| Autor: |
Silva IFD; Universidade Estadual Paulista - Unesp, School of Dentistry of Araçatuba, Department of Preventive and Restorative Dentistry, Araçatuba, SP, Brazil., Capalbo LC; Universidade Estadual Paulista - Unesp, School of Dentistry of Araçatuba, Department of Preventive and Restorative Dentistry, Araçatuba, SP, Brazil., Dal-Fabbro R; University of Michigan, School of Dentistry, Department of Cariology, Restorative Sciences, and Endodontics, Ann Arbor, MI, USA., Paiva MF; Universidade Estadual Paulista - Unesp, School of Dentistry of Araçatuba, Department of Preventive and Restorative Dentistry, Araçatuba, SP, Brazil., Hosida TY; Universidade Estadual Paulista - Unesp, School of Dentistry of Araçatuba, Department of Preventive and Restorative Dentistry, Araçatuba, SP, Brazil., Báez-Quintero LC; Universidad Cooperativa de Colombia, Facultad de Odontologia, Bogotá, Colombia., Sampaio C; Universidade Estadual Paulista - Unesp, School of Dentistry of Araçatuba, Department of Preventive and Restorative Dentistry, Araçatuba, SP, Brazil., Monteiro DR; Universidad Cooperativa de Colombia, Facultad de Odontologia, Bogotá, Colombia., Delbem ACB; Universidade Estadual Paulista - Unesp, School of Dentistry of Araçatuba, Department of Preventive and Restorative Dentistry, Araçatuba, SP, Brazil., Pessan JP; Universidade Estadual Paulista - Unesp, School of Dentistry of Araçatuba, Department of Preventive and Restorative Dentistry, Araçatuba, SP, Brazil. |
| Abstrakt: |
This study evaluated the effect of fluoride varnishes containing micrometric or nanosized sodium trimetaphosphate (TMP) on dentin erosive wear in vitro. Bovine root dentin blocks were selected by surface hardness and randomly divided into five experimental groups/varnishes (n = 20/group): placebo, 5% sodium fluoride (NaF); 5% NaF+5% micrometric TMP; 5% NaF+2.5% nanosized TMP; and 5% NaF+5% nanosized TMP. Half of the surface of all blocks received a single application of the assigned varnish, with subsequent immersion in artificial saliva for 6 h. Varnishes were then removed and the blocks were immersed in citric acid (90 s, 4×/day, 5 days). After each erosive cycle, ten blocks of each group were immersed in a placebo dentifrice for 15 s (ERO), while the other ten blocks were subjected to abrasion by brushing (ERO+ABR). Dentin erosive wear was assessed by profilometry. Data were submitted to 2-way ANOVA and to the Holm-Sidak test (p<0.05). Dentin erosive wear was significantly higher for ERO+ABR than for ERO for all varnishes. TMP-containing varnishes promoted superior effects against dentin erosive wear compared with 5% NaF alone; and 5% nanosized TMP led to the lowest wear among all varnishes. In conclusion, the addition of TMP to conventional fluoride varnish (i.e., varnish containing only NaF) enhanced its protective effects against bovine root dentin erosion and erosion+abrasion. Additionally, the use of 5% nanosized TMP led to superior effects in comparison to 5% micrometric TMP, both for erosion and erosion+abrasion in vitro. |
