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  • Ahlqvist, Jan, Birger, 1952-, et al. (författare)
  • Osseointegrated implants in edentulous jaws: a 2-year longitudinal study.
  • 1990
  • Ingår i: International Journal of Oral & Maxillofacial Implants. - 0882-2786. ; 5:2, s. 155-163
  • Tidskriftsartikel (refereegranskat)abstract
    • Osseointegrated implants in 50 edentulous jaws were studied during a 2-year observation period. The implant survival rate was 89% in the maxillae and 97% in the mandibles. The marginal bone loss averaged 1.7 mm in the maxillae and 1.1 mm in the mandibles. Most of this bone loss occurred during the first year. The bone loss was greater in jaws with a preoperatively minor resorption of the alveolar ridge than in those with moderate or advanced resorption. The bone loss was also greater at the medially positioned implants than at those more posterior.
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  • Akimoto, K, et al. (författare)
  • Evaluation of titanium implants placed into simulated extraction sockets : a study in dogs
  • 1999
  • Ingår i: International Journal of Oral & Maxillofacial Implants. - 0882-2786. ; 14:3, s. 351-360
  • Tidskriftsartikel (refereegranskat)abstract
    • The purpose of this study was to evaluate the effect of gap width on bone healing around implants placed into simulated extraction socket defects of varying widths in 10 mongrel dogs. All premolars were removed and the alveolar ridges were reduced to a width of 7 mm. Nine weeks later, a total of 80 implants, 10 mm long by 3.3 mm wide, were placed into osteotomy sites prepared to 3 different diameters in the coronal half, simulating extraction sockets. Three experimental sites, with gap sizes of 0.5 mm, 1.0 mm, and 1.4 mm, were created; the control sites had no gap. The depth of each defect was measured at the time of implant placement. All implants were stable at the time of placement. The dogs were euthanized 12 weeks after implant placement, and blocks containing the implants and adjacent bone were submitted for histologic evaluation. Clinically, all control and test sites healed, with complete bone fill in the defect. Percentages of bone-to-implant contact were measured histologically. As the gap widened, the amount of bone-to-implant contact decreased, and the point of the highest bone-to-implant contact shifted apically. These changes were statistically significant (P < .001). No statistically significant differences in bone-to-implant contact were found between the sites when the apical 4 mm of implants were compared. Within the limits of this study, the simulated extraction socket defects healed clinically, with complete bone fill, regardless of the initial gap size. However, the width of the gap at the time of implant placement had a significant impact on the histologic percentage and the height of bone-to-implant contact.
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6.
  • Bergendal, Birgitta, 1947-, et al. (författare)
  • Implant failure in young children with ectodermal dysplasia : a retrospective evaluation of use and outcome of dental implant treatment in children in Sweden
  • 2008
  • Ingår i: International Journal of Oral & Maxillofacial Implants. - Lombard, Illinois, USA : Quintessence Publishing Co, Inc. - 0882-2786. ; 23:3, s. 520-524
  • Tidskriftsartikel (refereegranskat)abstract
    • Purpose: This study surveyed dental implant treatment in children up to age 16 years in Sweden between 1985 and 2005, with special reference to young children with ectodermal dysplasia (ED) and anodontia in the lower jaw. Materials and Methods: A questionnaire was sent to Swedish specialist clinics in oral and maxillofacial surgery and prosthetic dentistry. Also, the teams who had treated children with ED were asked to submit their records for these children for a discussion on reasons for implant failure. Results: Six out of 30 specialist centers (20%) in Sweden had treated 26 children with dental implants between 1985 and 2005. Twenty-one patients had received 33 implants to replace teeth missing from nonsyndromic agenesis or trauma at ages 14 or 15 years; 2 (6.1%) of these implants were lost. Five children with ED received 14 implants at 5 to 12 years of age; 9 (64.3%) of these implants were lost before loading. Conclusions: Dental implant placement has been a rarely used treatment modality in Swedish children less than 16 years old in the last 20 years. The failure rate in children treated because of tooth agenesis was only slightly higher than that reported for adult individuals, whereas in young children with ED and anodontia in the mandible, implants seemed to present special challenges, and the failure rate was very high. The small jaw size and peroperative conditions, rather than ED per se, were thought to be the main risk factors. Centralizing implant operations in young children with ED and monitoring outcomes in implant registers are strongly advocated. Int J Oral Maxillofacial Implants 2008;23:520–524
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7.
  • Bergkvist, Göran, et al. (författare)
  • Bone Density at Implant Sites and Its Relationship to Assessment of Bone Quality and Treatment Outcome
  • 2010
  • Ingår i: INTERNATIONAL JOURNAL OF ORAL and MAXILLOFACIAL IMPLANTS. - Quintessence Publishing Co, Inc. - 0882-2786. ; 25:2, s. 321-328
  • Tidskriftsartikel (refereegranskat)abstract
    • Purpose: To investigate the relationship between bone mineral density (BMD) before implant placement, implant stability measures at implant placement, and marginal bone loss of immediately loaded implants after 1 year in situ. Materials and Methods: Consecutively recruited patients received Straumann SLActive implants loaded with fixed provisional prostheses within 24 hours. BMD was measured from computed tomographic images before implant placement. Alveolar bone quality was assessed during surgery. Implant stability-both rotational and as measured with resonance frequency analysis- and marginal bone height were assessed at implant placement and after 1 year. The Pearson correlation coefficient was used to calculate correlations, and significance was considered when P andlt; .05. Results: Twenty-one patients received 137 implants (87 in maxillae and 50 in mandibles). BMD was significantly correlated with bone quality classification in both arches (P andlt; .001). Mean BMD was also significantly correlated with stability values (P andlt; .001). Mean marginal bone loss at implant surfaces differed, but not significantly, at the 1-year follow-up, regardless of BMD values (P = .086) and measured stability (rotational stability P = .34, resonance frequency analysis P = .43) at implant placement. Conclusion: Within the limits of this study, it can be concluded that computed tomographic examination can be used as a preoperative method to assess jawbone density before implant placement, since density values correlate with prevailing methods of measuring implant stability. However, in the short time perspective of 1 year, there were no differences in survival rates or changes in marginal bone level between implants placed in bone tissue of different density.
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8.
  • Bergkvist, Göran, et al. (författare)
  • Immediately loaded implants supporting fixed prostheses in the edentulous maxilla : A preliminary clinical and radiologic report
  • 2005
  • Ingår i: International Journal of Oral & Maxillofacial Implants. - 0882-2786. ; 20:3, s. 399-405
  • Tidskriftsartikel (refereegranskat)abstract
    • Purpose: To evaluate the survival rate of immediately loaded ITI sand-blasted, large-grit, acid-etched (SLA) solid-screw dental implants in the edentulous maxilla after 8 months of loading. Materials and Methods: Twenty-eight patients (mean age 63 years) with edentulous maxillae each received 6 implants and 1 implant-supported fixed provisional prosthesis within 24 hours after surgery. After a mean healing time of 15 weeks, the patient received a definitive, screw-retained, implant-supported fixed prosthesis. A total of 168 implants were placed. Clinical parameters were registered after 1 month of loading with the implant-supported fixed prostheses as well as 8 months after implant place ment. Radiologic examinations and assessments were made at implant placement and after 8 months. Results: The mean marginal bone level at implant placement was 1.6 mm (range 0 to 5.1, SD 1.1) apical of the reference point (the implant shoulder). The mean marginal bone level at the 8-month follow-up was 3.2 mm (range 0.4 to 5.9, SD 1.1) apical of the reference point. Three implants failed during the healing period. Discussion: The improved results in the present study might be a result of the positive effect of splinting the implants immediately after placement Conclusion: ITI SLA solid-screw implants immediately loaded (ie, loaded within 24 hours of placement) and supporting fixed prostheses had successful survival rates after 8 months. The present results constitute a solid base line for future follow-up studies.
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9.
  • Bonfante, Estevam Augusto, et al. (författare)
  • Biomechanical testing of microblasted, acid-etched/microblasted, anodized, and discrete crystalline deposition surfaces : an experimental study in beagle dogs
  • 2013
  • Ingår i: International Journal of Oral Maxillofacial Implants. - Quintessence. - 0882-2786. ; 28:1, s. 136-42
  • Tidskriftsartikel (refereegranskat)abstract
    • PURPOSE: Modifications in implant surface topography and chemistry may alter the early bone response at different levels. This study characterized four implant surfaces and evaluated the biomechanical fixation and histologic response at early implantation times in a canine radius model. MATERIALS AND METHODS: External-hexagon Branemark-type implants were used with four experimental surfaces: microblasted (MI), acid-etched and microblasted (AAM), anodized (A), and discrete crystalline deposition (DCD). Surface topography was assessed by scanning electron microscopy, interferometry, and x-ray photoelectron spectroscopy. The implants were placed in the central region of the radii of eight beagle dogs and remained in vivo for 10 or 30 days. The implants were torqued to interface failure, and a general linear statistical model with torque as the dependent variable and implant surface and time in vivo as independent variables was used. RESULTS: All surfaces presented were textured, and different surface chemistries were observed. No significant differences between implant surfaces were observed for torque at 10 days. However, at 30 days, the AAM surface presented significantly higher torque values compared to the DCD and A surfaces. Significantly higher torque values were observed at 30 days compared to 10 days (P < .001). CONCLUSIONS: Significantly different biomechanical fixation dependent on surface preparation was observed after 30 days, and all surfaces were biocompatible and osteoconductive.
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