Method: 80 composite samples were prepared. Samples were classified into 4 main groups (n=20): Control, Colgate Motion Whitening Toothbrush (CWT), Opalescence Whitening Toothpaste (OWT) and Beyond Pearl White Toothpaste (BPW). Control group was stored in distilled water for 14 day, as baseline. CWT brushing were applied 2 minutes a day with distilled water or OWT or BPW for 14 days. After 14 days, surface roughness (Sa) was measured by non-contact 3D laser profilometer and surface hardness (VHN) was measured by Vickers tester. 16 samples were evaluated under SEM. Kruskal Wallis, post Hoc Dunn’s multiple comparison, Mann Whitney U tests were used in the comparison of groups. Statistical significance level was established at p<0,05.
Result: Although roughness’s of the hybrid and nano filled composites were significantly increased (p<0,05), there are no significant changes were measured in surface hardness of CWT brushed composite specimens (p≥0,05). Hybrid composite showed the most roughness surface after brushing with BPW (32,62±6,17). No structural changes were detected on SEM micrographs of all groups after brushing.
Conclusion: The effect whitening toothpaste on the surface hardness and roughness of resin composites depend on dentrifice ingredients and composite structure.
1Bisco Aelite, 2Voco Grandio, 3 Kurarary Clearfil Majesty, 43M Filtek Silorane