Observations on Etched Enamel in Non-Erupted Deciduous Molars: A Scanning Electron Microscopic Study

Abstract

Under the scanning electron microscope, the characteristics of the buccal surface enamel of human non-erupted deciduous molars were evaluated after using 15, 30, and 45 seconds of phosphoric acid etching time. The teeth were extracted, kept in a 70% alcohol solution and later dehydrated and metallized for analysis with the scanning electron microscope JEOL, JSM-6.100. The in vitro experiment with 35% phosphoric acid revealed that there is a tendency of predominance of interprismatic enamel dissolution or type II pattern with 15 and 45 seconds etching time. The dissolution of the interprismatic enamel was more pronounced when an acid etching time of 45 seconds was used. The enamel surface demonstrated type I and type II patterns when acid etching time was 30 seconds

Microstructural analysis of demineralized primary enamel after in vitro toothbrushing

“…In fact, Costa et al 4 (1998) reported a random distribution of demineralization patterns in unerupted deciduous teeth etched with 35% phosphoric acid. However, Fava et al 7 (1997), using the same technique, though with a larger number of samples, found a slightly greater prevalence of type II demineralization, which is in agreement with our findings.…”

Enamel Conditioning Effect on Hybridisation of Resin Modiffied Glass Ionomer-Based into Preventive Sealing

“…In other situations, the maximum demineralization is in peripheral interprismatic areas with the center of the prism integral [35]. Also, in cases where both types of demineralization coexist, an irregular amorphous relief is obtained after conditioning with 37% orthophosphoric acid for 15 seconds [35,36].…”

“…For young people, where the interprismatic organic substance is more resistant to acid attack, it is well represented, like enamel rich in acid-resistant fluorapatite crystals, the relief obtained after conditioning acid will be less retentive and irregular. [35][36][37].…”

"Avaliação da resistência adesiva e do padrão de condicionamento da dentina e do esmalte após a aplicação do ácido bórico a 2%".

“…Quinze espécimes foram testados para cada solução ácida. O autor utilizou um grupo controle onde a superfície do esmalte não foi condicionada com soluções ácidas, apenas polida com , em 1980, avaliaram a resistência adesiva de sistemas adesivos ao esmalte empregando diferentes concentrações de ácido fosfórico(10,20,30,40,50, 60 e 70% w/w%). Setenta incisivos centrais humanos foram utilizados para o estudo.…”