Abstract
Backgrounds: The degree of microleakage is one of the main criteria in evaluating the restorative materials such as glass ionomer (GI) restoratives, which are available in two forms: loose powder and liquid form to be hand-mixed or pre-proportioned in a capsule to be mixed mechanically. Objectives: This study was conducted to compare the microleakage of encapsulated GI restoratives with their hand-mixed equivalent. Materials and Methods: In this interventional (field trial) study, 40 extracted caries-free deciduous teeth were selected. After preparing class V cavities, teeth were divided into two groups. Cavities in group one were restored with encapsulated self-cured GI restorative (EQUIA, Fuji IX). In the second group, hand-mixed GI restoratives (Fuji IX) were used, which were prepared in accordance with the manufacturers’ recommended powder to liquid mixing ratios. After thermo cycling, the samples were immersed in 0.5% methylene blue solution for 12 hours. Then, they were sectioned for examination under light microscope. Micro leakage of each restoration was evaluated by the depth scale of the dye penetration along the tooth-restoration interface. Results: Statistical analysis by Mann-Whitney U test showed no significant difference in micro leakage between encapsulated GI restoratives and their hand-mixed equivalents (P < 0.05). Conclusions: There was no difference between micro leakage of hand-mixed and encapsulated GIs and in case of following the manufacturer’s instruction and recommendations, hand-mixed GIs could be as efficient as their encapsulated equivalents.
Highlights
The search for finding an ideal restorative material is still a challenge in dentistry
A Abbreviation: GIC, glass ionomer cement. b Data are presented as %. c Scale of dye penetration according to Table 1
0c a Abbreviation: GIC, glass ionomer cement. b Data are presented as %. c Scale of dye penetration according to Table 1
Summary
The search for finding an ideal restorative material is still a challenge in dentistry. For each individual clinical situation, dentists must assess certain properties in order to find the most suitable material Such properties include biocompatibility, adhesion to the tooth structure, absence of marginal leakage, wear and pressure resistance, fluoride release, setting and working time, facilities related to its manipulation, and the cost [1]. Glass ionomer restoratives have some exclusive physical and chemical properties, which make them excellent dental restorative materials in pediatric dentistry They have cariostatic function by providing a slow release of fluoride; they are biocompatible with pulpal tissue [5], and chemically bind to enamel, dentin, and cementum, thereby reduce the need for the retentive cavity preparation, which make them suitable materials for restoring cervical lesions [5, 6]. These lesions usually have little or no enamel at the cervical margin and restorative materials come into contact with cementum or dentine [7]
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