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Microleakage of three cement bases.
1University of Michigan, School of Dentistry, Department of Restorative Dentistry, Ann Arbor 48109-1078.
Journal of Dental Research
|January 1, 1991
Summary
Glass-ionomer cement bases effectively minimize bacterial penetration at the tooth interface compared to conventional materials. This dental material shows promise in preventing microleakage in restorations.
Area of Science:
- Dental Materials Science
- Microbiology
- Restorative Dentistry
Background:
- Bacterial microleakage at the tooth-material interface is a significant concern in dental restorations.
- Conventional cement bases may not adequately prevent microbial ingress, potentially leading to secondary caries and restoration failure.
Purpose of the Study:
- To evaluate the efficacy of a glass-ionomer (GI) cement base in preventing bacterial penetration along the dentin interface.
- To compare the performance of GI cement base against zinc oxide-eugenol (ZOE) and varnish + zinc phosphate (V + ZP) cement bases.
Main Methods:
- 107 Class 5 restorations were placed in Rhesus monkey teeth using ZOE, V + ZP, or GI as base materials, with resin composite as the final restoration.
- Bacterial penetration was assessed by cultivating filter-paper disks retrieved from the dentin interface after 5 and 16 weeks.
Main Results:
- After 5 weeks, bacterial growth was observed in composite-only controls and the V + ZP group.
- After 16 weeks, bacterial growth was significantly reduced in the GI and ZOE groups, with only one positive sample in each.
Conclusions:
- Glass-ionomer cement bases demonstrate a superior ability to minimize bacterial penetration at the material-tooth interface compared to V + ZP.
- GI cement bases show potential as an effective material for preventing microleakage and enhancing the longevity of dental restorations.