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Influence of different abutments and aesthetics materials in retention screw preload maintenance of implant-supported crowns

Grant number: 07/04181-9
Support type:Regular Research Grants
Duration: October 01, 2007 - September 30, 2009
Field of knowledge:Health Sciences - Dentistry
Principal researcher:Wirley Goncalves Assuncao
Grantee:Wirley Goncalves Assuncao
Home Institution: Faculdade de Odontologia (FOA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil


The aim of this study is to evaluate the influence of different veneeringl materials and abutments in the retention screw preload maintenance of implant-supported crowns after retightening and fatigue resistance test. Sixty single crowns will be fabricated according to the experimental groups characteristics (n=12). Metal-ceramic crowns on plastic UCLA abutments (Group I) and on gold UCLA abutments (Group II) will be fabricated . Single crowns with metal and ceromer on plastic UCLA abutments (Group III) and on gold UCLA abutments (Group IV) will be fabricated too. In group V, all-ceramic crowns will be fabricated on abutments obtained trough Procera system. All the crowns will be connected to implants with gold squared retention screws torqued to 30Ncm and submitted to fatigue resistance test. The machine will be paused at each 100.000 cycles to measure the preload and to retighten the retention screw until complete 1.000.000 cycles. Each experimental group will have a control group represented by a preload measurement before the fatigue test at each crown. Data will be submitted to statistic analyses after the experimental phase. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DELBEN, JULIANA APARECIDA; GOMES, ERICA ALVES; RICARDO BARAO, VALENTIM ADELINO; ASSUNCAO, WIRLEY GONCALVES. Evaluation of the Effect of Retightening and Mechanical Cycling on Preload Maintenance of Retention Screws. INTERNATIONAL JOURNAL OF ORAL & MAXILLOFACIAL IMPLANTS, v. 26, n. 2, p. 251-256, . (07/04181-9, 07/53140-3)
ASSUNCAO, WIRLEY GONCALVES; DELBEN, JULIANA APARECIDA; TABATA, LUCAS FERNANDO; RICARDO BARAO, VALENTIM ADELINO; GOMES, ERICA ALVES. Effect of Vertical Misfit on Screw Joint Stability of Implant-Supported Crowns. Journal of Materials Engineering and Performance, v. 20, n. 6, p. 947-951, . (07/04181-9, 07/53140-3)
DELBEN, JULIANA APARECIDA; RICARDO BARAO, VALENTIM ADELINO; DOS SANTOS, PAULO HENRIQUE; ASSUNCAO, WIRLEY GONCALVES. Influence of Abutment Type and Esthetic Veneering on Preload Maintenance of Abutment Screw of Implant-Supported Crowns. JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY, v. 23, n. 2, p. 134-139, . (07/04181-9, 07/53140-3)

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