Streptococcus mutans-induced secondary caries adjacent to glass ionomer cement, composite resin and amalgam restorations in vitro.
The aim of this study was to define, in vitro, the potential to inhibit secondary caries of restorative materials currently used in dental practice. Standard cavities were prepared on the buccal and lingual surfaces of fifty extracted human third molars. The teeth were randomly divided into five groups, each one restored with one of the following materials: glass ionomer cement (GIC); amalgam; light-cured composite resin; ion-releasing composite; and light-cured, fluoride-containing composite resin. The teeth were thermocycled, sterilized with gamma irradiation, exposed to a cariogenic challenge using a bacterial system using Streptococcus mutans, and then prepared for microscopic observation. The following parameters were measured in each lesion formed: extension, depth, and caries inhibition area. The outer lesions developed showed an intact surface layer and had a rectangular shape. Wall lesions were not observed inside the cavities. After Analysis of Variance and Component of Variance Models Analysis, it was observed that the GIC group had the smallest lesions and the greatest number of caries inhibition areas. The lesions developed around Amalgam and Ariston pHc restorations had an intermediate size and the largest lesions were observed around Z-100 and Heliomolar restorations. It may be concluded that the restorative materials GIC, amalgam and ion-releasing composites may reduce secondary caries formation.
Department of Operative Dentistry, School of Dentistry, University of São Paulo, Brazil.
Adriana
A
Gama-Teixeira
Maria Regina Lorenzeti
MR
Simionato
Silvia Nagib
SN
Elian
Maria Angela Pita
MA
Sobral
Maria Aparecida Alves de Cerqueira
MA
Luz
D000704:Analysis of Variance; D002327:Cariostatic Agents / Q000737:chemistry* / Q000627:therapeutic use; D003188:Composite Resins / Q000737:chemistry* / Q000627:therapeutic use; D016001:Confidence Intervals; D003731:Dental Caries / Q000382:microbiology* / Q000517:prevention & control; D003743:Dental Enamel / Q000187:drug effects / Q000648:ultrastructure; D003793:Dental Restoration, Permanent; D005899:Glass Ionomer Cements; D006801:Humans; D008422:Materials Testing; D008859:Microscopy, Polarization; D019279:Resin Cements / Q000737:chemistry* / Q000627:therapeutic use; D013295:Streptococcus mutans; D013499:Surface Properties
D002327:Cariostatic Agents; D003188:Composite Resins; D005899:Glass Ionomer Cements; D019279:Resin Cements