• G Wu, Y Zhao, and B Wang.
• Department of Prosthodontics, College of Stomatology, Forth Military Medical University, Xi'an 710032, China.
• Zhonghua Kou Qiang Yi Xue Za Zhi. 2001 Nov 1; 36 (6): 434-6.

ObjectiveTo probe the clinical possibility of making incorporated keeper cap by high temperature casting.MethodsThe 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.ResultsThe 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).ConclusionsThe incorporated keeper could be made by using high temperature casting method instead of medium temperature one in clinic.

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