The fit of cast and premachined implant abutments.
BACKGROUND
There is insufficient information regarding the adaptation of abutments to implants.


OBJECTIVE
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.


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.


CONCLUSIONS
The finishing of custom-made abutments requires further refinement.
Byrne
D
D
Department of Restorative Dentistry and Periodontology, School of Dental Science, Trinity College, Dublin, Ireland.
Houston
F
F
Cleary
R
R
Claffey
N
N
D000704:Analysis of Variance; D000044:Dental Abutments; D003735:Dental Casting Technique; D015921:Dental Implants; D003775:Dental Polishing; D003776:Dental Porcelain / Q000737:chemistry; D017267:Dental Prosthesis Design; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D016876:Metal Ceramic Alloys / Q000737:chemistry; D010165:Palladium / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry; D013499:Surface Properties
D015921:Dental Implants; D006047:Gold Alloys; D016876:Metal Ceramic Alloys; D012117:Resins, Synthetic; D003776:Dental Porcelain; D010165:Palladium