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Restorative resins: abrasion vs. mechanical properties
Scandinavian Journal of Dental Research
|December 1, 1980
Summary
Simple lab tests can predict food abrasion on dental fillings. Wallace hardness testing effectively measures wear on smooth resins, while filler particles in rough resins present a dual abrasion effect.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Class 1 restorative resins are susceptible to abrasion from food particles.
- Evaluating resin abrasion resistance is crucial for clinical longevity.
- Existing laboratory tests may not accurately simulate in-vivo abrasion conditions.
Purpose of the Study:
- To determine if simple laboratory tests can reliably assess food abrasion of Class 1 restorative resins.
- To identify key parameters influencing resin abrasion by food.
Main Methods:
- Evaluation of smooth-surface resins (micro-filled composite, unfilled resins) using the Wallace hardness test.
- Assessment of abrasion based on Vickers diamond penetration depth.
- Analysis of rough-surface resins (conventional composites) considering filler particle effects.
Main Results:
- Wallace hardness test is a valid predictor of abrasion for smooth-surface resins; deeper penetration indicates more severe abrasion.
- Abrasion mechanism for smooth-surface resins is primarily scratching; porosity significantly increases wear.
- Filler particles in rough-surface resins offer initial protection but increase surface roughness and friction over time, leading to enhanced abrasion.
Conclusions:
- Simple laboratory tests, specifically the Wallace hardness test, can effectively evaluate food abrasion on Class 1 restorative resins.
- Resin porosity and filler particle characteristics significantly influence abrasion resistance.
- Findings provide insights for developing improved restorative resin formulations to enhance durability against food abrasion.