You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Outcome", "Participant", "Intervention"].

Please return the output as a JSON object of the format: {"Participant" : ["patients with COPD", ...], "Intervention" : ["Atenolol", ...], "Outcome" : ["blood pressure", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Cemented CeraOne and porcelain fused to TiAdapt abutment single-implant crown restorations : a 10-year comparative follow-up study . BACKGROUND Long-term data comparing cemented and noncemented single-implant restorations has not been reported . AIM To compare clinical and radiographic performance of single-implant crown restorations made by either directly baked porcelain to custom-made TiAdapt titanium abutments ( Nobel Biocare AB , Göteborg , Sweden ) ( test ) or cement crowns onto CeraOne ( Nobel Biocare AB ) abutments ( control ) after 10 years in function . MATERIALS AND METHODS Altogether , 35 consecutive patients were provided with 41 turned single Brånemark System implants ( Nobel Biocare AB ) in the partially edentulous upper jaw . By random , 15 and 20 patients were provided with 18 test and 23 control implant crowns , respectively . Thereafter , clinical and radiographic data were collected and compared between the two groups . RESULTS None of the implants were found loose during the follow-up period ( 100 % ) . Few clinical problems were observed , and the overall average marginal bone loss was 0.26 mm ( SD 0.64 ) during 10 years in function . After the final tightening of the crowns , no significant differences were observed between the test and control groups ( p > .05 ) . The head of the implants was placed on an average 6.3 mm ( SD 2.24 ) below the cement/enamel junction of the adjacent teeth ( range 2.5-10.0 mm ) . Implants with reported mechanical and/or mucosal problems or placed more apically in relation to the adjacent teeth did not present more bone loss as compared with implants with no problems or placed more coronally , respectively ( p > .05 ) . CONCLUSIONS There seems to be no obvious clinical or radiographic differences between the test and control single-implant restorations during 10 years of follow-up . Occasionally , some restorations presented loose abutment screws and/or fistulas during follow-up . This implies a certain need for maintenance where a one-piece single-implant protocol ( test ) allows both for a simple clinical procedure at placement without cementation problems , as well as for an easy and simple maintenance of installed single implant crowns in long-term function .
{"Intervention": ["cemented", "noncemented single-implant restorations", "single-implant crown restorations", "Cemented CeraOne and porcelain fused to TiAdapt abutment single-implant crown restorations", "baked porcelain to custom-made TiAdapt titanium abutments"], "Outcome": ["clinical and", "radiographic performance"], "Participant": []}