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Microleakage of two new dentinal bonding systems
J G Fitchie1, G W Reeves, A R Scarbrough
1University of Mississippi, School of Dentistry, Jackson 39216.
Quintessence International (Berlin, Germany : 1985)
|September 1, 1990
Summary
Class V restorations using new composite resins and dentinal bonding systems showed increased microleakage compared to glass-ionomer cement. This indicates potential issues with sealing effectiveness in dentin or cementum margins over time.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials
Background:
- Class V abrasion and erosion lesions pose challenges for restoration longevity.
- Composite resin restorations at the gingival margin, often in cementum/dentin, are prone to microleakage.
Purpose of the Study:
- To compare the in vitro microleakage of two novel dentinal bonding systems with composite resins.
- To evaluate the sealing efficacy of new bonding agents against positive and negative controls.
Main Methods:
- Extracted human teeth were used for in vitro evaluation.
- A calcium-45 radioisotope technique assessed microleakage.
- Leakage was measured at 1 week, 6 months, and 1 year intervals.
Main Results:
- All tested new dentinal bonding systems and composite resins exhibited higher microleakage.
- Leakage was consistently observed across all time points (1 week, 6 months, 1 year).
- Glass-ionomer cement (negative control) demonstrated significantly less microleakage.
Conclusions:
- New dentinal bonding systems with composite resins may offer suboptimal marginal seal in Class V cavities.
- Further research is needed to improve the microleakage resistance of these restorative materials at dentin/cementum margins.