방 효과

정성숙 ( Seong-soog Jeong ),정기호 ( Ki-ho Chung ) 대한예방치과·구강보건학회 2017 大韓口腔保健學會誌 Vol.41 No.3

Objectives: The purpose of this study was to evaluate the effect of a dentifrice containing 1,500 ppm F (NaF) and 2% bamboo salt on dental erosion caused by ingestion of acidic beverages. Methods: Specimens of extracted bovine teeth enamel were embedded in a resin and polished. Experimental specimens were subjected to one of the six treatments (n=10 per treatment group): the experimental group consisted of 1,500 ppm F (NaF)+2% bamboo salt; 1,500 ppm F (NaF); 1,000 ppm F (NaF)+2% bamboo salt; 1,000 ppm F (NaF); free fluoride+2% bamboo salt; and free fluoride. The specimens were exposed to the experimental dentifrice, an acidic beverage, and artificial saliva. The treated specimens were analyzed using a Vickers surface hardness test and scanning electron microscopy (SEM). Surface hardness and SEM were compared before and after the chemical pH cycling sequences for 12 days. Results: Group 1 (1,500 ppm F+2% bamboo salt) showed the highest surface hardness, followed by group 2 (1,500 ppm F), group 3 (1,000 ppm F+2% bamboo salt), group 4 (1,000 ppm F), group 5 (free fluoride+2% bamboo salt), and group 6 (free fluoride), in that order. Upon observing the surface by SEM, when bamboo salt was used and when the NaF concentration was higher, the enamel was denser and the surface was more highly remineralized. Conclusions: The use of a higher concentration of NaF and bamboo salt resulted in a higher preventive effect on tooth erosive potential. The addition of bamboo salt to dentifrice containing a high concentration of NaF can contribute to preventing dental erosion.

발효음료섭취시 재광화물질 적용에 따른 초기우식치아의 치아부식증 예방효과

김지은 ( Ji-eun Kim ),정성숙 ( Seong-soog Jeong ),정기호 ( Ki-ho Chung ),최충호 ( Choong-ho Choi ) 대한예방치과·구강보건학회 2020 大韓口腔保健學會誌 Vol.44 No.4

Objectives: The purpose of this study was to investigate the possibility of preventing dental erosion caused by fermented milk in early carious teeth by applying 0.2% sodium fluoride to the tooth surface and adding 0.5% calcium to the drink. Methods: We selected the experimental drink Yakult, which is the best-selling domestic fermented milk drink. A total of five groups were selected as experimental groups (mineral water, fermented milk, 0.2% NaF+fermented milk, 0.2% NaF+(fermented milk+0.5% Ca), and 0.2% NaF+Distilled water groups). After forming the artificial early caries, the pH cycling was administered for five days to derive surface microhardness and scanning electron microscope (SEM) image results. Results: When comparing the surface microhardness before and after treatment in each group, significant differences were found among the four groups (P< 0.05), except in the fermented milk group (P >0.05). A comparison of the difference in surface microhardness before and after pH cycling among the groups revealed a significant difference (P< 0.05). There was no significant difference between the 0.2% NaF+(fermented milk+0.5% Ca) group, 0.2% NaF+distilled water group, and the mineral water group (P >0.05). The 0.2% NaF+fermented milk and fermented milk groups showed significant differences from the other groups (P< 0.05). In the SEM image, 0.2% NaF+(fermented milk+0.5% Ca), 0.2% NaF+distilled water, and mineral water groups (P >0.05) showed smoother surfaces than the 0.2% NaF+fermented milk and fermented milk groups. Conclusions: Based on these results, it was confirmed that if 0.5% calcium was included in the fermented milk along with the fluoride mouth rinsing program in schools using 0.2% fluoride every week when drinking fermented milk, it is possible to effectively prevent dental erosion even in early carious teeth.

시판 매실음료에 칼슘첨가시 치아부식증 억제 효과

김지은 ( Ji-eun Kim ),윤인경 ( In-gyeong Yun ),정성숙 ( Seong-soog Jeong ),정기호 ( Ki-ho Chung ),최충호 ( Choong-ho Choi ) 대한예방치과·구강보건학회 2019 大韓口腔保健學會誌 Vol.43 No.3

Objectives: We examined the effect of commercial plum beverages on dental erosion and whether the addition of calcium to these beverages would inhibit dental erosion. Methods: We analyzed three groups as follows: Maesil 1 group (Chorok Maesil), Maesil 2 group (Sunkist plum), both of which were selected from commercially-available plum beverages, and Calcium-added maesil group (addition of 3% calcium to Chorok Maesil). For negative and positive control groups, Jeju Samdasoo and Coca Cola were selected, respectively. The characteristics of the experimental beverages were analyzed, and the specimens were immersed in the experimental beverage. The degree of erosion was measured by Vickers hardness number (VHN) and scanning electron microscope images. Results: Positive control group had the lowest pH (2.50±0.03), followed by Maesil 2 (pH 2.59±0.01), Maesil 1 (pH 2.81±0.02), calcium-added maesil (pH 4.19±0.01), and negative control group (pH 7.57±0.06). Significant differences were found in surface microhardness between positive control, Maesil 1, Maesil 2 and calcium-added maesil group before immersion and at 30 minutes after immersion (P<0.05), and change in VHN (positive control group, ―80.94±20.63; Maesil 1 group, ―69.33±24.88; and Maesil 2 group, ―78.49±18.60 in comparison with negative control group, ―6.57±26.73). There was no significant difference (P<0.05) in change in VHN between calcium-added maesil (―13.02±17.33) and negative control group. Conclusions: Plum beverages can potentially induce dental erosion due to their low pH. However, adding calcium to these beverages can reduce the risk of dental erosion. Therefore, the risk of dental erosion must be considered during consumption of plum beverages, and the addition of calcium into plum beverages may be considered as a way to prevent dental erosion.

특별강연발표초록 : 광섬유 소재의 개발 및 현황

정기호 (정)( Ki Ho Chung ) 한국화학공학회 1984 춘계총회초록집 Vol.- No.-