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Influence of ultrasound or halogen light on microleakage and hardness of enamel adjacent to glass ionomer cement
Author(s) -
GUGLIELMI CAMILA ALMEIDA BRANDÃO,
MOHANA ANICE,
HESSE DANIELA,
LENZI TATHIANE LARISSA,
BONINI GABRIELA CUNHA,
RAGGIO DANIELA PRÓCIDA
Publication year - 2012
Publication title -
international journal of paediatric dentistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.183
H-Index - 62
eISSN - 1365-263X
pISSN - 0960-7439
DOI - 10.1111/j.1365-263x.2011.01173.x
Subject(s) - glass ionomer cement , knoop hardness test , enamel paint , dentistry , medicine , penetration (warfare) , indentation hardness , halogen lamp , cement , materials science , composite material , microstructure , physics , optics , operations research , engineering
International Journal of Paediatric Dentistry 2012; 22: 110–115 Background. The use of external sources of energy may accelerate the setting rate of glass ionomer cements (GICs) allowing better initial mechanical properties. Aim. To investigate the influence of ultrasound and halogen light on the microleakage and hardness of enamel adjacent to GIC restorations, after artificial caries challenge. Design. Cavities were prepared in 60 primary canines, restored with GIC, and randomly distributed into three groups: control group (CG), light group (LG) – irradiation with a halogen light‐curing unit for 60 s, and ultrasonic group (UG) – application of ultrasonic scaler device for 15 s. All specimens were then submitted to a cariogenic challenge in a pH cycling model. Half of sample in each group were immersed in methylene blue for 4 h and sectioned for dye penetration analysis. The remaining specimens were submitted to Knoop cross‐sectional microhardness assessments, and mineral changes were calculated for adjacent enamel. Results. Data were compared using Kruskal–Wallis test and two‐way ANOVA with 5% significance. Higher dye penetration was observed for the UG ( P < 0.01). No significant mineral changes were observed between groups ( P = 0.844). Conclusion. The use of halogen light‐curing unit does not seem to interfere with the properties of GICs, whereas the use of ultrasound can affect its marginal sealing.