| 1. |
- Sennerby, Lars, 1960, et al.
(författare)
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Short-term clinical results of Nobel Diect implants: a retrospective multicentre analysis
- 2008
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Ingår i: Clinical Oral Implants Research. - : Wiley. - 1600-0501 .- 0905-7161. ; 19:3, s. 219-226
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: The present retrospective clinical study was undertaken to evaluate the survival rate and marginal bone conditions around Nobel Direct one-piece implants. The purpose was also to compare the results with when these implants are used for immediate/early loading with implants allowed to heal before loading. Material and methods: Forty-three consecutive patients previously treated with 117 Nobel Direct implants at four different centres were evaluated. The implants had been used in both jaws for treatment after loss of single and multiple teeth. Immediate/early loading (within 2 weeks) with a provisional crown/bridge was applied to 95 implants, while 22 implants healed unloaded for 6 weeks to 6 months before loading. Calculations of marginal bone loss were performed in radiographs taken at placement and after an average of 10.2 months (range 1–18 months) of loading. Results: Six (5.1%) of the 117 implants were removed during the follow up. All failed implants belonged to the immediate/early loading group giving a failure rate of 6.3% for this group and 0% for two-stage implants. The failure rate was higher for flapless (7.9%) than for flap surgery (0%). The marginal bone loss was −2.4 mm (SD 1.5) for all implants, while 37.6% showed more than 3 mm of loss during the follow up. Bone loss increased with time of follow up. Implants subjected to immediate/early loading showed more bone loss than two-stage implants: −2.6 mm (SD 1.5) vs. −1.6 mm (SD 1.1). Moreover, 41.3% of immediately loaded and 22.7% of two-stage implants presented with more than 3 mm of bone loss. Conclusions: This short-term retrospective analysis showed a poor clinical outcome of Nobel Direct implants. Extensive marginal bone loss (>3 mm) was found around more than 1/3 of the implants evaluated. Less resorption and no failures were experienced when implants were allowed to heal from 6 weeks to 6 months before occlusal loading. Within the limitations of the present study design, data indicate that immediate loading, the use of this implant for multi-unit constructions and flapless surgery are risk factors for failure of Nobel Direct implants.
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| 2. |
- Fornell, Jan, et al.
(författare)
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Flapless, CBCT-guided osteotome sinus floor elevation with simultaneous implant installation. I: radiographic examination and surgical technique. A prospective 1-year follow-up.
- 2012
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Ingår i: Clinical oral implants research. - : Wiley. - 1600-0501 .- 0905-7161. ; 23:1, s. 28-34
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Tidskriftsartikel (refereegranskat)abstract
- Background: Survival rates of implants placed in transalveolar sinus floor augmentation sites are comparable with those placed in non-augmented sites. Flapless implant surgery can minimize postoperative morbidity, alveolar bone resorption and crestal bone loss. The use of cone beam computerized tomography (CBCT) provides 3D presentations with reduced dose exposure. Objectives: To evaluate a flapless, CBCT-guided transalveolar sinus floor elevation technique with simultaneous implant installation. Material and methods: Fourteen consecutive patients in need of maxillary sinus floor augmentation were enrolled in this study. Preoperative CBCT with a titanium screwpost as an indicator at the intended implant position was used to visually guide the flapless surgical procedure. Twenty one implants all with a length of 10mm and a diameter of 4.1 and 4.8mm were inserted and followed clinically and with CBCT for 3, 6 and 12 months postoperatively. Intraoral radiographs were taken for comparison. All patients were provided with permanent prosthetic constructions 8-12 weeks after implant surgery. Results: Ten (47.6%) implants were inserted in residual bone of 2.6-4.9mm and 11 (52.3%) implants were inserted in residual bone of 5-8.9mm. No implants were lost after surgery and follow-up. There was no marginal bone loss during the follow-up verified by CBCT. The implants penetrated on average 4.4mm (SD 2.1mm) into the sinus cavity and the mean bone gain was 3mm (SD 2.1mm). Conclusion: Flapless transalveolar sinus lift procedures visually guided by preoperative CBCT can successfully be used to enable placement, successful healing and loading of one to three implants in residual bone height of 2.6-8.9mm. There was no marginal bone loss during the 3-12 months follow-up. To cite this article: Fornell J, Johansson L-Å, Bolin A, Isaksson S, Sennerby L. Flapless, CBCT-guided osteotome sinus floor elevation with simultaneous implant installation. I: radiographic examination and surgical technique. A prospective 1-year follow-up. Clin. Oral Impl. Res. xx, 2011; 000-000. doi: 10.1111/j.1600-0501.2010.02151.x.
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| 3. |
- Johansson, Lars-Åke, 1950, et al.
(författare)
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Bone Regeneration Using a Hollow Hydroxyapatite Space-Maintaining Device for Maxillary Sinus Floor Augmentation – A Clinical Pilot Study
- 2012
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Ingår i: Clinical implant dentistry and related research. - : Wiley. - 1708-8208 .- 1523-0899. ; 14:4, s. 575-584
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Tidskriftsartikel (refereegranskat)abstract
- ABSTRACT Background: The mere lifting of the maxillary sinus membrane by implants protruding into the sinus cavity allows the establishment of a void space for blood clot and new bone formation. Purpose: To evaluate bone formation by using a spherical, hollow, and perforated hydroxyapatite space-maintaining device (HSMD) in a two-stage sinus lift procedure where residual alveolar bone height was
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| 4. |
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| 5. |
- Slotte, Christer, 1954, et al.
(författare)
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Four-Millimeter Implants Supporting Fixed Partial Dental Prostheses in the Severely Resorbed Posterior Mandible: Two-Year Results.
- 2011
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Ingår i: Clinical implant dentistry and related research. - : Wiley. - 1708-8208 .- 1523-0899.
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Tidskriftsartikel (refereegranskat)abstract
- Background: Reduced alveolar bone volume complicates implant dentistry. Purpose: In this prospective multicenter study, a new, 4-mm long Straumann SLActive implant (Ø 4.1mm) supporting a fixed dental prosthesis (FDP) in the severely resorbed posterior mandible was evaluated for two years. Material and Methods: Thirty-two patients (11 men, 21 women; mean age 64.1 years) participated. Ten to 12 weeks after single-stage surgery, a screw-retained FDP was attached to three or four 4-mm implants. Results and Discussion: One hundred implants were inserted. Three failed at surgery and four were lost before loading. Twenty-eight patients received FDPs (93 implants). Two patients were discontinued because of secondary exclusion criteria; therefore, 26 patients were followed up from baseline (BL). After 1 year, one patient insisted on removal of all implants and one patient died because of nonstudy-related complications. Twenty-four patients (87 implants) were eligible for examination 2 years post-loading. All implants were found to be stable [survival rate 95.7% (confidence interval, CI 88.8-98.3) after 1 year and 92.3% (CI 84.5-96.2) after 2 years]. The mean change from BL to 12 months was - 0.43mm (CI 0.31-0.59; p<.001) and from 12 to 24 months - 0.11mm (CI -0.01-0.23; p=.056). The survival rate is only slightly lower than in similar studies on 6 to 8.5mm implants. This may be related to high initial stability and effective use of the residual bone volume with high primary bone-to-implant contact in dense bone structures. The surgical handling of the tested implant was found to be similar to that of implants of common length. However, the preparation procedure must be done with great care to avoid overdrilling. Careful planning and design of the prosthetic construction is mandatory to prevent unfavorable occlusion and avoid harmful shear forces. Conclusion: This study showed that 4mm implants can support an FDP in severely resorbed posterior mandibles for at least 2 years and with healthy peri-implant conditions.
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| 6. |
- Slotte, Christer, 1954, et al.
(författare)
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Four-Millimeter-Long Posterior-Mandible Implants: 5-Year Outcomes of a Prospective Multicenter Study.
- 2015
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Ingår i: Clinical implant dentistry and related research. - : Wiley. - 1708-8208 .- 1523-0899. ; 17:2
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Tidskriftsartikel (refereegranskat)abstract
- There is lack of evidence on long-term success of short dental implants in reduced alveolar bone. Purpose In this prospective 5-year study, survival and marginal bone loss of 4-mm implants, which supported fixed dental prostheses (FDPs) in severely resorbed posterior mandibles, were evaluated. Material and Methods In 28 patients, evaluation of 86 osseointegrated 4-mm-long implants, which supported a 3- or a 4-unit FDP by crown splinting without the use of pontics or cantilevers, was performed over a 5-year period. Results Three subjects dropped out for non-study reasons: one subject had her three implants removed after 1 year and two subjects died (six implants). Five implants in three subjects were lost between 3 and 5 years. Twenty-four subjects and 71 implants were active at the 5-year follow-up (92.2% survival). After 1 year, significant (p<.001) mean (standard error of the mean [SEM]) 0.44-mm (0.05) marginal bone loss occurred. At 2, 3, and 5 years, mean (SEM) bone loss of 0.57mm (0.06), 0.55mm (0.07), and 0.53mm (0.08) occurred, respectively (no significant change after 1 year). At 5 years, average plaque levels were 13.3%; 69% of the implants were plaque free. On average, mucosal bleeding occurred at 8.1% of the implants. During 5 years, two subjects experienced uncomplicated bridge loosening. No other complications occurred during the study. Conclusion Four-millimeter implants can support FDPs in severely resorbed posterior mandibles for 5 years with healthy peri-implant conditions.
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| 7. |
- Wälivaara, Dan-Åke, et al.
(författare)
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Frontal bone and modified zygomatic implants for retention of a nasal prosthesis: Surgical planning using a three-dimensional computer software program.
- 2011
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Ingår i: Journal of plastic surgery and hand surgery. - 2000-6764. ; 45:2, s. 109-12
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Tidskriftsartikel (refereegranskat)abstract
- Implants integrated into bone have revolutionised the retention of total nasal prostheses. However, it may be difficult to identify available sites for placement of the implant after excision. In addition, it is ideal to minimise wide bony exposure after radiotherapy to avoid compromising the blood supply. In this paper we describe a technique for accurate placement of frontal bone and customised zygomatic implants using a computer-designed and fabricated surgical guide with a minimal access flap.
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| 8. |
- Folkeson, Nicklas, 1981, et al.
(författare)
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Fireside corrosion of stainless and low alloyed steels in a waste-fired CFB boiler; The effect of adding sulphur to the fuel
- 2008
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Ingår i: Materials Science Forum. ; 595-598, s. 289-297
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Tidskriftsartikel (refereegranskat)abstract
- Corrosion field tests have been carried out in the superheater region of a commercial waste-fired 75MW CFBC boiler using air cooled probes. Exposure time was 24 and 1000 hours. The effect of adding sulphur to the fuel on the corrosion of two high alloyed steels and a low alloyed steel was studied. The fuel consisted of 50% household waste and 50% industrial waste. The exposed samples were analyzed by ESEM/EDX and XRD. Metal loss was determined after 1000 hours. Both materials suffered significant corrosion in the absence of sulphur addition and the addition of sulphur to the fuel reduced corrosion significantly. The rapid corrosion of the high alloyed steel in the absence of sulphur addition is caused by the destruction of the chromium-containing protective oxide by formation of calcium chromate. Adding sulphur to the fuel inhibited chromate formation and increased the sulphate/chloride ratio in the deposit. Iron(II) chloride formed on the low alloyed steel regardless of whether sulphur was added or not.
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| 9. |
- Johansson, Lars-Åke, 1950, et al.
(författare)
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Evaluation of bone regeneration after three different lateral sinus elevation procedures using micro-computed tomography of retrieved experimental implants and surrounding bone: a clinical, prospective, and randomized study.
- 2013
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Ingår i: The International journal of oral & maxillofacial implants. - : Quintessence Publishing. - 1942-4434 .- 0882-2786. ; 28:2, s. 579-86
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Tidskriftsartikel (refereegranskat)abstract
- To compare three different lateral sinus elevation procedures concerning new bone formation by using micro–computed tomography (micro-CT) of retrieved implants. Materials and Methods: Twenty-four consecutive partially dentate patients with a mean age of 64 years were included in the study and provided with 30 sinus elevation procedures. Three procedures for lateral sinus elevation were used: lateral sinus elevation with replacement of bone window and without bone graft (BW), lateral sinus elevation and covering osteotomy site with a collagen membrane and without bone graft (CM), and lateral sinus elevation with autogenous bone graft (ABG). Experimental implants were retrieved after 7 months of healing and analyzed by micro-CT. Results: One implant was found not to be integrated at the time of implant retrieval. This implant belonged to group CM and was excluded when calculating bone-to-implant contact (BIC) and intrasinus bone levels. The integrity of the lateral sinus bony wall was determined at the time of implant removal. In group ABG, all lateral sinus walls were ossified. In group BW, one lateral sinus wall was not completely ossified and in group CM, two lateral sinus walls. There were no statistical differences in %BIC between the groups: 93.5% (BW), 92.0% (CM) and 93.5% (ABG). Additionally, no statistical differences were found in apical intrasinus bone levels between the groups. When surfaces were compared within the same implant, a statistical difference was found between the apicobuccal distance and the apicolingual distance. The mean apicobuccal distances/apicolingual distances were 0.6 mm/1.2 mm for the BW group, 0.5 mm/0.8 mm for the CM group, and 0.6 mm/0.8 mm for the ABG group (P = .003). Conclusions: All three procedures were statistically equal when new bone formation was compared. Most of the examined implants’ apices were not covered with bone at the time of retrieval.
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| 10. |
- Johansson, Lars-Åke, 1950
(författare)
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On minimally invasive approaches to sinus lift procedures
- 2012
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Abstract Aims: The overall aim of the present thesis was to evaluate implant survival and bone regeneration after minimally invasive sinus lift procedures. Material and methods: In study I, 61 patients were prospectively evaluated 12 to 60 months after two different methods of locally bone harvesting methods adjacent to the maxillary sinus lift procedure. In study II, spherical, hollow, and perforated hydroxyapatite space-maintaining devices (HSMD) with a diameter of 12 mm were manufactured for this pilot study. Three patients with a residual bone height of 1–2 mm and in need of a sinus augmentation procedure prior to implant installation were selected for the study. In study III, 14 consecutive patients in need of maxillary sinus floor augmentation were included. Preoperative CBCT with titanium screwposts as indicators at the intended implant positions was used to visually guide the flapless surgical procedure. Twenty one implants all with a length of 10mm and a diameter of 4.1 and 4.8mm were inserted and followed clinically and with CBCT for 3, 6 and 12 months postoperatively. In study IV, 24 consecutive patients were included and provided with 30 sinus lift procedures. Three procedures for lateral sinus lift were used: Lateral sinus lift with replacement of bone window and without bone graft (BW), lateral sinus lift and covering osteotomy site with a collagen membrane and without bone graft (CM) and lateral sinus lift with autogenous bone graft (ABG). Experimental implants were retrieved after 7 months of healing and analyzed by micro-computed tomography (µCT). Results: In study I the survival rate of implants after a follow-up of 12 to 60 months was 98.8% using locally harvested bone grafts at the site of the maxillary sinus augmentation. There was no significant difference in marginal bone loss on the mesial and distal sides of the implant when baseline to 1-year registration was compared with baseline to final registration. During the same time, graft height decreased significantly on the distal apical side of the implants. A HSMD used in a two stage sinus lift procedure can produce a void for a blood clot and new bone formation and subsequent implant installation (study II). There was minimal marginal bone loss after flapless, CBCT-guided osteotome sinus floor elevation with simultaneous implant installation during the follow-up verified by CBCT. The implants penetrated on average 4.4mm (SD 2.1mm) into the sinus cavity and the mean bone gain was 3mm (SD 2.1mm) (study III). All three methods for lateral sinus lift surgery in study IV were equal when new intra sinus bone formation was compared using data from µCT. Implants apices were seldom covered with bone at the time of retrieval. Conclusions: Bone grafts can be locally harvested at the site of the maxillary sinus augmentation procedure to enable placement, successful healing, and loading of 1 to 3 implants (study I). A HSMD used in sinus lift procedures can produce a void for blood clot and new bone formation and subsequent implant installation (study II). Flapless transalveolar sinus lift procedures guided by preoperative CBCT can successfully be used to enable placement, successful healing and loading of one to three implants in residual bone height of 2.6–8.9mm. There was minimal marginal bone loss during the 3–12 months follow-up (study III). With regards to lateral sinus lift procedure, high degree of bone-to-implant contact was found regardless of the surgical technique utilized. With regards to lateral sinus wall formation only the autogenous Bone Graft (ABG) group consistently regenerated a completely ossified bony wall (study IV). Keywords: autogenous bone graft, bone formation, clinical study, cone beam computed tomography, dental implants, flapless surgery, hydroxyapatite, osteotome technique, partially dentate maxillae, sinus lift surgery ISBN 978-91-628-8520-5 http://hdl.handle.net/2077/30265 Correspondens: Maxillofacial Unit, Specialisttandvården, Plan 0, Halland Hospital, S-301 85 Halmstad, Sweden, e-mail: Lars-Ake.Johansson@regionhalland.se
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