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Changes in colonization of streptococcus mutans onto enamel surface owing to bleaching and remineralization

LU Zhi-shan, LIU Zhong-hao, SUN Ji-jun, LIU Hao,LI Ya-nan,JIANG Guang-shui. Department of Oral Medicine , School of Dentistry, Shangdong University, Jinan 250012 China  
Objective:To observe the influence of bleaching and remineralization on adhesion of streptococcus mutans to enamel surface. Method: Healthy premolars that would be extracted according to the therapeutic schedule were bleached in vitro and in vivo respectively. After bleaching in vitro, the teeth were immerged in physiological saline solution, artificial saliva and remineralization solution respectively. Meanwhile, after bleaching in vivo, patients were had their mouths rinsed with either physiological saline solution or remineralization solution. Streptococcus mutans were isolated from the enamel surfaces and cultivated for counting.Result: Both in vitro and in vivo bleached enamel of all experimental groups showed increased colonies of S. mutans. In addition, the adhere ability to enamel surfaces which were treated with solution in vitro and in vivo groups was lower than other groups.Conclusion: The adhering ability to enamel by S. mutans after bleaching was enhanced, while simultaneously applying remineralization solution could reduce the adhesion of S. mutans to enamel surface after bleaching.
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