Hydraulic conductance of dentin after treatment with fluoride toothpaste containing sodium trimetaphosphate microparticles or nanoparticles

Author(s)

Favretto, Carla Oliveira ^{[1, 2]} ; Botazzo Delbem, Alberto Carlos ^[1] ; Alves Toledo, Priscila Toninatto ^[1] ; Pedrini, Denise ^{[3, 4]}

Affiliation

^[1] Sao Paulo State Univ, Sch Dent, Dept Prevent & Restorat, UNESP, Aracatuba, SP - Brazil

^[2] Fac Morgana Potrich FAMP, Sch Dent, Mineiros, Go - Brazil

^[3] Sao Paulo State Univ, Sch Dent, Dept Diag & Surg, UNESP, Aracatuba, SP - Brazil

^[4] UNESP, Disciplina Clin Integrada, Fac Odontol, Campus Aracatuba, Rua Jose Bonifacio 1193, BR-16015050 Aracatuba, SP - Brazil

• Document type: Journal article
• Source: CLINICAL ORAL INVESTIGATIONS; v. 25, n. 4 AUG 2020.
• Web of Science Citations: 0

Abstract

Objectives To evaluate the hydraulic conductance of dentin after treatment with fluoride toothpastes containing sodium trimetaphosphate microparticles (TMPmicro) or nanoparticles (TMPnano). Materials and methods The dentinal tubules of bovine dentin blocks (4 x 4 x 1 mm) were unobstructed for determination of the maximum hydraulic conductance of the dentin. The dentin blocks were randomized into four groups (n= 15/group) of toothpastes (placebo, 1100 ppm F, and 1100 with 3% TMPmicro or 3% TMPnano) which were applied for 7 days (2x/day) using a brushing machine. The dentin surface (5/group) was analyzed by scanning electron microscopy. The hydraulic conductance post-treatment was measured in the other ten blocks. Thereafter, the same blocks were immersed in citric acid (pH 3.2) for 1 min, and the conductance was determined again. The data were submitted to 2-way ANOVA repeated measures, followed by the Student-Newman-Keuls test (p< 0.05). Results The percentage conductance reduction post-treatment for the groups were placebo = 1100 ppm F < 1100 TMPnano < 1100 TMPmicro (p <0.001). After acid attack, the percentage reduction was placebo < 1100 ppm F < 1100 TMPnano < 1100 TMPmicro (p< 0.001). The toothpastes containing TMP showed the highest obliteration of dentinal tubules. Conclusions The addition of TMPmicro to fluoride toothpaste produced a greater reduction in hydraulic conductance when compared with 1100 ppm F toothpaste. (AU)

• FAPESP's process: 13/25531-9 - Evaluation of the obliteration and conductance hydraulic of the dentine tubules using sodium trimetaphosphate toothpaste: in vitro study
• Grantee: Denise Pedrini
• Support Opportunities: Regular Research Grants