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Microleakage between endodontic temporary restorative materials placed at different times
1Department of Restorative Dentistry, Veterans General Hospital-Taipei, Taiwan, Republic of China.
Journal of Endodontics
|October 26, 1999
Summary
This study found that microleakage is less common between sequential dental restorative materials than between a primary restoration and the tooth cavity wall. This is important for understanding the longevity of dental restorations.
Area of Science:
- Restorative Dentistry
- Endodontics
- Dental Materials Science
Background:
- Occlusal endodontic access preparations are sometimes performed without removing existing restorations.
- Microleakage between sequentially placed restorative materials is not well-understood.
Purpose of the Study:
- To compare microleakage at interfaces involving primary and secondary restorative materials placed at different times.
- To evaluate microleakage between restorative materials and cavity walls.
Main Methods:
- 120 human molars underwent endodontic access preparations and primary restorations (IRM or amalgam).
- Secondary restorations (IRM, Caviton, or IRM/Caviton) were placed after 14 days in half the samples.
- Microleakage was assessed using dye penetration after thermal cycling and sectioning.
Main Results:
- Significantly less microleakage occurred between primary and secondary restorative materials compared to between primary restorations and cavity walls.
- This finding held true regardless of whether IRM or amalgam was used as the primary material.
Conclusions:
- Sequential placement of restorative materials may offer a better seal than the interface between a primary restoration and the tooth.
- Understanding these interfaces is crucial for improving the durability of endodontically treated teeth with existing restorations.