Nanohydroxyapatite and Novamin on Roughness and Discoloration Following Orthodontic Adhesive Removal

Objective: The purpose of the study was to assess the impact of two types of toothpaste containing Nanohydroxyapatite and Novamin on teeth surface roughness and teeth discoloration following orthodontic brackets debonding and adhesive removal. Material and Methods: Eighty human premolars were extracted before starting orthodontic treatment and used as the samples for the current study. All samples were attached with metal brackets and then divided at random into two groups (n=40) by using toothpaste containing either Nanohydroxyapatite (Lacalut white and repair toothpaste) (LSH) and toothpaste containing Novamin (Sensodyne repair and protect) (LSN). The adhesive removal was done using a stainbuster bur system and wearing dental Loupes at a low-speed handpiece. All the colors of the teeth were first evaluated with a VITA easyshade® spectrophotometer. In addition, enamel surface roughness measurements were done using Stylus Profilometry (Surface roughness tester Time®3200). The records were done as first measurements (E1) and (R1). The second records for the teeth (E2) and (R2) were done after adhesive removal. A third record was done after the staining procedure by immersion of teeth in black tea as (E3) and (R3). Finally, the fourth measurements were carried out after brushing the teeth with Novamin toothpaste and Nanohydroxyapatite toothpaste as (E4) and (R4). Results: The outcomes were analyzed statistically via T-test (P ≤ 0.05). The results displayed a statistically considerable effect in reducing the enamel surface roughness for both groups (LSH) and (LSN), with no difference between the two groups. In addition, both groups had a statistical impact on changing the color of the teeth, with a higher effect of (LSN) group than the (LSH) group. Conclusion: Novamin and Nanohydroxyapatite toothpaste had a considerable impact in reducing enamel surface roughness. However, Novamin toothpaste showed better results than Nanohydroxyapatite in reducing enamel discoloration.