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Published on: July 21, 2014
Polymerization shrinkage strain of interocclusal recording materials
Jung-hyun Chun1, Ahran Pae, Sung-hun Kim
1Graduate School of Dentistry, Ewha Womans University, Yangcheon-gu, Seoul, Republic of Korea.
Summary
This study measured polymerization shrinkage-strain in dental bite materials. O-Bite showed significantly lower shrinkage, while Luxabite exhibited the highest, indicating material-dependent dimensional stability.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
Background:
- Accurate interocclusal records are crucial for dental prosthetics.
- Polymerization shrinkage in recording materials can lead to inaccuracies.
Purpose of the Study:
- To investigate and quantify the polymerization shrinkage-strain of various interocclusal recording materials.
- To compare the dimensional stability of polyvinylsiloxane, polyether, and dimethacrylate-based materials.
Main Methods:
- In vitro evaluation of seven interocclusal recording materials.
- Measurement of polymerization shrinkage using the Bonded-disk method at multiple time points (1-10 min) post-mixing at 37°C.
- Statistical analysis using one-way ANOVA and Scheffé test.
Main Results:
- All tested materials exhibited polymerization shrinkage, with Luxabite showing expansion initially.
- Shrinkage-strain increased over time, with the rate diminishing gradually.
- O-Bite demonstrated significantly lower shrinkage-strain (0.16-0.18%) compared to other materials at later time points.
- Luxabite displayed the highest shrinkage-strain values (3.10-3.30%).
Conclusions:
- Interocclusal recording materials exhibit diverse polymerization shrinkage-strain kinetics.
- Significant dimensional changes occur even beyond manufacturers' indicated setting times.
- Material selection impacts the accuracy of interocclusal records due to varying shrinkage behaviors.
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