Objective: In the aid of simplifying the dental treatment when restoring implants, the use of the Easy abutment (Nobel BiocareTM) is one option. The Easy abutment is 5mm from the implant platform to the superior surface. Certain clinical situations might be improved by the use of shorter implant abutments especially were there is a limited occlusal clearance. The purpose of this study was to evaluate the effect of decreasing the abutment height on retention of subsequent restoration. Methods: Sixty samples were divided in 6 groups of 10 samples each. Group one: 4.3 mm implant abutment diameter with 4 mm height; Group two: 4.3 mm implant abutment diameter with 5 mm height; Group three: 5 mm implant abutment diameter with 4 mm height; Group four: 5 mm implant abutment diameter with 5 mm height; Group five: 6 mm implant abutment diameter with 4 mm height; Group six: 6 mm implant abutment diameter with 5 mm height. Each sample had a crown waxed and cast from a Type III gold alloy. Crowns were prepared and cemented to the abutment with ImprovTM provisional cement. Using an Instron Universal machine a tension force was applied until dislodgment of the crown occurred. Results: Mean removal forces were: Group one 120.67N, Group two 134.99N, Group three 100.93N, Group four 100.33N, Group five 137.48N, Group six 156.98N. A Fisher's PLSD test was done and no statistically significant difference was found between Group one and two. There was also no statistically significant difference between Groups three and four and Groups five and six. Conclusion: Removal forces were not significantly affected by different abutment heights between same implant diameter groups. Supported by NobelBiocare/University of Michigan Center for Excellence

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