Retrospective analysis of the influence of abutment structure design on the success of implant unit. A 3-year controlled follow-up study

A comparative study of 96 Spline and Threadloc implants is presented. The authors examined the possibility of the failure of the retaining screws of two different antirotational systems (the Threadloc system with hexagonal polyhedral extension and the Spline system), and the possible incorrect link...

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Bibliographic Details
Published in:Clinical oral implants research 2001-08, Vol.12 (4), p.319-324
Main Authors: Bambini, F, Lo Muzio, L, Procaccini, M
Format: Article
Language:English
Subjects:
Adult
Aged
Dental Abutments
Dental Implantation, Endosseous
Dental Implants
Dental Prosthesis Design
Dental Prosthesis Retention - instrumentation
Dental Restoration Failure
Dentistry
Female
Follow-Up Studies
Humans
Male
Middle Aged
Retrospective Studies
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Summary:A comparative study of 96 Spline and Threadloc implants is presented. The authors examined the possibility of the failure of the retaining screws of two different antirotational systems (the Threadloc system with hexagonal polyhedral extension and the Spline system), and the possible incorrect link between the abutment and the transfer. After an observation period of 36 months starting from the day of prosthesis insertion, three single Threadloc fixtures (20%) and five pairs of joint Threadloc fixtures (5.7%) presented problems and a partial prosthetic screw loosening. For the Spline series fixtures, no screw loosening was encountered. Regarding the safety of the link between abutment and implant, the best results were obtained from the Spline system, which did not hinder the dentist in positioning the link with the abutment. This is the result of the different geometries of the two antirotational mechanisms which are present on the two fixtures. It is believed that the precise contact between the abutment and the fixture avoids the triggering of a phlogistic process, which can develop into periimplantitis. Therefore, when hex systems are used, an x-ray, which verifies this correct situation, is always recommended during the follow-up.
ISSN:0905-7161
1600-0501
DOI:10.1034/j.1600-0501.2001.012004319.x