Effects of 6% vs 9% Carbamide Peroxide Bleaching Agents on Extracted Teeth Stained by Malaysian Black Coffee

@#Introduction: Human teeth tend to stain from intrinsic and extrinsic factors with time. The study was aimed to assess colour change of stained enamel after the use of bleaching agents. Methods: 63 extracted human teeth were selected and soaked in the coffee solution for 7 days to stain the teeth. Then they were randomly divided into 3 groups (n = 21). The groups were divided as the control group (distilled water), group using 6% carbamide peroxide (CP6) and group using 9% carbamide peroxide (CP9). The groups of CP6 and CP9 were bleached with 0.2 ml of bleaching agent for 5 minutes daily until 14 days. Colour changes were visually recorded by using VITA Toothguide 3D-MASTER and Ocean Optics Spectrometer instrument. Results: CP6 started to show shade reduction on Day 3 (score 5), followed by a steady reduction until Day 10. Day 12 to 14 showed another steady reduction of CP6. CP9 had a larger shade reduction (scores of 2-5) from Day 1 to Day 4, followed by a steady reduction until Day 14. Spectrometer analysis shows that CP9 samples had lower absorbance unit compared to CP6 samples for both second-day and sixth-day groups. However, most changes can be observed on the CP9 samples from control to the second-day and sixth-day. Conclusion: Bleaching agent with low concentration can approach the efficacy of high concentration of bleaching agent with an extended treatment time.

Association with obesity and abdominal obesity according to the kind and amount of coffee intake in Korean adults: 2013 ~ 2016 Korea National Health and Nutrition Examination Survey / 한국영양학회지

PURPOSE: We evaluate the influence of the types of coffee beverage on obesity and abdominal obesity in Korean adults who were aged 19 years or over by using the 2013 ~ 2016 Korea National Health and Nutrition Examination Survey (KNHANES). METHODS: Specific questions were asked about frequency of coffee intake, the type of coffee beverage, the addition of milk and/or sugar to coffee by using the food frequency questionnaire of the 2013 ~ 2016 KNHANES. RESULTS: We found that coffee intake increased the prevalence of obesity and abdominal obesity. After multivariable adjustment, coffee consumption increased the risk of obesity by 1.30 (95% CI: 1.08 ~ 1.57) in the group that drank coffee twice a day, and 1.33 (95% CI: 1.11 ~ 1.60) in the people who drank coffee ≥3 times a day as compared to that of the non-coffee intake group. The risk of abdominal obesity increased to 1.27 (95% CI: 1.02 ~ 1.57) in the < 1 time/day coffee drinking group, 1.34 (95% CI: 1.08 ~ 1.66) in the 1 time/day coffee drinking group, 1.35 (95% CI: 1.09 ~ 1.67) in the 2 times/day coffee drinking group, and 1.40 (95% CI: 1.14 ~ 1.72) in the ≥ 3 times/day coffee drinking group as compared to that of the non-coffee drinking group. The influence of black coffee intake was different according to gender: males showed a high prevalence of abdominal obesity and females showed a high prevalence of obesity. Mixed coffee consumption increased the risk of obesity and abdominal obesity by more than 34% in men who consumed coffee more than 3 times a day and in women who consumed coffee more than 2 times per day. CONCLUSIONS: We found that coffee intake, regardless of the type of coffee, increased the prevalence of obesity and abdominal obesity. It is necessary to refrain from drinking coffee to prevent obesity.

Association of coffee consumption with health-related quality of life and metabolic syndrome in Korean adults: based on 2013 ~ 2016 Korea National Health and Nutrition Examination Survey / 한국영양학회지

PURPOSE: This study examined the association of the type and frequency of coffee consumption with the health-related quality of life and metabolic bio-markers in adult men and women from the 2013 ~ 2016 Korea National Health and Nutrition Examination Survey (KNHANES). METHODS: A total of 11,201 subjects (4,483 men and 6,718 women) were classified according to the type of coffee consumption (non-coffee, black coffee, 3-in-1 coffee) and type and frequency of coffee consumption (non-coffee, ≤2 times/day of black coffee, > 2 times/day of black coffee, ≤2 times/day of 3-in-1 coffee, > 2 times/day of 3-in-1 coffee) using food frequency questionnaires. Dietary nutrient intake data were assessed using food frequency questionnaires. The health-related quality of life was measured using the EuroQol-5 dimension (EQ-5D) and EQ-5D index score. Data on metabolic bio-markers were obtained from a health examination. RESULTS: Among men and women, the proportion of subjects with an energy intake below the estimated energy requirement (EER) was lower among the 3-in-1 coffee consumption group, and the proportion of subjects with iron intakes below the estimated average requirements (EAR) was lower among the 3-in-1 coffee consumption group. Women (OR: 0.810, 95% CI: 0.657 ~ 0.998) with the ≤2 times/day of 3-in-1 coffee had a lower risk of impaired health-related quality of life (lowest 20% level in the EQ-5D score) compared to the non-coffee consumers after a multivariable adjustment. In both men and women, the type and frequency of coffee consumption was not associated with metabolic bio-markers risk after multivariable adjustment. CONCLUSION: These results suggest that 3-in-1 coffee consumption may be associated with a lower risk of impaired health-related quality of life and may not be associated with the metabolic bio-markers risk in adult men and women.

3-in-1 coffee consumption is associated with metabolic factors in adults: Based on 2012~2015 Korea National Health and Nutrition Examination Survey / 한국영양학회지

PURPOSE: This study was conducted to evaluate the risk of metabolic factors in adults consuming 3-in-1 coffee from the 2012~2015 Korea National Health and Nutrition Examination Survey (KNHANES). METHODS: A total of 5,872 subjects (male = 2,253, female = 3,619) aged 19~64 yrs were presented with food frequency questionnaires, and they were classified according to coffee consumption level and types of coffee consumed (black coffee, ≤1 time/day of 3-in-1 coffee, > 1 and ≤2 times/day of 3-in-1 coffee, > 2 times/day of 3-in-1 coffee). Analysis was conducted by gender for age-stratified groups: 19~39 (male = 968 and female = 1,285) and 40~64 (male = 1,468, female = 2,151) yrs old. RESULTS: Black coffee consumption was associated with a significantly higher education level and household income compared to 3-in-1 coffee consumption in both males and females. The > 2 times/day group had significantly more smokers compared to other patterns of coffee consumption in both males and females. In the 40~64 yrs age group, males and females in the > 2 times/day group had significantly lower density of micronutrients such as fiber, niacin, vitamin C, calcium, phosphorus,and potassium compared with black coffee consumption. In the 40~64 yrs age group, males (OR: 2.03, 95% CI: 1.13~3.64) in the > 2 times/day group were at a higher risk of metabolic syndrome compared with black coffee consumption after multivariable adjustment. CONCLUSION: We found that frequency of 3-in-1 coffee consumption may be associated with prevalence of metabolic syndrome in males aged 40~64 yrs.