Whitening effect and morphological evaluation of hydroxyapatite materials
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Published on: February 23, 2017
Alp Dabanoglu1, Claudia Wood, Franklin García-Godoy
1Ludwig Maximilians University, Faculty of Dentistry, Department of Operative Dentistry and Periodontology, Goethe Str. 70, D-80336 Munich, Germany.
Purpose:
To measure the efficacy of the whitening effect of non-oxidizing and non-acidic nano- and micro-hydroxyapatite materials on the enamel surface and to evaluate the surface changes after treatment.
Methods:
Three hydroxyapatite suspensions and two hydroxyapatite mixtures in dissolvable polymer films were applied to a total of 30 extracted caries-free human premolars. After the last material application, a hydrodynamic shear force was generated and applied for 2 minutes to all teeth to simulate mechanical loading of the surface. The tooth color was measured with a dental spectrophotometer. The mean changes of the L*a*b* values between different measurements in each group were expressed as delta E and were analyzed with ANOVA and the Tukey's post-hoc test.
Results:
The groups of the nano-hydroxyapatite, the hydroxyapatite-nanocrystals and the tricalcium-phosphate exhibited significant delta E values between baseline and after hydrodynamic shear force application (P<0.05). In conclusion, the materials used in the study are very promising alternatives to oxidizing bleaching agents.
