Evaluation of different finish line designs in base metal alloys
This investigation was performed according to the widespread application of base metal alloys"nand few articles published about the marginal integrity of restorations fabricated by these metals."nThree standard dies of a maxillary first premolar were prepared with a flat shoulder finish li...
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| Main Authors: | , |
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| Format: | Book |
| Published: |
Tehran University of Medical Sciences,
1999-06-01T00:00:00Z.
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| Summary: | This investigation was performed according to the widespread application of base metal alloys"nand few articles published about the marginal integrity of restorations fabricated by these metals."nThree standard dies of a maxillary first premolar were prepared with a flat shoulder finish line in buccal"naspect and chamfer in palatal. One of them left with no change. On the buccal aspect of the second and"nthird dies 135?and 1607 bevel were added respectively"nUsing dual wax technique, nine wax patterns were formed on each die and casting procedure of selected"nnon precious alloy was performed by centrifugal method. Marginal gaps of each copping seated on dies"nwere measured by scanning electron microscope (SEM) with X500 magnification. Measurements were"ndone on three areas of marked dies on buccal aspect. Measurement son palatal aspect was done on"nmarked midpalatal point as control."nResults and statistical analysis showed no significant difference among marginal gaps in lingual aspect."nBut on the buccal aspect there were statistically significant differences among the groups (P<0.001). Flat"nshoulder had the best marginal integrity (mean 4 micron). Shoulder with 160' bevel had the most marginal"ngap (mean 26.5 micron) and shoulder with 1357 bevel was between two other groups (mean 15.7 micron). |
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| Item Description: | 1024-641X 2008-2444 |