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Correlation between the amount of linear polymerization shrinkage and cuspal deflection
1Department of Conservative Dentistry, Yonsei University, Seoul, Korea.
Operative Dentistry
|June 29, 2006
Summary
Polymerization shrinkage in dental composites and compomers strongly correlates with cuspal deflection, a key factor in tooth restoration integrity. Understanding this relationship aids in selecting materials to minimize stress on teeth.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Dental restorative materials like resin composites and compomers undergo polymerization shrinkage.
- This shrinkage can induce stress, leading to cuspal deflection in teeth.
- Understanding the relationship between shrinkage and deflection is crucial for material selection and clinical success.
Purpose of the Study:
- To evaluate the correlation between linear polymerization shrinkage and cuspal deflection.
- To compare these properties across various resin composites and polyacid modified resin composites (compomers).
- To identify materials with lower shrinkage and deflection for improved dental restorations.
Main Methods:
- Eight dental materials (Dyract AP, Compoglass F, Z100, SureFil, Pyramid, Synergy Compact, Heliomolar, Heliomolar HB) were tested.
- Linear polymerization shrinkage was measured using a custom linometer over 60 seconds.
- Cuspal deflection was measured in extracted premolars with standardized MOD cavities filled with the materials.
Main Results:
- Significant differences in both polymerization shrinkage and cuspal deflection were observed among the tested materials (p < 0.05).
- Heliomolar and SureFil exhibited the least polymerization shrinkage, while Pyramid and Compoglass F showed the most.
- Z100 and Heliomolar demonstrated the least cuspal deflection, with Pyramid and Dyract AP showing the most.
- A strong positive correlation was found between polymerization shrinkage and cuspal deflection (p < 0.001).
Conclusions:
- The amount of polymerization shrinkage is highly correlated with the degree of cuspal deflection in dental restorative materials.
- Material selection should consider both polymerization shrinkage and cuspal deflection to minimize stress on tooth structure.
- This correlation provides valuable insights for developing improved dental composites and compomers with reduced adverse effects.