Effects of in-office bleaching agent combined with different desensitizing agents on enamel

Abstract

Objective:To analyze color change, microhardness and chemical composition of enamel bleached with in-office bleaching agent with different desensitizing application protocols.Materials and Methods:One hundred and seventeen polished anterior human enamel surfaces were obtained and randomly divided into nine groups (n = 13). After recording initial color, microhardness and chemical composition, the bleaching treatments were performed as G1: Signal Professional White Now POWDER&LIQUID FAST 38% Hydrogen peroxide(S); G2: S+Flor Opal/0.5% fluoride ion(F); G3: S+GC Tooth Mousse/Casein Phosphopeptide-Amorphous Calcium Phosphate (CPP-ACP) paste(TM); G4: S+UltraEZ/3% potassium nitrate&0.11% fluoride(U); G5: S+Signal Professional SENSITIVE PHASE 1/30% Nano-Hydroxyapatite (n-HAP) suspension(SP); G6: S-F mixture; G7: S-TM mixture; G8: S-U mixture; G9: S-SP mixture. Color, microhardness and chemical composition measurements were repeated after 1 and 14 days. The percentage of microhardness loss (PML) was calculated 1 and 14 days after bleaching. Data were analyzed with ANOVA, Welch ANOVA, Tukey and Dunnett T3 tests (p<0.05).Results:Color change was observed in all groups. The highest ΔE was observed at G7 after 1 day, and ΔE at G8 was the highest after 14 days (p<0.05). A decrease in microhardness was observed in all groups except G6 and G7 after 1 day. The microhardness of all groups increased after 14 days in comparison with 1 day after bleaching (p>0.05). PML was observed in all groups except G6 and G7 after bleaching and none of the groups showed PML after 14 days. No significant changes were observed after bleaching at Ca and P levels and Ca/P ratios at 1 or 14 days after bleaching (p>0.05). F mass increased only in G2 and G6, 1 day after bleaching (p<0.05).Conclusions:The use of desensitizing agents containing fluoride, CPP-ACP, potassium nitrate or n-HAP after in-office bleaching or mixed in bleaching agent did not inhibit the bleaching effect. However, they all recovered microhardness of enamel 14 days after in-office bleaching.

Bleaching Stained Arrested Caries Lesions: In vivo Clinical Study

“… 27 28 29 The oxidation–reduction reaction of the bleaching agent would cause a degradation of the organic and inorganic dental matrices resulting in areas of demineralization, depressions, reduced microhardness, and increased surface roughness. 30 31 32 33 These surface changes may lead to sensitivity, plaque accumulation, and the possibility of initiating caries lesions. 29 Therefore, dental clinicians should consider using protective remineralizing agents such as fluoride, calcium, amorphous calcium phosphate, and hydroxyapatite immediately after the bleaching procedure.…”

Effect of bleaching treatment on element content of enamel

“…[39][40] This method was used to evaluate changes in enamel mineral content in our study. In the study of Kutuk and co-workers, 25 it has been shown that F containing desensitizing agents used after bleaching or in addition to bleaching gels increase the F levels in enamel. The possible explanation for this increase may be the use of F-containing bleaching agent to prevent sensitivity or demineralization during the bleaching process.…”

Tratamiento estético en fluorosis dental grado 3 según índice Thylstrup y Fejerskov, mediante métodos conservadores

“…resina compuesta y en la actualidad la aplicación de resinas infiltrantes 12,13 , y en casos severos lo más común será emplear restauraciones indirectas de recubrimiento parcial o total, tomando en cuenta el grado de pérdida de la estructura dental y en ciertos casos restauraciones directas mediante resina compuesta 14 .…”