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Increased wall-to-wall curing contraction in thin bonded resin layers.
A J Feilzer1, A J De Gee, C L Davidson
1University of Amsterdam, Department of Dental Materials Science, The Netherlands.
Journal of Dental Research
|January 1, 1989
Summary
Wall-to-wall (WTW) polymerization contraction in dental resins increases as the distance between bonded surfaces decreases. This shrinkage can reach nearly three times the linear polymerization shrinkage, impacting material performance.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Polymerization shrinkage is a critical factor in dental restorative materials.
- Understanding shrinkage behavior under different conditions is essential for material development.
Purpose of the Study:
- To investigate the relationship between wall-to-wall (WTW) polymerization contraction and WTW distance in dental resins.
- To quantify the effect of distance on shrinkage for both chemically and photo-initiated resins.
Main Methods:
- Resins (filled and unfilled, chemically and photo-initiated) were subjected to polymerization.
- Resins were bonded between two opposing disks in a custom experimental setup.
- Axial displacement (WTW contraction) was continuously measured during polymerization.
Main Results:
- WTW polymerization contraction demonstrated a direct correlation with decreasing WTW distance.
- Shrinkage values increased significantly as the distance between bonded surfaces was reduced.
- Maximum WTW contraction approached almost three times the linear polymerization shrinkage.
Conclusions:
- The distance between bonded surfaces significantly influences polymerization contraction in dental resins.
- Minimizing WTW distance amplifies polymerization shrinkage, potentially leading to adverse clinical effects.
- These findings highlight the importance of considering geometric factors in resin-based material applications.