Mohammad B Rezvani1, Mohammad R Rouhollahi1, Fahimeh Andalib2, Faeze Hamze3. 1. Department of Operative Dentistry, Shahed Dental School Shahed University, Tehran, Islamic Republic of Iran. 2. Department of Operative Dentistry, Isfahan Dental School Isfahan University of Medical Science, Isfahan, Islamic Republic of Iran. 3. Assistant Professor, Oral and Dental Disease Research Center, Kerman University of Medical Science, Kerman, Islamic Republic of Iran, Phone: +983432126024, e-mail: f_hamzeh@kmu.ac.ir and faeze.hamze@gmail.com.
Abstract
INTRODUCTION: Since one of the most important disadvantages of soft drinks includes their adverse effect on mineral content of enamel because of their low pH, this study examined the microhardness of enamel before and after exposure to a soft drink containing different concentrations of nano-hydroxyapatite (nano-HA) as an additive. MATERIALS AND METHODS: Sixty caries free human premolars were mounted in epoxy resin. After polishing, the baseline micro-hardness was recorded three times for each specimen using a Vickers indenter at 50 gm load. Subsequently, the samples were divided into six groups, which were treated for 5 minutes at 9°C by a cola-based drink contacting 0, 0.5, 1, 5, and 10 wt.% of nano-HA while the control group was immersed in artificial saliva. Ultimately, the final microhardness was assessed three times again for each specimen. RESULTS: Paired t-test showed that in groups containing 0 and 0.5 wt.% of nano-HA, the microhardness was significantly reduced after treatment protocol (p = 0.00 and 0.01 respectively). Whereas in the other groups the microhardness was not significantly changed after treatment (p > 0.05). CONCLUSION: Pure cola-based drink has a pronounced adverse effect on enamel microhardness, while admixing it with nano-HA could act as a protective factor. CLINICAL SIGNIFICANCE: Although soft beverages are hazardous to tooth structure, some additives could compensate their adverse effect.
INTRODUCTION: Since one of the most important disadvantages of soft drinks includes their adverse effect on mineral content of enamel because of their low pH, this study examined the microhardness of enamel before and after exposure to a soft drink containing different concentrations of nano-hydroxyapatite (nano-HA) as an additive. MATERIALS AND METHODS: Sixty caries free human premolars were mounted in epoxy resin. After polishing, the baseline micro-hardness was recorded three times for each specimen using a Vickers indenter at 50 gm load. Subsequently, the samples were divided into six groups, which were treated for 5 minutes at 9°C by a cola-based drink contacting 0, 0.5, 1, 5, and 10 wt.% of nano-HA while the control group was immersed in artificial saliva. Ultimately, the final microhardness was assessed three times again for each specimen. RESULTS: Paired t-test showed that in groups containing 0 and 0.5 wt.% of nano-HA, the microhardness was significantly reduced after treatment protocol (p = 0.00 and 0.01 respectively). Whereas in the other groups the microhardness was not significantly changed after treatment (p > 0.05). CONCLUSION: Pure cola-based drink has a pronounced adverse effect on enamel microhardness, while admixing it with nano-HA could act as a protective factor. CLINICAL SIGNIFICANCE: Although soft beverages are hazardous to tooth structure, some additives could compensate their adverse effect.
Authors: Andrea Scribante; Mohammad Reza Dermenaki Farahani; Giorgio Marino; Claudia Matera; Ruggero Rodriguez Y Baena; Valentina Lanteri; Andrea Butera Journal: Biomed Res Int Date: 2020-01-30 Impact factor: 3.411