Characterization of the physical and mechanical properties of a new sintered ceramic metal alloy
Date
2005
DOI
Authors
Marghalani, Thamer Y.
Version
OA Version
Citation
Abstract
Purpose: The purpose of this study was to determine the bond strength, marginal accuracy, strength under static loading, and strength under cyclic loading of SinterKor, a new sintered alloy in comparison with high noble cast alloys and another sintered alloy.
Materials and Methods: Ten discs of SinterKor, Captek, RxG and Bio 2000 alloys were made, and porcelain was applied. Discs were subjected to shear stresses, and shear load was calculated and analyzed. Ten anterior crown copings for each group were fabricated. Marginal gaps of the copings were measured under 10X magnification on the dies before porcelain application, and after porcelain application to produce full contoured crowns. Ten fixed partial dentures (FPDs) of SinterKor, Captek, and RxG alloys were fabricated, and marginal gaps were measured on each die before and after porcelain application. Four of the crowns and FPDs of each group were subjected to loads until catastrophic failure occurred. The remaining six crowns and FPDs were cyclically loaded to 100,000 cycles with 35% of the load-to-failure values.Then the specimens were loaded to catastrophic failure.
Results: Shear Bond Strength: RxG material recorded a higher shear bond strength value (56.23[plus or minus]7.07 MPa) compared with the other groups, SinterKor (39.02[plus or minus]6.00 MPa), Captek (41.96[plus or minus]13.04 MPa), and Bio 2000 (43.96[plus or minus]7.22 MPa) (P=.006). The other alloys were not different from each other.
Marginal Accuracy: For crowns, the mean marginal gap values were: Bio 2000 (95.81[plus or minus]40.48 [mega]m), SinterKor (81.21[plus or minus]47.83[mega]m), Captek (75.36[plus or minus]41.91[mega]m), and RxG (69.37[plus or minus]44[mega]m) before porcelain application. There was no significant difference among the crowns (P=.085). Mean marginal gap values, after porcelain application, were: Bio 2000 (101.59[plus or minus]39.88[mega]m), SinterKor (85.66[plus or minus]47.51[mega]m), Captek (79.51[plus or minus]42.8[mega]m), and RxG (72.69[plus or minus]43.81[mega]m). Bio 2000 material was significantly higher than RxG material (P=.040).
For initial marginal gaps for FPDs, RxG material was 44.13[plus or minus]29.72[mega]m, Captek material was 36.38[plus or minus]20.32[mega]m, and SinterKor material was 38.63[plus or minus]16.75[mega]m. RxG material was significantly higher than Captek material (P=.025).
After porcelain application, RxG material was 47.88[plus or minus]29.52[mega]m, Captek material was 40.6[plus or minus]20.26 [mega]m, and SinterKor material was 41.95[plus or minus]16.88[mega]m. Mean gaps for RxG material was significantly higher than the mean for Captek in FPDs (P=.037).
Load to Failure and Effect Cyclic Loading: For crowns, the mean load to failure for SinterKor material was 563.63[plus or minus]95.61 N. Captek material was 608.13[plus or minus]163.28 N. RxG material was 516.67[plus or minus]150.74 N. Bio 2000 material was 537.88[plus or minus]22.64 N. There was no significant difference among the alloys (P=.755). The mean load to failure for SinterKor crowns after cycling was 548.85[plus or minus]68.96 N, Captek material was 564.18[plus or minus]141.17 N, and RxG material had a value of 404.1[plus or minus]32.16 N. There was no significant difference among the alloys (P=.359).
For FPDs the mean load to failure was 753.03[plus or minus]105.54 N for SinterKor FPDs, 965.83[plus or minus]39.26 N for Captek FPDs, and 543.85[plus or minus]163.4 N for RxG FPDs. Captek FPDs were significantly stronger than RxG FPDs (P=.005). For FPDs after cycling, SinterKor FPDs had a value of 701.98[plus or minus]122.6 N, Captek FPDs had a value of 937.08[plus or minus]163 N, and RxG FPDs had a value of 581.83[plus or minus]120.85 N. Captek FPDs were significantly stronger than RxG FPDs (P=.014).
Conclusions: RxG material recorded the highest bond strength values compared with the other alloys (P=.006), while the other alloys had comparable bond strength values (P=.518). SinterKor material was comparable to casting alloys and other sintered alloys with regard to marginal accuracy (P=.085) as well as resistance static Ioading (P=.755) and cyclic loading (P=.359). Sintered alloys were more resistant to cyclic loading than cast alloys were.
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Thesis (D.Sc.D.)--Boston University, Goldman School of Dental Medicine, 2005 (Prosthodontics).
Includes bibliographical references: leaves 177-186.
Thesis (D.Sc.D.)--Boston University, Goldman School of Dental Medicine, 2005 (Prosthodontics).
Includes bibliographical references: leaves 177-186.
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This work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.