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Screw preloads and ...
Screw preloads and measurements of surface roughness in screw joints: an in vitro study on implant frameworks
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- Örtorp, Anders, 1964 (författare)
- Gothenburg University,Göteborgs universitet,Odontologiska institutionen,Institute of Odontology
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- Jemt, Torsten, 1950 (författare)
- Gothenburg University,Göteborgs universitet,Odontologiska institutionen,Institute of Odontology
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- Wennerberg, Ann, 1955 (författare)
- Gothenburg University,Göteborgs universitet,Odontologiska institutionen, Avdelningen för oral protetik/odontologisk materialvetenskap,Institute of Odontology, Department of Prosthetic Dentistry/Dental Technology
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visa fler...
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Berggren, Carina (författare)
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- Brycke, Mattias (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för de kirurgiska disciplinerna,Institute of Surgical Sciences
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visa färre...
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(creator_code:org_t)
- 2005
- 2005
- Engelska.
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Ingår i: Clinical implant dentistry and related research. - 1523-0899. ; 7:3, s. 141-149
- Relaterad länk:
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https://gup.ub.gu.se...
Abstract
Ämnesord
Stäng
- BACKGROUND: With the development of milled titanium implant frameworks, new surfaces that have not previously been studied are now being used in screw joints. PURPOSE: The aims of the present study were to compare the preload produced in screw-retained titanium and gold alloy frameworks and the preload for titanium frameworks before and after the application of veneers. Another aim was to try to relate the surface roughness of the screw joints to variations in preload. MATERIALS AND METHODS: Ten identical titanium and five gold alloy frameworks were fabricated. The gold screws were tightened to 10 Ncm. Preload measurements were made for the gold alloy frameworks and before and after the porcelain or acrylic resin veneers had been applied to the titanium frameworks. Surface roughness measurements were made after preload measurements on the screw joint surfaces of the titanium frameworks and corresponding gold screws. RESULTS: The preloads for the titanium and gold alloy frameworks were similar. Preload in both types of frameworks decreased after repeated torques (p<.05-.01) but was unaffected by the application of veneering materials to the titanium frameworks (p>.05). No relationship (p>.05) between preload and surface roughness characteristics was observed. Loaded titanium framework screw sites, however, had lower mean S(a) values than unloaded sites (p<.001), whereas the surfaces of loaded gold screws had higher mean S(a) values compared with the surfaces of control gold screws (p<.05-.001). CONCLUSION: When using gold screws, milled titanium frameworks have preloads similar to those of gold alloy frameworks and preloads for both decrease after repeated tightening. The preload was similar before and after the veneering of the titanium frameworks. Unloaded milled titanium screw sites had rougher surfaces than loaded, and loaded gold screws had rougher surfaces than unloaded. However, no correlation between screw joint surface and preload was observed for veneered titanium frameworks.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Odontologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Dentistry (hsv//eng)
Nyckelord
- Computer-Aided Design
- Dental Abutments
- *Dental Alloys
- Dental Implantation
- Endosseous
- *Dental Implants
- *Dental Prosthesis Design
- Dental Prosthesis Retention/*instrumentation
- *Dental Prosthesis
- Implant-Supported
- Dental Stress Analysis
- Dental Veneers
- Gold Alloys
- Statistics
- Nonparametric
- Surface Properties
- Titanium
- Torque
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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