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Fatigue behavior of the zinc-phosphate cement layer
J Yamashita1, K Takakuda, I Shiozawa
1Department of Prosthodontics, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, Texas 78284, USA.
The International Journal of Prosthodontics
|February 24, 2001
Summary
This study investigated the fatigue behavior of zinc-phosphate cement in dental restorations. Repetitive loading did not cause fatigue fracture and may enhance stress transmission in the cement film.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Mechanical Engineering
Background:
- Understanding the mechanical properties of luting cements is crucial for dental restoration longevity.
- Zinc-phosphate cement is a commonly used luting agent for fixed partial dentures (FPDs).
- The fatigue behavior of the cement film under cyclic loading is not fully understood.
Purpose of the Study:
- To investigate the fatigue behavior of zinc-phosphate cement films.
- To evaluate the mechanical properties of the cement under cyclic loading conditions.
- To understand the influence of surface features (grooves) on cement fatigue.
Main Methods:
- Fabricated 56 brass dies (half grooved, half smooth) for FPD models.
- Cast FPDs in Au-Pd-Ag alloy and cemented them to dies using zinc-phosphate cement.
- Applied cyclic loads (50 N or 100 N) for 5.5 x 10^5 cycles in water, measuring strain and ultimate tensile strength.
Main Results:
- Strain responses remained consistent throughout the 50-N fatigue test, regardless of die grooves.
- In the 100-N test, strain responses changed over time for non-grooved dies but not for grooved dies.
- No significant differences in tensile strength were observed post-fatigue testing.
Conclusions:
- Zinc-phosphate cement films did not exhibit fatigue fracture after repetitive loading.
- Cyclic loading may potentially enhance stress transmission within the cement film.
- The presence of grooves on dies may stabilize strain response under higher cyclic loads.
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