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Luting cement-metal surface physicochemical interactions on film thickness
1Department of Restorative Dentistry, Loma Linda University, School of Dentistry.
The Journal of Prosthetic Dentistry
|August 1, 1994
Summary
Dental cement film thickness is crucial for restorations. This study found cement type significantly impacts thickness more than metal type, with glass ionomer cements performing best. ADA specifications may not reflect real-world use.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Prosthodontics
Background:
- Clinical success of cemented dental castings relies on achieving minimal film thickness for luting agents.
- Understanding the interaction between luting agents and dental alloys is essential for optimizing cement film thickness.
- Existing American Dental Association (ADA) specifications may not fully represent clinical conditions for cement film thickness evaluation.
Purpose of the Study:
- To investigate the influence of luting agent-metal surface interactions on the film thickness of various dental cements.
- To compare the film thickness of different cement types when in contact with different dental alloys.
- To evaluate the relevance of ADA specifications for cement film thickness under simulated clinical conditions.
Main Methods:
- Evaluated five luting agents (zinc phosphate, polycarboxylate, glass ionomer, glass ionomer-composite hybrid, resinous) against three alloy types (gold, noble ceramic, base metal ceramic).
- Compared film thickness between glass-only (control) and glass-metal (test) interfaces, following ADA specifications 8, 61, and 66.
- Utilized two-way analysis of variance (ANOVA) and follow-up tests to analyze the data.
Main Results:
- Both cement type and metal surface type, along with their interaction, significantly affected cement film thickness (p < 0.0001).
- The type of cement exerted a greater influence on film thickness than the type of metal alloy.
- Glass ionomer cement exhibited lower overall film thicknesses compared to other cement types.
- Noble metal ceramic alloys resulted in lower overall film thicknesses than other tested metal types.
Conclusions:
- Luting agent-cement type is a primary determinant of film thickness, more so than the specific metal alloy used.
- Glass ionomer cements and noble metal ceramic alloys show potential for achieving thinner films, which is clinically advantageous.
- Current ADA specifications for cement film thickness may not accurately predict performance in typical clinical scenarios involving metal substrates.