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Sökning: WFRF:(Wennerberg Ann 1955 ) > Göteborgs universitet > Tidskriftsartikel > (2005-2009)

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  • Albrektsson, Tomas, 1945-, et al. (författare)
  • Oral Implant Surfaces 1
  • 2005
  • Ingår i: Perio & Implant Quarterly 2005. ; 1, s. 33-43
  • Tidskriftsartikel (refereegranskat)
  • Albrektsson, Tomas, 1945-, et al. (författare)
  • Oral Implant Surfaces 11
  • 2005
  • Ingår i: Perio & Implant Quarterly 2005. ; 2, s. 22-49
  • Tidskriftsartikel (refereegranskat)
  • Albrektsson, Tomas, 1945-, et al. (författare)
  • State of the art of oral implants
  • 2008
  • Ingår i: Peridontology 2000. - 1600-0757. ; 47:1, s. 15-26
  • Tidskriftsartikel (refereegranskat)abstract
    • Objectives: The aim of this prospective study was to evaluate the Nobel Direct® and Nobel Perfect® one-piece implants (OPIs) when used for immediate function. Material and methods: Forty-eight patients were provided with 115 OPIs for loading with a provisional crown or a bridge within 24 h and followed for at least 12 months with clinical and radiographic examinations. A group of 97 patients previously treated under identical conditions by the same team with 380 two-piece implants (TPIs) for immediate loading in the mandible and maxilla served as the reference group. Results: Six (5.2%) OPIs failed during the follow-up due to extensive bone loss. Five (1.3%) implants failed in the reference group. After 1 year, the mean marginal bone loss was 2.1 mm (SD 1.3) for OPIs and 0.8 mm (SD 1) for TPIs. 20% of OPIs showed more than 3 mm of bone loss compared with 0.6% for TPIs. When compensating for vertical placement depth, OPIs still showed a lower marginal bone level and thus more exposed threads than TPIs. Depending on the criteria used, the success rate for OPIs was 46.1% or 72.2% compared with 85% or 91.6% for TPIs. Conclusions: The Nobel Direct® and Nobel Perfect® OPIs show lower success rates and more bone resorption than TPIs after 1 year in function. Factors such as implant design, insertion depth, rough surface towards the mucosa, in situ preparation and immediate loading may have an influence on the clinical outcome.
  • Albrektsson, Tomas, 1945-, et al. (författare)
  • The impact of oral implants - past and future, 1966-2042
  • 2005
  • Ingår i: J Can Dent Assoc. - 1488-2159. ; 71:5
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper traces the history of oral implants, beginning with their early undocumented use in the mid-1960s. Although early experimentation with the Branemark system of osseointegration was unsuccessful, significant improvements and scrupulous documentation of the 1970s led to their general acceptance. George Zarb spearheaded their introduction into North America and application of the osseointegration technique soon expanded to extraoral craniofacial prostheses and bone-anchored hearing aids.New possibilities, such as altered surface properties and the use of implants in grafted and irradiated bone are currently being explored, although commercial pressure to introduce new products before they are adequately tested is a cause for concern.The future will see bioactive surfaces and additives that stimulate bone growth. In fact, with the possibility of in vivo growth of new teeth, implants may become unnecessary.
  • Andersson, M., et al. (författare)
  • Using optical tweezers for measuring the interaction forces between human bone cells and implant surfaces: System design and force calibration
  • 2007
  • Ingår i: Rev Sci Instrum. ; 78:7
  • Tidskriftsartikel (refereegranskat)abstract
    • Optical tweezers were used to study the interaction and attachment of human bone cells to various types of medical implant materials. Ideally, the implant should facilitate cell attachment and promote migration of the progenitor cells in order to decrease the healing time. It is therefore of interest, in a controlled manner, to be able to monitor the cell adhesion process. Results from such studies would help foresee the clinical outcome of integrating medical implants. The interactions between two primary cell culture models, human gingival fibroblasts and bone forming human osteoblast cells, and three different implant materials, glass, titanium, and hydroxyapatite, were studied. A novel type of optical tweezers, which has a newly designed quadrant detector and a powerful 3 W laser was constructed and force calibrated using two different methods: one method in which the stiffness of the optical trap was obtained by monitoring the phase lag between the trap and the moved object when imposing a forced oscillation on the trapped object and another method in which the maximum trapping force was derived from the critical velocity at which the object escapes the trap. Polystyrene beads as well as cells were utilized for the calibrations. This is the first time that cells have been used directly for these types of force calibrations and, hence, direct measurements of forces exerted on cells can be performed, thus avoiding the difficulties often encountered when translating the results obtained from cell measurements to the calibrations obtained with reference materials. This more straightforward approach represents an advantage in comparison to established methods.
  • Arvidsson, Anna, 1973-, et al. (författare)
  • Formation of calcium phosphates on titanium implants with four different bioactive surface preparations. An in vitro study
  • 2007
  • Ingår i: Journal of Materials Science-Materials in Medicine. - 0957-4530. ; 18:10, s. 1945-1954
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of the present study was to compare the nucleating and growing behaviour on four types of bioactive surfaces by using the simulated body fluid (SBF) model. Titanium discs were blasted and then prepared by alkali and heat treatment, anodic oxidation, fluoridation, or hydroxyapatite coating. The discs were immersed in SBF for 1, 2, 4 and 6 weeks. Calcium phosphates were found on all specimens, as analysed with scanning electron microscopy/energy dispersive X-ray analysis (SEM/EDX). After 1 and 2 weeks of SBF immersion more titanium was accessible with SEM/EDX on the blasted surfaces than the four bioactive surface types, indicating a difference in coverage by calcium phosphates. The Ca/P mean ratio of the surfaces was approximately 1.5 after 1 week, in contrast to the fluoridated specimens which displayed a Ca/P mean ratio of approximately 2. Powder X-ray diffraction (P-XRD) analyses showed the presence of hydroxyapatite on all types of surfaces after 4 and 6 weeks of immersion. The samples immersed for 6 weeks showed a higher degree of crystallinity than the samples immersed for 4 weeks. In conclusion, differences appeared at the early SBF immersion times of 1 and 2 weeks between controls and bioactive surface types, as well as between different bioactive surface types.
  • Arvidsson, Anna, 1973-, et al. (författare)
  • The role of functional parameters for topographical characterization of bone-anchored implants
  • 2006
  • Ingår i: Clin Implant Dent Relat Res. ; 8:2, s. 70-6
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: The surface topographical characterization of bone-anchored implants has been recommended to be based on amplitude, spatial, and hybrid parameters. There are also functional parameters that have the potential to describe characteristics important for a specific application. PURPOSE: The aim of the present study was to evaluate if parameters that have been described as functional in engineering applications are also relevant in the topographical characterization of bone-anchored implants. MATERIALS AND METHODS: The surface topography of threaded titanium implants with different surface roughness (S(a), S(ds), and S(dr)) was analyzed with an optical interferometer, and five candidating functional parameters (S(bi), S(ci), S(vi), S(m), and S(c)) were calculated. Examples of the same parameters for five commercially available dental implants were also calculated. Results The highest core fluid retention index (S(ci)) was displayed by the turned implants, followed by fixtures blasted with 250- and 25-microm particles, respectively. Fixtures blasted with 75-microm Al(2)O(3) particles displayed the lowest S(ci) value. This is the inverse order of the bone biological ranking based on earlier in vivo studies with the experimental surfaces included in the present study. CONCLUSION: A low core fluid retention index (S(ci)) seems favorable for bone-anchored implants. Therefore, it is suggested to include S(ci) to the set of topographical parameters for bone-anchored implants to possibly predict the biological outcome.
  • Edblad, Thorsten, et al. (författare)
  • Micro-topography of dental enamel and root cementum.
  • 2009
  • Ingår i: Swedish dental journal. - 0347-9994. ; 33:1, s. 41-8
  • Tidskriftsartikel (refereegranskat)abstract
    • The focus for the present study was to characterise dental enamel and cementum at the cervical region of healthy teeth by use of interferometry. The effect of a protein-dissolving enzyme, used for cleaning (Neutrase) on the surface topography, was also evaluated. Knowledge about the normal variation of surface topography of natural teeth is limited. In the design of artificial surfaces, intended to replace the function of lost biological surfaces, detailed knowledge of the latter is therefore of great importance. Nine health caries free premolars were used. The root cementum of three teeth was used for evaluation of Neutrase on the surface. On the six remaining teeth, the differences between the surface textures of enamel and root cementum were evaluated using 3D Interferometry. No statistical significant effect of Neutrase was identified. A significant difference between enamel and root cementum concerning surface topography using the different 3D parameters was recorded. When comparing values from the literature, the topography of artificial materials used in dentistry show similarities with the topography of the enamel and root cementum surfaces evaluated.
  • Eliasson, Alf, 1959-, et al. (författare)
  • A retrospective analysis of early and delayed loading of full-arch mandibular prostheses using three different implant systems: clinical results with up to 5 years of loading.
  • 2009
  • Ingår i: Clinical implant dentistry and related research. - 1708-8208. ; 11:2, s. 134-48
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Early loading of implant-supported prostheses in the edentulous mandible is widely accepted, but do the clinical results replicate those of delayed loading? Purpose: The aim of this study was to evaluate clinical outcome and patient satisfaction with early or delayed loading in patients treated with fixed prostheses, using three different implant systems. Materials and Methods: One hundred and nine consecutively treated patients received 490 implants supporting fixed prostheses; 82 patients with Brånemark System® implants (Nobel Biocare AB, Göteborg, Sweden), 16 with Astra Tech® implants (Astra Tech AB Dental Implant system, Mölndal, Sweden), and 11 with ITI® MonoType® implants (ITI Dental Implant System®, Institute Straumann AG, Waldenburg, Switzerland). Prostheses were placed within 2 to 3 weeks in 55 patients; 54 patients underwent a two-stage procedure. Data were collected from patient records and radiographs; 83 patients attended a clinical examination and received a questionnaire. Results: All patients had fixed prostheses at follow-up with a mean observation time of 3.5 years. Cumulative survival rates (CSRs) were 92.5% of prostheses and 94.4% of implants for early loading, and 98.0 and 97.9% for delayed loading. The mean radiographic bone loss after the first year was small, and at 5 years less than 0.2 mm for both groups. With early loading, significantly more prostheses (p < .05) needed adjustment or replacement. Conclusion: Statistically significantly more prostheses needed adjustment or replacement in the early group. The present study suggested lower CSRs for prostheses and implants in the early loading group after 5 years; the difference was not statistically significant. Larger study samples are needed to verify statistically small differences between treatment techniques.
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