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Related Experiment Videos

Bacteria in cavities beneath intermediary base materials.

J Qvist, V Qvist, H Lambjerg-Hansen

    Scandinavian Journal of Dental Research
    |July 1, 1977
    PubMed
    Summary
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    Dental base materials were tested for their ability to block bacteria under fillings in primary teeth. Dycal, zinc oxide-eugenol, Dropsin, and Durelon (creamy) effectively prevented bacterial invasion, unlike other tested materials.

    Area of Science:

    • Dental Materials Science
    • Cariology
    • Pediatric Dentistry

    Background:

    • Bacterial microleakage beneath dental restorations is a significant factor in secondary caries and pulpitis.
    • Selection of appropriate intermediary base materials is crucial for preventing bacterial ingress in primary molars.

    Purpose of the Study:

    • To evaluate the efficacy of six intermediary base materials in preventing bacterial entrance beneath silicate cement fillings in vivo.
    • To compare the sealing ability of various base materials against common dental cements.

    Main Methods:

    • An in vivo study was conducted on primary molars with cavities prepared for silicate cement fillings.
    • Six different intermediary base materials (Fluoritec, Durelon solid mixed, De Trey phosphate cement solid/creamy mixed, Dycal, zinc oxide-eugenol cement, Dropsin, Durelon creamy mixed) were placed.

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  • Bacterial presence on the pulpal wall was assessed after a 1-month observation period.

    • Main Results:

    • No bacteria were detected beneath Dycal, zinc oxide-eugenol cement, Dropsin, and Durelon (creamy mixed).
    • Bacteria were found in 20% of cavities under Fluoritec and 40% under Durelon (solid mixed) or De Trey phosphate cement (solid/creamy mixed).
    • High bacterial presence was observed beneath silicate cement (90%) and silver amalgam (50%) fillings without intermediary bases.

    Conclusions:

    • Dycal, zinc oxide-eugenol cement, Dropsin, and Durelon (creamy mixed) demonstrate excellent sealing properties against bacterial microleakage in primary molars.
    • These materials provide a superior barrier compared to Fluoritec, Durelon (solid mixed), De Trey phosphate cement, silicate cement, and silver amalgam alone.
    • The choice of intermediary base material significantly impacts the prevention of bacterial contamination beneath restorations in pediatric dentistry.