CRISTINA-ANGELA GHIORGHE*, SIMONA STOLERIU, GALINA PANCU, CLAUDIU TOPOLICEANU, <br>ANDREI VICTOR SANDU, SORIN ANDRIAN<br>Changes of the mineral structure in the enamel adjacent <br>to Three Types of restorative materials after immersion in hydrochloric acid

CRISTINA-ANGELA GHIORGHE*, SIMONA STOLERIU, GALINA PANCU, CLAUDIU TOPOLICEANU,
ANDREI VICTOR SANDU, SORIN ANDRIAN
Changes of the mineral structure in the enamel adjacent
to Three Types of restorative materials after immersion in hydrochloric acid

Abstract:

The aim of this study was to assess the changes of the mineral structure in the enamel adjacent to three restorative materials, after the immersion in 0.06 mol/L hydrochloric acid (pH = 1.2) for 30 min and 60 min. The study group included 15 molars, extracted from periodontal reasons, divided in three groups. Class I cavities were prepared and filled with three types of restorative materials: Fuji IX (GC, Japan), Fuji II LC (GC, Japan), Compomer Freedom (SDI limited, Australia). The teeth were sectioned longitudinally in buccal-oral and mesio-distal plans. Three pieces of each tooth were used as samples and were immersed in distilled water, in hydrochloric acid (0.06mol/L, pH = 1.2), for 30 and 60 min. The morphologic structure of dental sections was analyzed in SEM microscopy. The mineral content (calcium, phosphorus, oxygen ions) in the interface tooth/material area, were evaluated using EDX method. The results were analyzed using ANOVA and Bonferroni statistical tests (p £ 0.05). The mean calcium, phosphorus and oxygen ions content (wt%) significantly varied between the samples immersed in hydrochloric acid (0.06mol/L, pH = 1. 2) after 30 min and 60 min, and samples immersed in distilled water (control sample: 50.4373 for calcium; 23.0260 for phosphorus; 26.2673 for oxygen; 30 min immersion: 26.8333 for calcium, 10.8467 for phosphorus, 58.9587 for oxygen; after 60 min: 2.2420 for calcium, 1.4967 for phosphorus, 76.1913 for oxygen). The mineral structure of enamel at the interface with the tested materials undergoes significant changes, comparing with the control group, after immersion of teeth in hydrochloric acid for 30 and 60 min. Keywords: GERD, SEM, EDX, erosion, glassionomer cements

Issue: 2014, Volume 65, Issue 9

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