Effect of an acid diet allied to sonic toothbrushing on root dentin permeability: an in vitro study

Abstract

This study quantified alterations in root dentin permeability after exposure to different acid beverages. Twenty-five third molars were sectioned below the cementoenamel junction, the root segment was collected, and the pulp tissue was removed. The root segments were connected to a hydraulic pressure apparatus to measure the permeability of root dentin after the following sequential steps, with 5 specimens in each: 1) phosphoric acid etching for 30 s (maximum permeability), 2) root planning to create new smear layer, 3) exposure to different acid substances for 5 min (orange, cola drink, vinegar, white wine, lemon juice), 4) toothbrushing with sonic toothbrush for 3 min, 5) toothbrushing with sonic toothbrush plus dentifrice for 3 min. Considering step I as 100%, the data were converted into percentage and each specimen was its own control. Data were analyzed statistically by Kruskal-Wallis and Dunn's post test at 5% significance level. All acidic substances increased dentin permeability significantly after scraping (p<0.05). Toothbrushing after exposure to acid substances decreased dentin permeability and the association with dentifrice accentuated the decrease (p<0.05), except for the specimens treated with cola drink. Thus, it may be concluded that all tested acid fruit juices increased dentin permeability, and toothbrushing with or without dentifrice can decrease root dentin permeability after dentin exposure to acid diet.

Effect of Fruit Juices and Other Beverages on Loss of Tooth Structure

“…The lower pH of drinks is a significant contributing factor to erosion [22], however, some authors have demonstrated that dental erosion can be initiated at even higher pH levels [23]. A previous study showed that the low pH of the drinks affected the smear layer and caused significant erosion on application of friction post exposure [24].…”

Avaliação in vitro do efeito de soluções de vinagre sobre a microdureza da dentina radicular

“…Vinegars are composed by acetic acid (about 5% in concentration) [14]. Some studies have shown that vinegars are able to remove smear layer and open dentinal tubules, increasing the permeability and decrease the microhardnesss of the most superficial root canal dentin layer [10,14,15].…”

“…Some studies have shown that vinegars are able to remove smear layer and open dentinal tubules, increasing the permeability and decrease the microhardnesss of the most superficial root canal dentin layer [10,14,15]. Zandim et al [15] observed in vitro that alcohol, apple, rice, white wine and balsamic vinegar were able to remove smear layer and exposure of dentinal tubules, of these, the balsamic vinegar was associated with less removal of smear layer.…”

Influência dos tratamentos dessensibilizantes associados ao laser de diodo na permeabilidade dentinária

“…Uma vez expostos ao meio bucal, esses tecidos estão mais suscetíveis à erosão intrínseca ou extrínseca (alimentos e bebidas ácidas) e também à abrasão causada pela escovação, processos esses capazes de expor e abrir os túbulos dentinários (KUROIWA, 1994;WATSON;THOMPSON, 2010). A literatura demonstra que existe uma relação direta entre túbulos dentinários abertos, permeabilidade e hipersensibilidade dentinária, ou seja, quanto maior a permeabilidade, maior a hipersensibilidade clínica (PINTO et al, 2010).…”