Effects of tooth-brushing force with a desensitising dentifrice on dentine tubule patency and surface roughness.

Objectives: To investigate the effects of a 5% NovaMin containing dentifrice on dentine tubule patency and surface roughness at 100g and 400g tooth brush abrasion forces.

Methods: 75 polished human dentine samples were prepared and randomly allocated into one of five groups; control (1), NaPFO 100g abrasion force (2), NovaMin 100g (3), NaPFO 400g (4) and NovaMin 400g (5). The control group underwent two 2-min cycles of artificial saliva (AS), one 2-min erosion cycle; the rest underwent two toothbrush abrasion cycles in an AS/dentifrice slurry and one 2-min erosion cycle.