title: The effect of remin pro and MI paste plus on bleached enamel surface roughness.
abstract: OBJECTIVE
  The growing demand for enhanced esthetic appearance has led to great developments in bleaching products. The exposure of hard tissues of the tooth to bleaching agents can affect the roughness of the enamel surface. The freshly bleached enamel surface exposed to various surface treatments such as fluoride and other remineralizing agents have been assessed in this study. The aim of this experimental study was to compare the effect of Casein Phosphopeptide-Amorphous Calcium Phosphate with Fluoride (MI Paste Plus) and Remin Pro on the enamel surface roughness after bleaching.
  
  
  METHODS
  Thirty enamel samples of sound human permanent molars were prepared for this study. After initial roughness measurement with profilometer, the samples were exposed to 37% carbamide peroxide bleaching agent 20 minutes twice, and randomly divided into three groups of ten. In group 1, a CPP-ACPF containing paste (MI Paste Plus) and in group 2, Remin Pro were applied to the teeth during a 15 day period for 5 minutes, twice a day. Samples of group 3 (control) were immersed in artificial saliva for 15 days. The roughness of all samples were measured at the beginning, after bleaching and after the study intervention and statistically analyzed.
  
  
  RESULTS
  The surface roughness significantly increased in all groups following bleaching, and then it showed a decrease after application of both Remin Pro and CPP-ACPF in comparison to using bleaching agent (P<0.005). The surface roughness after using Remin Pro and CPP-ACPF was statistically similar to each other (P>0.05).
  
  
  CONCLUSIONS
  There was no difference between surface roughness of MI Paste Plus and Remin Pro groups. Also the surface roughness was decreased compared to the initial enamel surface roughness.
authors.affiliation: Assistant Professor, Department of Operative Dentistry, Islamic Azad University, Dental Branch, Tehran, Iran.
authors.forename: Haleh
authors.initials: H
authors.lastname: Heshmat
authors.affiliation: Assistant Professor, Department of Operative Dentistry, Islamic Azad University, Dental Branch, Tehran, Iran.
authors.forename: Maryam Hoorizad
authors.initials: MH
authors.lastname: Ganjkar
authors.affiliation: Dentist, Dental Research Center, Tehran University of Medical Sciences.
authors.forename: Solmaz
authors.initials: S
authors.lastname: Jaberi
authors.affiliation: Epidemiologist, Dental Research Center, Tehran University of Medical Sciences.
authors.forename: Mohammad Javad Kharrazi
authors.initials: MJ
authors.lastname: Fard
keywords: Bleaching Agents; CPP-ACP; Surface properties; Tooth Remineralization