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Pediatr Dent ; 33(7): 501-4, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-22353410

RESUMO

PURPOSE: This study's purpose was to compare the ability of 5 luting cements to reduce microleakage at stainless steel crown (SSC) margins on primary molar teeth. METHODS: Standard preparations were performed on 100 extracted primary molar teeth for SSC restoration. After fitting SSCs, samples were randomly divided into 5 groups of 20 teeth each, which were cemented with nonadhesive cement consisting of polycarboxylate (PC) or zinc phosphate (ZP), or with adhesive cement consisting of glass ionomer (GIC), resin-modified glass ionomer cement (RMGIC), or RMGIC with a bonding agent (RMGIC+DBA). After aging and thermocycling, the specimens were placed in 1% methylene blue, sectioned, and evaluated under a digital microscope. The data were compared between groups with the t test, analysis of variance, and the least significant difference test. RESULTS: Microleakage with adhesive cements was significantly lower than with nonadhesive cements (P<.05). Differences between cements were statistically significant at P<.001. RMGIC+DBA showed the lowest microleakage, followed in increasing order by RMGIC, GIC, and ZP. The PC cement showed the greatest microleakage. CONCLUSIONS: Adhesive cements were more effective in reducing microleakage in stainless steel crowns than nonadhesive cements. Use of a bonding agent with a resin-modified glass ionomer cement yielded better results than using the latter alone.


Assuntos
Coroas , Ligas Dentárias/química , Colagem Dentária , Cimentos Dentários/química , Infiltração Dentária/classificação , Aço Inoxidável/química , Cimentação/métodos , Corantes , Adaptação Marginal Dentária , Adesivos Dentinários/química , Cimentos de Ionômeros de Vidro/química , Humanos , Teste de Materiais , Azul de Metileno , Dente Molar/patologia , Cimento de Policarboxilato/química , Cimentos de Resina/química , Temperatura , Fatores de Tempo , Preparo Prostodôntico do Dente/métodos , Dente Decíduo/patologia , Cimento de Fosfato de Zinco/química
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