***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: The aim of this research was to compare the accuracy outcomes of open- and closed-tray implant impressions for partially edentulous patients . Eleven partially edentulous spaces in seven patients with two existing implants for fixed partial dentures were included . Group I ( closed-tray ) and group II ( open-tray ) were compared using microcomputed tomography scanning . No statistically significant differences were found between the closed- and open-tray techniques ( P = .317 ) . The subjective evaluation of patient comfort showed no differences with either impression technique . There were no differences seen between open- and closed-tray impression techniques in partially edentulous patients when implants had less than 10 degrees of angulation 
    Output:
    
The most accurate results were achieved with two configurations : ( 1 ) the optical intraoral system with powder and ( 2 ) the open technique with splinted squared transfer copings , using polyether as impression material