Effect of Conditioning Protocols and Ultrasonic Application of an Infiltrant Resin in White Spot Lesions

Abstract

The aim of this study was to evaluate different conditioning protocols and sonic/ ultrasonic application of an infiltrant resin (IR) in artificial white spot lesions (AWSL). the V/L surfaces of 48 molars were induced to an AWSL and divided in 6 groups, according to the conditioning protocols and application technique: 15% hydrochloric acid (HA) + manual application of the IR; HA + 37% phosphoric acid (PA) + manual application of the IR; HA + ultrasonic application (U) of the IR; HA + sonic application (S) of the IR; PA+HA+S; and PA+HA+U. For the Penetration Depth (PD), the crowns were etched with HA for 120s. The IR Icon® (DMG) was applied according to the manufacturer`s instructions. The crowns were dye penetrated (0.1% red fluorophore rhodamine B isothiocyanate for 12h) and bleached with 30% hydrogen peroxide for 12 h. The discs were immersed in a 50% ethanol solution, containing 100 µM of sodium fluorescein. The PD (in µm) was measured using confocal laser scanning microscopy (20x). The bond strength (BS) was performed by michoshear test (0.5 mm/min). Data were submitted to 2-way ANOVA and Tukey (α=0.05). For BS, the interaction was not significant (p>0.05). For PD, the main factors were significant (application -p<0.001; conditioning technique -p=0.003). The ultrasonic application showed the highest PD values. PA+HA presented higher results than HA. The sonic/ultrasonic applications and the use of phosphoric acid prior to hydrochloric acid improved PD of the infiltrant resin. Conditioning protocols or application techniques did not influence BS values.

Effect of Resin Infiltration on Enamel: A Systematic Review and Meta-Analysis

“…In this systematic review, twenty-three articles reported information about microhardness , ten evaluated surface roughness, [27,31,37,47,[49][50][51][52][53][54], sixteen assessed the penetration depth [40,46,50,[55][56][57][58][59][60][61][62][63][64][65][66][67] and eight explored shear bond strength after resin infiltration [32,52,[68][69][70][71][72][73].…”

“…Overall, twelve studies included bovine teeth (n per group = 803) while twenty-five studies included human teeth (n per group = 865). Nine studies reported data without specimen demineralization previously to resin infiltration [47,54,55,57,59,[61][62][63][64]74] and thirty-nine articles included the demineralization process before the infiltrative resin [21,[27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][48][49][50][51][52][53]56,58,60,[65][66][67][69][70][71][72][73]. The demineralization process consists of emerging the teeth in a demineralization solution, with pH between 4 and 5 for a period of time that ranges from 1 min to 1200 h, to simulate the formation of WSLs (Table…”

The Use of Resinous Infiltrants for the Management of Incipient Carious Lesions: a Literature Review

“…The previous preparation with hydrochloric acid to 15% for 120 seconds showed better results in studies that analyzed the different pre-treatments for surfaces to be infiltrated, being recommended by the technique currently used 35 . In addition, the literature suggests that the use of ultrasonic application with the resinous infiltration can increase the depth of the material penetration in the carious lesions 36 .…”