Effect of Chinese Green Tea on Enamel Surface Characteristics in an in-vitro Erosion Model

Abstract

Objectives: Erosive tooth wear is a common worldwide problem. It manifests due to consumption of high caloric and low pH acidic drinks such as carbonated soft drinks and fruit juices, which cause irreversible damage to dental hard tissues. The aim of this study was to evaluate the effect of Chinese green tea on surface characteristics of eroded enamel in an in-vitro erosion model. Materials and methods: Twenty sound extracted human premolars were selected. Micro-hardness and surface roughness were measured before conducting the experimental test to serve as raw data (control), after immersion in Coca-Cola with a pH of 2.8 for 1 hour, 3 times a day for 3 days and then after immersion in green Chinese tea solution for 1 hour 3 times a day for 3 days. The surface micro-hardness was measured using Vicker's diamond under a load of 50 grams for 15 seconds while the surface roughness was measured using Taly-surf. Results: The data were analysed using paired t-test. The micro-hardness measurements obtained before green tea treatment (Mean=102.46, SD=24.82) were significantly lower than those which were obtained after green tea treatment (Mean=158.9, SD=41.44), p=0.0001. The roughness measurements obtained before green tea treatment (Mean=7.34, SD=1.76) were significantly higher than those which were obtained after green tea treatment (Mean=5.14, SD=1.8), p=0.0001. Conclusion: Chinese green tea positively affected the surface characteristics of eroded enamel.

Remineralization and Antibacterial Efficacy of Different Concentrations of Aqueous Stevia extract and green tea Solutions in Comparison with Fluoride-based Mouthwash on Initial Enamel Carious Lesion- An Invitro Study

“…Green tea with both concentrations confirmed the highest remineralizing effect on initial demineralized enamel which were in agreement with Aidaros et al and Talaat with no harmful effect on enamel (14) . The results was also supported by S. Amal et al study who concluded that green tea was the highest remineralizing efficacy than 0.05% sodium fluoride (33) .…”

“…Other studies have also demonstrated the inhibition of salivary amylase activity that may contribute significantly to reducing the cariogenicity of starch-containing foods by extracts of a commercial tea (17) . Green tea contains high fluoride content (17,30) and also high pH value which is about 6.3 (14) that may be the reason of being a remineralizing agent.…”

“…To Evaluate the remineralizing effect of Aqueous Stevia extracts and green tea in Comparison with Fluoride-based Mouthwash on Initial Enamel Carious Lesion, ANOVA test or an equivalent nonparametric test was used for comparison between 6 experimental and control groups. According to Rajab et al (2018) (14) , surface micro-hardness varied from 158.9±40.4 in experimental group, to 317.4±102.5 in control. Based on Rajab et al (2018) (14) and Using G power statistical power Analysis program (version 3.1.9.4) for sample size determination (15) , A total sample size (n=60); equally divided to 10 in each group) will be sufficient to detect a large effect size (f) =0.49, with an actual power (1-β error) of 0.8 (80%) and a significance level (α error) 0.05 (5%) for two-sided hypothesis test.…”

“…According to Rajab et al (2018) (14) , surface micro-hardness varied from 158.9±40.4 in experimental group, to 317.4±102.5 in control. Based on Rajab et al (2018) (14) and Using G power statistical power Analysis program (version 3.1.9.4) for sample size determination (15) , A total sample size (n=60); equally divided to 10 in each group) will be sufficient to detect a large effect size (f) =0.49, with an actual power (1-β error) of 0.8 (80%) and a significance level (α error) 0.05 (5%) for two-sided hypothesis test.…”

The Effects of an Experimental Green Tea Extract Gel on the Surface Roughness of Bleached Teeth with Carbamide Peroxide Gels

“…Green tea is a leading drink in the Far East for thousands of years before it became a popular hot and cold drink worldwide. Many studies have suggested that the consumption of green tea is associated with the reduction of the risk of several pathologies and an increasing number of evidences mentioning a beneficial role of green tea in oral health [9].…”