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RGO.Revista Gaúcha de Odontologia (Online)

  ISSN 1981-8637

GONCALVES, Ana Roseli de Queiroz et al. Biomechanical behavior of internal and external hex implants. RGO, Rev. gaúch. odontol. (Online) []. 2010, 58, 3, pp. 327-332. ISSN 1981-8637.

OBJECTIVE: This study used retrospective and prospective analyses to verify the biomechanical behavior of the implant/abutment interface in clinical cases of partial and single prostheses on implants, assessing the instability of the prosthetic internal and external hex components and considering the masticatory load of each patient. METHODS: This is a retrospective and prospective study of patients who attended the emergency room of the Dental Academy Graduate Center of the State of Rio de Janeiro, Clivo clinic, from November 2008 to January 2009. A total of 44 patients were seen and the occurrences were recorded by four dentists. Of these, 16 patients underwent prosthetic emergency care, loosening the screw of the prosthesis of 90 implants. RESULTS: Clinically, most (84%) of the loosening were done in women aged 49 to 69 years with external hex implants; 78% were screwed prostheses, 70.3% were splinted prostheses, 41% were in the posterior mandible and 43% were opposite to natural teeth. CONCLUSION: According to the abovementioned tests, there is a significant association between implant failure and hex types regarding the type of prosthesis and antagonist used. Many clinical and biomechanical studies and mechanical assays need to be published to allow the differences between these types of connections to be compared.

: biomechanics; dental implants; dental prosthesis.

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