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In vivo disintegration of four different luting agents.
Deniz Gemalmaz1, Cornelis H Pameijer, Mark Latta
1Department of Prosthetic Dentistry, School of Dentistry, Marmara University, 34726 Istanbul, Turkey.
International Journal of Dentistry
|October 19, 2011
Summary
Zinc phosphate cement showed the most disintegration in vivo, unlike glass ionomer and resin cements. Intraoral erosion behavior of glass ionomer cement matched resin-based cements, differing from lab findings.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Clinical Dentistry
Background:
- Luting agents are crucial for dental restorations.
- Understanding their long-term intraoral stability is essential.
- Previous studies often rely on laboratory conditions, which may not reflect clinical reality.
Purpose of the Study:
- To evaluate the in vivo disintegration of four luting agents.
- To compare the intraoral erosion of zinc phosphate, glass ionomer, resin-modified glass ionomer, and resin cements.
- To assess the influence of time on luting agent degradation under clinical conditions.
Main Methods:
- An intraoral sample holder was used in 12 patients.
- Four luting agents (zinc phosphate, glass ionomer, resin-modified glass ionomer, resin cement) were tested.
- Epoxy replicas were made from impressions taken over 18 months and scanned to calculate volume loss.
Main Results:
- Zinc phosphate cement exhibited the highest mean volume loss.
- Glass ionomer, resin-modified glass ionomer, and resin cements showed similar, significantly lower volume loss compared to zinc phosphate.
- Both cement type and duration significantly impacted volume loss (P < 0.001).
Conclusions:
- Zinc phosphate cement demonstrates the least intraoral stability among the tested luting agents.
- Glass ionomer and resin-based cements exhibit comparable in vivo disintegration.
- Intraoral conditions lead to erosion behavior in glass ionomer cements similar to resin-based cements, contrasting with laboratory findings.
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