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[The influence of two different casting temperatures on properties of the incorporated keeper]
1Department of Prosthodontics, College of Stomatology, Forth Military Medical University, Xi'an 710032, China.
Objective:
To probe the clinical possibility of making incorporated keeper cap by high temperature casting.
Methods:
The incorporated keepers were equally divided into two groups, and cast by applying medium and high temperatures respectively. The two groups were compared with the following items: the morphological changes and thickness of keeper's oxide film, the combining quality between keeper and alloy, and the magnetic retention force.
Results:
The two different casting temperatures had the similar influence on the keeper's properties, such as the keeper's metallographical view, magnetic force (medium temperature casting group: 433.6 g; high temperature casting group: 433.8 g), and combining quality with alloy, except for the morphology and thickness of the keeper's oxide film. The oxide films of the high temperature casting group (surface: 7.59 microns combining surface of keeper and alloy: 6.17 microns) were thicker than those of the medium temperature casting group (surface: 4.65 microns; combining surface of keeper and alloy: 3.95 microns).
Conclusions:
The incorporated keeper could be made by using high temperature casting method instead of medium temperature one in clinic.