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The fit of cast and premachined implant abutments
1Department of Restorative Dentistry and Periodontology, School of Dental Science, Trinity College, Dublin, Ireland.
Statement Of Problem:
There is insufficient information regarding the adaptation of abutments to implants.
Purpose:
This study assessed the adaptation of premachined, cast, and laboratory modified premachined abutments to implants at two sites: abutment/implant interface and screw to screw seat.
Material And Methods:
Six combinations of abutments and implants were studied: CeraOne abutments joined to Nobel Biocare implants; STR (Implant Innovations Inc.) abutments joined to 31 implants; Cast UCLA (31) abutments subjected to porcelain firing cycles and joined to 31 implants; Cast UCLA abutments subjected to porcelain firing cycles and joined to Nobel Biocare implants; UCLA premachined abutments cast with gold palladium alloy and subjected to porcelain firing cycles (later joined to 31 implants); and UCLA premachined abutments joined to 31 implants. Each group contained five assemblies.
Results:
The adaptation of abutments to implants was closer and the amounts of contact larger for assemblies with premachined and laboratory modified premachined abutments than for those with cast abutments.
Conclusion:
The finishing of custom-made abutments requires further refinement.